How To Set Up HEC-RAS Model From Raster DEM Using HEC-GeoRAS

hello there welcome to my youtube channel so today i'm going to show you how to develop a hacras model from dem data if you don't have any surveyed geometry for your reaver or any channel you don't have to be worried about that one anymore so today i'm going to show you that how to create your geometry and even the hackers model if you have any dem data and if you don't know how to download this dem data i have already demonstrated that one in my previous videos you can check my gis tutorial series as well so here it is we are working on that tutorial on heck gis so here is the location right that location is the over houston city so it is called san jacinto watershed or basin i'm working on this one for my gis tutorial so i'm just use okay i'm gonna use this one to extract or to export the geometry for hacras model for any section of a river or canal or channel so how can i do that at first we have to convert it if you don't have any gis software you can even download it i have already mentioned that one in my previous videos you can download for free and you can install that cracked version as well so i already demonstrated that one how to install gis software 10.8 version and in order to do that we'll use today the hex zeras the hex ers it is nothing but again it's a heck from hard logic in engineering center this software package you can download from this link i'll give you the link in the description below but this is only for gis 10.2 version but if your gis is 10.8 or 10.5 so how can you do that you have to have the same version of your hex urs and your gis software package then it will work otherwise it will give you a different error and you will not be able to generate anything okay so i'll give you also that link here is here i have the link i'll give you this link and you can even download anything 10.2 to the latest version 10.8 so okay since i'm gonna use the 10.8 version of arcgis and i have already demonstrated how to install that one in my previous videos and you can install it for free and you can click there and you can even download from here right you can download it once you are done you can just uh double click and next and next it will install and then you'll open arcgis if you already have then you can just right click here and you'll see a list of see heck grass right so at the very beginning it will be like that and you have to click and then you can see it's there okay before going to do that we'll use different options from there so at first i have to process my dem data so the dem data i have i already projected it into let me just show quickly if you don't watch my previous videos it is called estate plane coordinate system right and the vertical unit is also in feet and the horizontal unit is also in feet and i have the cell size 97.44 feet by 97.44 feet so my dem data basically it has both vertical and horizontal unit as fit okay so you can see on the lower right corner the coordinate it is showing as feet as well so at first i have to convert this dem data because it is in t pile right so usually dem data it has the dot tif extension so we have to convert it to tin okay so how can you do that when you'll install the gis starter packets for the first time you have to click their customize and then extensions and then you have to activate all of this 3d analyst okay and then all of this then you'll have access to 3d analyst tool here once you can just activate this one and then if you go to our toolbox you can find it there or you can even click there okay so i have here so now i'm gonna click on that i'm gonna expand it 3d analyst tool i can see conversion okay conversion so since it is a raster i'm going to convert from raster right from reactor to tin if i double click there you can see it is triangulated irregular network tin so in order to export or generate geometry or you know to use that hex 0s software package we have to convert the dem into tin so here i'm gonna just input raster it's dem feed the same name it's there and then i'll just convert it so the main t for this gis software package is whenever you do something new you should just create one separate folder and create one geodatabase and then you can do everything there then you'll have access in future and you can even send it to any other person they will even able to do the same thing so here is my default directory because i already created this directory inside my d drive and that is the name hecrass and grs and then that will be the name of the tim tin okay dem feet rested to teen and then if i click okay then it's gonna convert pretty quickly let's see if um successful then it will show different color and will work on that one see we're done with the generation of tin it's pretty simple right okay so i don't need dem so i'm gonna work only on that tin so i have many streams out of this one i'm going to select this simple straight one so at the very first moment i'm going to quickly show you how to create that haircross model if you have any single stream and then i'll show you how to connect the tributary and distributors okay for the first time the first trial or first case i'm gonna show you the simple one for a single reach of a reaver this portion okay only to demonstrate how to do that and then i'll do it again including that part because we have different options there we have to do separately so here it is now you have your hex0rs activated and you have access to there and click on that rest geometry and then we have to create different layers right here you can see the stream center line and bank lines and flow paths center lines and cross-sectional cut lines stream center line is basically the line that will follow the deeper path of the river means tall wake that is the stream center line and then bank line is the bank of the reefer and you can see here the white portion that will be the bank i'll show you how to do that and then only use this flow path center line it is also representing three different lines the main line should be the channel and we'll have two different flat planes it is just now a little bit longer than bank and then we'll have cross section these are the cross section we need so we'll do that we'll do two different ways manually and then automatic so in the first case i'll show you manually and then in the second case i'll connect distributories and distributories and then all length of the reverb will be long that's why minimal process will take time so i'll use automatic one okay so that's it first select stream center line that will represent reaver okay so before that what what that suggesting is to save the project and before saving the gis project what you need to do just use that store relative path name then it will just store that way and then it will be easy to open previous in future and if you even send it to another person they'll be able to send it and then save as okay save as your project there not here just i'm going back to my heck zeras no not is that one um so i have this one hecrass grass inside that one i'm gonna save my project okay which by the name zio res okay zeo res i'm saving it and now if i click there create rest layer and stream center line it's gonna show you the name of the river click just okay okay this is created it's showing the message and then create bank lines it's gonna create only the empty name right this is the only name we'll edit and we'll create that bank and reaver everything and here flow path center lines yeah just create that one it's this we have this and you can even create that create cart cross cross-sectional okay cut lines we're done with this one okay so what next here click on refer and then if you don't have this editor right right click and from here just click editor then you'll have access to editor here and from editor click start editing and then it will show another window here you can see your share files right all these chef files and lines these are the line shaft file these are activated so i'm going to click on reverb because i'm gonna and you can see i'm gonna just generate lines not rectangular circle ellipse or anything okay this should be line i'm going to zoom in i'm just zooming in and here i'm just selecting this one just draw a line following the center or the deeper part of your reefer or string that is the deeper because it's gonna represent that following okay i'm just doing it pretty quickly to show you how to do that and mostly you'll see this water mark so it is uh customary to follow that watermark that is the metallic this one right this blue light blue color you can see that is the deeper line and that's it okay i can stop here double click and then i'm done what you have to do because i'll extend this one later on well i'll show you the tributaries and distributors i'm showing it to me in a minimal process so here i'm just gonna stop editing and then save okay yes then what you have to do you have to click there okay assign refer code and rescore to reverse so if you just click on id then it and then click on that river line it's gonna ask you the name of the river i'm gonna give this main river okay if you have many then you have to give the name of the river okay i'm gonna give main reaver and then it's i'm gonna give the wrist name as creek okay in usa we call it creek if it is small stream then it's greek so i'm done with that one again edit and then this time i'm gonna edit bank line so which one or which are the bank line so for across model you have to be able to identify the left bank and right bank so since the river this river is flowing from upstream to downstream that is the office stream and that is the downstream so you have to look from office stream to downstream and you have to look from this one to this this direction then the left side right left side of your because you'll see the left side right it is the left bank and the right side will be the right bank so this is the left bank of this river and that is the right bank of the river so i'm gonna even start with the left band follow this line the white one that is the flat plane this will be our bank line and i'm just doing it pretty quickly to show you how to do that and after that i'll finish off here okay so i'm double clicking and i'm done and here for the right bank i have to do the same thing and then we have to do the same thing for flow path and then we have to assign the flow path as the left bank and right bank and the channel line so then the code on the software package will understand that okay this is my channel this is my left bank this is my right bank and then it will start calculating based on that so i'm done with editing banks then i'm stopping okay saving this one now i have to go to edit again and then this time it will be flow path and for flow path you have to draw three lines one line following the river line that will that will be the channel okay so how can i do that you can even click this way this way so we have another easy step here if you just click on and then click there and if you just move your mouse automatically it will trace okay it's pretty amazing okay and then i'm done double click so it's following the refer line and then i have to draw to a different line so in order to do that don't activate the trace again click on that straight segment and then follow another line that will be away from let's create a little offset from the left bank and create that flow path okay so for flow path we'll have three different lines one will follow the following or the main stream and another two that will be a little bit away from our bank line because the software package will understand the bank line at the same time it will depend on the flow path so i'm going to show you that one so we are done with this so staff editing click yes okay so here it is we are done with signing our stream id right and then we are going to this one select flow path and assign line type attribute so if you click there see the string three line the the middle line that will be the channel so you have to click right on the middle line on the river line and then from the drop down menu select channel so okay so that is so we assigned okay this is my channel and that one click there and that is the left bank right assign that as left bank and then assign that as right bank and then it will understand okay i have channel i have left bank or right bank that means you will understand that okay i have the flow from upstream to downstream so now it's time to generate our cross-sectional cut line right so we have to do the same thing if you do the manual way and after that i'll show you the automatic way and here start editing this time i'm going to create click on cross section access cut line and then you have to remember that everything should be from left to right from left back to right back and cross section should be perpendicular to the main channel so this is the left bank you have to and it should cross every lines okay every line so here from left to right double click finish and then from left to right and you can do as many you want and double click okay and then here is another one just double click and then double click double click and then i'm gonna finish up here i'm done with this okay and then i'm gonna start editing saving it one more time so i'm done now what i have to do i have to start the processing the remaining processing i need here go to rest geometry and then we're done with creating rest layers right then here stream center line it reviewed you can click one by one or you can click all it will do this processing topology length and stations from one station to another one and then elevation it will do everything then i'm clicking all if everything is okay so see the stream center line is the reaver right the reaver we edited and then it will take the information from this train that tin and then it will give the name as river 3d because it will have a three-dimensional data right or you can change this name as your which that is not a problem i'm just giving it as it is clicking okay if everything is okay it will show you successfully done so we're done right so we have the most important part now that is that cross sectional cut line attribute you can even start one by one or you can even click all to do all this processing again you have to assign your reverse center line that is the reaver and bank line see here it is using the bank line and then flow path here is the flow path we have three lines and cross sectional cut lines we already have that cross sectional cut lines right and it will also use that t i n and it will give you this name 3d cross sectional card line 3d and now if everything is okay then it will work otherwise so it's done okay so process is done now we can see the cross section if you click there if you wanna see the plot of the cross section just click there and then click on any section you see we have the cross section right and we can see the same cross section while importing this into our across model see we have this cross section so we are done with generating our cross section and our bank line everything and if you want we have other options as well you can even generate meanings roughness from here and in order to do that you have to have land use information and you have to have that table and then you can assign that one so we can do it easily in our across interface right we can do that and if you can even uh create that levee is another thing in future tutorial i'll use i'll show that how to do that and breeze and other structure i already have demonstrated this this one how to import breeze and how to calculate breeze's color i already have that video if you want to you can watch that and i'm done with that that one so now it's time to export rest data okay so click on that export rest data and see here is gonna show you the same default right that default directory we have and you can you can change the directory if you wish i'm not gonna change it because that's why i generated or created new right a new uh folder and i'm just saving everything there if i click ok and everything is if everything is okay then it will show that it exported successfully okay and then we can see it's done and now we're done with this one so what i'm gonna do i'm gonna even show you how to import this into our hec-ras model so in order to do that we have to create a new right project and i'm gonna direct to that folder as well and here is the folder zis and that should be heck across hecrass grass inside that one i'm going to give this name as heck grass okay heck or heck duress heck geores new creek that is name of the creek and then i'm clicking okay so it's gonna show you okay what will be the unit for this case it will be us customary unit okay we have that unit because yes customary means it is in a feed and now what you have to do you have to open that geometry and then you have to go to file and then because the geometry we generated it is the gis format right so gis format and then see it will show you this sdf file if you select that one and then click ok so it's gonna ask you again what is the unit of that file it is also us customary unit right and if you click next and then click next and it's gonna show you everything the cross section number everything and then finished import data so see here you can see we have that geometry and that is the office stream and it is going to show the flow direction right and if you want to see the cross section here we have the cross section see we have the cross section and you can see one by one you can see every cross section if you want see and you can do the processing so this is how if you have any one single stream or channel and if you have very accurate dm data you don't need to just hire any survey company to serve your entire river that is pretty costly right and i already demonstrated how to import survey data to generate uh geometry for hacras model in my other videos if you want you can watch that as well so i'm done with this one and if i want to even run the model i can assign my condition right and now since i just imported it i have to even save it right i have to save the geometry as i'll do that after generating another set of data from this same dem that's what i need so i'm just done with generating the simple one okay i'm closing this one okay and finishing this one so here it is now i'm gonna extend it and i'm gonna consider then i'll run the model so i'll consider this a tributary right okay i'm considering this one as my main channel and i'll start from this one it will be pretty long and i'll stop here and i'll consider this one as my branch then that is the reality and if you want you can add this one so i'm just doing for another one so in order to do that i'm gonna delete or remove everything i have here okay and now what i have to do have to do the processing and this time i'll use my automatic delineation of cross section that will reduce our time but for stream signal line it will because since we already have that so it is asking if it is gonna remove or not okay remove it and rename the same thing we have the reaver we have to do the same thing bank lines it's going to ask the same thing clear and generate another one because i'm doing the same thing on the same right file or folder then flow path center line okay remove and create another one and finally i have to do that cross sectional cut lines okay and clear and generate that now i'm done so i'm gonna zoom in because this time it will be pretty accurate okay so that's why i'll zoom in and zoom out all the time here it is start but you have to follow specific rule here okay start editing and then create feature that will be rever and i'm following this line from here okay this one so this time i'm just doing it pretty seriously because i'll run the model and i'll run the model not for actual data i'll just run the model because i already demonstrated how to generate 100 year 50 year and 25 year of flood event and i have done everything in my previous videos you have to go back and you have to check how do i do that and for this time i'll only show you how to run the model if it works or not okay if it's gonna work or not then you'll see that everything is possible if you don't have any geometry data you can even create one and if you have your survey data you can use that one as well so here it is i'm just following i'm trying to follow the following the deeper line right for concave bank because this is pretty mean ring creek and it's pretty long so you have to follow that you will have the deeper line of the depth is differ right where in the outer bank right and then you'll have shallow depth in the inner bank and i'm almost done so here is the thing you have to remember when you will have the confluence there so i'm just waiting to show you that here we have pretty accurate depth of the river i'm still following so here it is we have to finish i can continue see the main channel is going this way but i'm not gonna do that because we have the confluence and the model on the software should know that right we have to inform the software that okay this is my confluence here so i'm gonna stop right i'm gonna double click and stop and now at first i'm gonna just finish up with my main channel then i'll start with bank line okay so here it is i'm just starting from this segment so here it is channel for this one because you have to specify the junction otherwise the model or understand that that's why we have to do it part by part and we have to specify okay this is my junction so how can you do that that's why i'm just doing it once again because you may have this type of right issue in your real world modeling if you have only one straight segment of a river then you can follow only that simple step or if you have complex river network then you have to follow this one as well yeah i could do that in a single video but i'm just making it separate so that you can understand for two different cases what i'll do i have to select this point okay how can i do that i'm not because it is already selected right it's already selected but i have to right click and then snap to feature and then select the vertex then it will automatically select right it will select the vertex and it's pretty accurate then you have to finish scales then we are done with this one so we have two different segment of stream so that is the confluence now i have to start from this one how can i do that just right click and then selecting vertex it is gonna start from this one yeah we have the second or the downstream part of our main channel okay so follow this blue line that is the deeper part of a reaver and follow it so that's why it is necessary to see all these steps so in order to get that vertex what you have to do you have to just turn on your snapping tool if you just turn on the snapping tool then it will automatically show you that options you need so still i'm following this one so this is kind of real-world case that's why so how to download dem data how to project dm data i have all this information in my gis tutorial you can see i have a lot of videos there and you can even download that gis software for free because that is that this software is not free for all but i have the correct version and i have already uploaded this one for you so that you can practice more and you can learn more so i'm gonna finish off here because it is all the same right if i can continue because i don't have anything so i'm gonna finish off here before getting another branch so double click and it's done okay so i'm gonna save this and then we have three different segment see it's pretty big area right pretty big it's kind of real-world case so edit and then stop editing i'm gonna save it and now it's time to assign our review variety and click on that one so this will be our main right main river main river and that will be the office stream reach of the stream which i'm just giving this way of stream reach and that is separate from other parts so that is the tributary so before going to do that i'm clicking there oh wait so you have to you have to click exactly on the river okay then it's gonna select so select that main reverb that is downstream reach if you have the name of the river or segment of the river because if you have a big river then it has different rich different segment of a river usually people call it in a different name so i'm done with first part second part and then we have this tributary i'm gonna click on that and it it is different okay distributory tree view sorry okay and then that is the rich or creek creek a new creek or anything there is the creek okay so yeah we are done with three segment of our streams that is the office stream of my main channel or main reaver that is the downstream from the confluence and we have another tributary okay so we'll run the model so we'll have one flow rate here we'll just assign a specific flow rate and another flow rate there and we'll have a water level boundary condition there and we'll run the model and we'll see if we have any any problem or not definitely will be successful okay so we're done with assigning this one now um okay i already said that so start editing again and this time it will be banks right okay it's gonna be the bank so for bank you have to follow the same rule same thing see we have pretty big segment of the reaver i'm gonna zoom in there so it's gonna take a while so follow that line pretty quickly and then we have to that's why you have to follow this specific guideline to be successful and here it is just follow this white line because that is the flood plain for sure there so we need to generate because in the dem data we even can't identify that's why we need that triangulated irregular network to identify our bed level or bathymetry data so to survey this length of river it will cost a lot so we don't need that anymore because people are trying to generate this topographic data set from different sources so lighter data is the most accurate data and it has like less than one meter resolution but this data has 90 feet or 30 almost 30 meter resolution and we also had that i could download that one 10 meter but i didn't because it will just take a lot of time i already mentioned that in my previous videos and i already provided the link if you want you can do that so i'm going to finish up here see that is the bank of my upstream reach of the main reefer double click and i'm done okay and then i'm gonna even do the that is the left bank you already have id about left bank so we have to even sign the left and right bank separately so i'm gonna do the same thing for the right bank as well and that is why see so i'm falling even though it has a different tributaries and distributors but i'm not gonna consider that one today because it will take a lot of time and even i'm gonna make it simple as possible here it is if you have high resolution data because the lighter data that was that i was talking about it is basically you can find like one meter resolution for some part of us and then you can even use that because i already used that in my other model del 3d model for flared modeling that needs very specific or very high resolution data to resolve small streams but for hacras model if you just want to run the model for a breeze covering or any other thing you don't need that high resolution data but if you have then it's it's good and see i have to even stop here because i'm done with the upstream part of my right bank double click and i'm done and now i have to do the same thing for that stream right so that is what we are gonna do right now so okay for the right bank because still now it doesn't have any idea about left bank or right bank unless i assign it okay so that's why it doesn't matter if you start this way or that way when i'll assign okay that is my left flow path line that is the right then it will understand okay this is my left back and this is my right back here it is see again you have to use the same thing when it is just snapping right click snap to feature vertex right and then other than double clicking right click and finish sketch so we have that again start from there so this is how this is sometimes time consuming and library as you may feel and sometimes it may even work if you just try to export if you try to even use automatic so you need to have passions and you have to do the same thing over and over but the good news is that if you have problem while doing all this processing then you'll learn new thing so i'm gonna finish off here right double click and finish and now i'm going to start from this one so what i have to do i have to select the vertex right click snap to vertex and then it's going to select vertex because that is the right bank of my downstream segment right of the main channel so here it is i'm pretty quickly digitizing that right then the lower part of my main channel and zoom out because it's not gonna be very long right yeah so in this window i can finish off so here it is just follow this white line as you can but you have to even capture all this bend pretty smoothly right i'm done and now i have to do the same processing there click there right click snap to right vertex we have the vertex and then follow the bank of the reaver pretty quickly but for your actual reachers or any project just do it pretty carefully otherwise your simulation may be wrong or maybe there will be some error and if you do the same thing over and over then you'll have experience on that and you'll know how to solve the problem so now i'm done with the bank line and then see stop editing i'm done with that one now it's time to start editing that flow path right so flow path so clicking there and now what i have to do i have to even do the same thing for the channel right so in order to do that i'm going to activate that trace the trace because i'm going to trace my main channel right this way this way it's pretty simple simple i'm going to trace that and then okay okay it is pretty long i have to zoom in and then okay so i'm here following this one this one this one i'm gonna stop here okay double clicking and i'm gonna stop yes and then what you have to do you have to do the same thing for this one you can follow and you can dress it there okay just follow this one and then press it and when you are done just here double click okay so we're done and then again select okay we we selected then we are just tracing tracing tracing and then we're done here right double click so we're done with our channel then because this is flow path so we have to do the same thing for so i'm gonna turn it off and then straight segment i'm turning that on and here it is just follow this previous rule i mentioned for the left bank and right bank this is the flow path that should be pretty close to our bank line so that our cross-section automatic cross-section will follow this line because that would consider this line pretty close to our bank even what you can do you can even superimpose your flow path line over your left or right bank but that is not customary people yeah don't size that one and then you can use your trace tool to just quickly follow live right generate your flow path because in order to use that stress tool you need to have the line right beforehand then it will follow any line any shapefile or anything and if you have your bank line already digitized for any region then you can use those i'm going to finish off here okay because i'll use the flow path line for the tributary okay i'm gonna start here right so this is the see in order to exclude any of company to survey the river we can take this hassle right okay okay see i made mistake here so what i have to do i have to delete it because it shouldn't toss that line okay it shouldn't toss the line there is no way okay control z because that already selected okay i'm gonna just delete this case okay this one so i'm gonna start off here starting over and then following there so you have to be very careful and zoom in this time so that you can even follow the line and make an offset just maintain this distance so that it can't toss and you can even change the snapping distance the peak gel that is also possible you can go to snap tool and then you can change the then it will it on touch so it is checking the distance between these two lines and then it's automatically selecting the nearest point so that was the mistake but that is also useful to identify your ending point or starting point so that's it and that is the right flow path line for the office stream of my main reaver or channel so here i'm gonna finish off so that is done up to there okay double clicking here it is now i'm gonna do the same thing for this part and starting from this one okay so here it is and i'll do the same thing that i have done for channel for bank so this is the protocol you have to maintain here let's right click find the vertex and right click and finish cash okay and here for the left bank the flow path will follow the left bank and just follow this way and maintain an offset uniform offset and smoothly just try to cover every bend and then finish off here okay double click and that is the flow path for the tributary now we have to do the same thing for this one so right click and find the verdicts so this is how that is just making it separate right because the software package will understand that you have different reach of your river otherwise it will consider only one and you won't be able to even assign different flow condition different name because that is the rule you have to follow and if you just uh practice several times you can even remember every processing and i'm gonna finish off here okay double click and done now i'm gonna select this point just right click snap and vertex zooming in and then just following this okay line and then we'll use our automatic sometimes it is i don't know but it may be going to show some error then we have to even remove all these errors and you need to know that on the string separately otherwise the previous one pretty simple right it was only for a segment of a reader and i'm done okay what i have to do now i have to just edit and start editing and then i'm gonna save it okay i'm done that and then you can set the project as well okay now it's time to assign which one is our channel which one is our bank or stream right so click there select flow path and assign line type so that one you mean that is see here that is the channel that is the channel right and that is the left bank right consider that that is the left bank and here it is the right bank right yeah see when i'm clicking there see it is not selecting everything right it's selecting only the part see only part of the segment so that's why we divided it okay so that is the channel that is i'm selecting the flow path that is the left bank and that is the right bank and now we have to select the down see and there is the main channel and that is the left bank for that one and that is the right okay so you didn't toss that so that is the right flow path or bank okay so now we are done with everything we assigned our stream id we are just we assigned our channel types and the line types everything is done now go to geometry and then there stream streamline attribute and click all if everything is okay so it's gonna give you everything okay previously we have this river 3d it's gonna clear first and then it's gonna save everything successfully okay it's done but before doing that what we have to do before doing that we should do our cross section right it's the time to generate the cross section here if you click there cross section construct cross section cut lines so here it is okay so before doing that what do we have to do you have to measure the width of the river so that's why you have to assign the width right what will be the width of the cross-section and then what will be the interval of the cross sections how can you measure that since you're using gis go to there the ruler and you can select there as the distance as feet by default is feet and then you can select there or the maximum distance could be this fit 15 right or 1600 feet the width of the river could be 1600 feet okay then we can do that so again click there i'm gonna just showing you the entire view of the study area and then clicking there and that is the cross-section cut lines and we have the river as standard line and the interval should be 1000 and then it should be 1600 okay 1600 or you can use 2000 whatever it is but this is the way and then the cross rule of the thing the rule is your cross section shouldn't be cross right it shouldn't touch any other cross section that's why you have to use a fair amount of length so if i use this one it's going to show you the interval c we have this cross section this is just a matter of one click but see we have some problem there can you see that these are the problems we have here see this is crossing in a separate way so we shouldn't do that how can we remove so we can edit so that is the cross sectional cut line we can start editing that one and then it will be cross sectional cut line this one i'm just selecting this one okay and then you can even delete you can click there and you can select it even you can delete it and you can select this one i'm gonna delete it i'm gonna delete this one because these are not accurate one okay so this is the demerit of using this one so if i select this one i can even drag and i can fix it but this one i can even uh okay let's try with this one maybe um yeah this is good but let's try to fix this one see now this is not touching okay what what is this one okay you have to even cover this lines and then okay check this is the error we have to fix manually and if it is necessary you can delete this one you can use you can just replace the location and you can even delete this one as well this one as well and fix the covers okay and if it is necessary we can even delete other okay we have a little problem there right so these are the correction you have to take care by dragging and that's why i checked the length okay length of the reaver this one i'm gonna delete this one it's gonna touch every line this one i have to save so it's better sometimes if your study right area is not that big and if your length of the reaver is not that long you can just use minimal process that that is pretty simple right and useful from my understanding see for any straight reaver and if you have bend so we have the problem in the bend here because it's trying to generate the cross section following that perpendicular line but sometimes it can't identify the algorithm can't do that i'm gonna delete that okay the rule is it has to cover every line especially that flow path line then it will generate the cross section otherwise it won't so here we have some massacre i'm gonna delete this line and this line as well otherwise everything looks pretty maybe this one as well okay i don't know if it is going to cover maybe no it's not gonna cover okay i'm gonna delete this one okay so it's okay this one is okay and we have travel there i'm gonna delete this one and this one as well and of course this one and let's try to fix this one if it is possible okay let's try to fix one more time maybe i'm gonna delete this one and okay so this is one way to fix and we have seen different issues here maybe i have to delete many so i'm dragging there i'm gonna delete this one i'm gonna select this one and delete and for this one and dragging and fixing the length we have to delete this one or try to fix it maybe it's gonna cover not and i'm not sure maybe yes okay so here it is i'm gonna delete and i'm gonna try to fix this one as well it's okay this is okay maybe this is not okay to delete that one maybe this is not okay we have to delete this one as well and here it is maybe we can try to fix that this is okay so this could be also okay if i just drag it a little bit maybe this is also good okay so we are almost done and we can even insert if we want some other stations i'm not gonna do that right now and you can even insert other stations and i'm not sure if it's going to work or not right so these are the problem we have to do you have to follow that no two cross section okay two cross sections are not allowed to cross or touch but it has to even cross this flow path and then you'll be done so we have to do the processing one more time so here topology and everything all and then again it is going to do the same thing successfully bullets done the most important and problematic part is this one if everything is okay then it's gonna create everything so reverb bang flow path cross sectional cut line dm and then it's gonna be this one okay and let's see if everything is okay then it's gonna create maybe hopefully it's gonna work see it's it worked so we are successful right so what we have to do we have to go to our export rest data and by default it is there if i click ok so it will replace the previous one okay i want that see if it is successful sometimes everything is okay and after that while exporting this one it may not be successful that's why you need to create a separate folder this time we're done okay we're lucky so i'm going to set this and i'm done now let's try to finish off my hacras project we are done with our new okay so now i'm just gonna replace this one because it is not gonna exist anymore and gis data okay this one and hopefully this is gonna be this one right clicking okay customary and everything should be okay finished let's see we have this one right so we also have our previous one so i'm gonna remove this one and even if it is necessary i'm gonna even open a new project okay new project and i'm not gonna save it and okay it's gonna open no no i'm not gonna open that okay i'm not gonna open open that i'm gonna create a new project create new project do you want to save no and then the project name should be a little bit different than just creek okay tributary now main river main main river and then it's okay we have this and then open the geometry and then i'll use a default value or some value or any arbitrary value of my flow condition and then i'll run it for a steady condition and you can run because i have the previous tutorial how to run the model for steady condition and unsteady condition as well right so gis format this is one we need and here it is here it is finish okay we have see it's pretty simple right and it it looks good we have the flood reaction main reverse it is even giving you the name and that is the flow direction and that is the tributary flood reaction there is the main channel downstream so that is the office stream you can check the cross section right the first cross section and you can select main reaver you can select tributary it's gonna show you that way this way you can check if your cross sections are okay or not and even you can interpolate between cross section as well that is the main river and you can check you can see many cross sections so if you have longer length and if you see select the downstream it's going to show the downstream c this one and this one so the number 1000 it is the downstream cross section where we'll have our water level boundary right water level boundary and here the 5a triple zero that is the office stream of our main reaver and we have 15 000 right that is the office stream of our tributary so we'll use that information so i'm going to save my geometry save geometry as because we just imported the geometry but we have to save it geometry okay geometry and then it's there now what we have to do we have to even generate our steady flow condition go to edit and then as before because i have already demonstrated that one right so edit steady flow data so here we can see we have that office stream section here right we can even import that will be our 10 000 okay 10 000 cfs and we have main reaver right downstream we don't need anything but tributary the 15 000 that is the office stream right we also have like 5000 here and here the downstream part you can even use another one uh that is kind of uh 3000 okay we have 3000 cfs we're done then this is the flow like for example if you have your 100 year flood plane you can do that right i already demonstrated that one 100 year 50 year and 25 year how to do that how to generate how to change the name right edit profile name i already did it for example this is 100 year 100 year okay this 100 year of flow rate data and now we have to even assign our downstream boundary condition the downstream boundary condition will be water level i'm gonna just assign any specific data so how to do that right if you need to change anything you can do that and here click on that reach boundary condition in here we have this junction see this is the junction number two so we have to assign these values there and we have our known water level okay non-water level we have the junction junction this is junction 2 there there and here main downstream there we have to assign at the very last moment so the known water level that is the water level i'm going to give for example i have the water level as like 15 feet okay that's it i don't know but i'm just assigning these values let's see if i'm okay or not because i don't have any idea i'm just giving arbitrary to run the model so i'm done with that one i have to save the flow data right say flow data so this is basically flow okay steady flow steady flow because i'm just assigning one steady flow means if the flow condition like flow rate water level or velocity remains constant with respect to time then the flow will be steady otherwise it will be on a steady flow if the water level flow rate right change with respect to time then that is called honest ready flow for example if you have a time series data for one month or for one year and you are going to run the model then you will have to assign on a steady flow and i already demonstrated that one how to generate flow condition that is steady or understated whatever it is in my previous videos you can check that and i'm done with that flow condition right i'm going to close that now i have to go to run and that steady flow analysis and here right it will be soft critical flow and then you have to assign your geometry there if you have because i already demonstrated how to select different alternative flood planes in my previous videos i can use different geometries different base condition different peer condition so i'm already done with this one if you are interested you can go back and check so here i'm just running for the condition that i have right the main objective of this tutorial is to generate the cross-sectional data from dem others are not optional that's why i'm not gonna change any condition there so what i have to do i have to save the plan okay save the plan just round one and i have to give the condition as like okay plan one okay plan one then if i hit but before that i can even use that flow distribution locations there as 8 and here as 8 then we can see the velocity profile separately so i'm just saving the plane again if i run and if everything is okay then it is going to run okay otherwise it's going to show this error that error you have to solve this error what is oh we don't have the meanings value right see that is the problem because we didn't assign the meanings value so in my geometry what we have to do here we have to assign the meanings value and we already have idea how to assign meanings value right so you have to go to tools or tables there and meanings the value and select this okay select the main reaver first main reaver and or you can select all the reach you want and select the values this one okay and then it's gonna select everything so set the value that will be 0.0 uh for example three five okay or [Music] two five i'm just gonna assign the default value and this one this should be for the middle i mean the main channel so that should be 0.0 because that is pretty smooth and bank is pretty rough that is going to be 0.020 and then i have this for the right bank that is going to be 0.03 0.025 right same for left and right bank so i'm done with everything okay just save and if you want to check it you can check see now it's it's populated with meanings roughness and it's gonna see for every section we have the same value now i have to save the geometry one more time and then i have to run it if everything is okay then it's gonna run otherwise it's gonna show another error let's see we have creek no meanings oh we i haven't specified the meanings roughness for the tributary okay so we have to select office team i'm done with have a stream i have to do the same thing for downstream of the main channel we are done with that one but for tributary we have to select it separately and i have to assign the same value 0.025 so this is good that okay if you have any error it will give you the error and then you can read it and you can there will be 0.020 and we can fix it so that is the tool you can even assign or the default value is pretty quickly 0.025 for the right bank as well so we are done with this one and then i'm gonna save that again and then this time i'm hoping it's gonna run okay let's see yeah it's gonna run see we're pretty successful right it's pretty amazing that okay we started the model from our dem data while it i think it didn't take that much time from the express i just generated the model from scratch right and let's see the results okay if i click there you can see the result the flow condition because the flow condition i use it is not that high that's why it's this one okay this one this one and okay one more time i'm gonna change the flow condition to show you that so that you can understand so instead of ten thousand i'm gonna use like thirty thousand okay and instead of three thousand i'm gonna use that as ten thousand and instead of five thousand i'm gonna use that as twenty thousand okay and let's see apply data and the downstream boundary condition that should be known water level but not so that should be 25 and let's see here we'll have definitely our flow rate and everything saving this flow data okay and i'm gonna run the model because we are done with model run now i'm gonna run it see this time you'll see higher flow rate and everything there see it's gonna give you this one okay so that is the floor you can see here and if you wanna i can see everything from the main window you can't even check that here you can see there the velocity distribution here see we have the velocity seven feet per second so this is how we can even specify right how do because i already demonstrated that one in my previous videos how to calculate that flow condition right for 100 year 50 you can check that and i just demonstrated this one only for the sake of running this model okay and if you want to even see the three-dimensional flow profile you can even check that one as well from here you can see the long profile here and if you can because i already have demonstrated this one for different flow conditions and here from view perspective plot you can see the perspective plot this way right you can this is from office stream or downstream and you can even change anything okay we can even start from beginning to the end and okay and if you wanna even select different values for example cross section and if you select the main reaver an office stream reach or okay after stream reach then you can see from the perspective plot it's gonna show that one as well it's a 3d perspective plot see this is for office stream you can see that and you can even rotate that one right this is the thing we already have done previously you can see you can rotate it you can see that okay is it there see we have a drop of water level because that is pretty sharp right and we can interval it i already demonstrated that one in my previous videos if you need to interpolate in between two sections or even interval between or in a within a reach then it is possible to do that okay so that's it i'm not going to even um take more time to make it longer so that's it if you have any dem data you can use hex geo res to develop your hacras model and then you are done and you can even insert any breeze in right anywhere if you want so that's it so i'm going to finish up here and if you have any query or question i'll give you the link in the description below how to download that hex grass for any version of your heck uh gis software package right and then you can practice by yourself and that's it thank you very much for watching and thank you for supporting my youtube channel and if you have any query you can or any suggestion you can provide that one or if you have any requirement or if you even wanna uh ask that okay if if i need to show this thing or that thing in my future videos you can yeah you are welcome to mention that one as well because other people have already mentioned that one and based on that necessary or necessity i already created some videos and uploaded that one because i can't help an individual student one by one but i'll try to generate videos so that other people or many people they can be benefited from this one so thank you very much once again and stay safe bye

Channel: Md Arifur Rahmahn

Views: 660

Keywords: hec-ras, gec-georas, 1D hec-ras model, steady model, unsteady model, #HECRASModelSetUp

Id: Pij49Z7Cj3M

Length: 69min 10sec (4150 seconds)

Published: Sat Oct 02 2021