HEC-RAS Basics Part 7 of 8: Culverts and Hydraulic Structures

hi I'm Craig price with surface water solutions welcome to our next video in the series on what's new in Jerez 5.0 for in this video we're going to cover the new culvert options and why we no longer need wormhole colors so let's dive straight into this I'm going to start with the model that I created in the previous tutorial for internal boundary conditions I've gone ahead and renamed the plan geometry an unsteady flow file to gold Creek Dam in this one we're going to set up a dam or a roadway and put culverts right through them and utilize some of the new options for entering coordinates for the individual barrel Center lines so if I open R as mapper you can see the animation here I'll take the depth map and you can see the flood coming and going and what I'm going to do now is put a dam or roadway straight across from the high ground here or the high ground here block the river flow behind it so form a reservoir and then we'll put a culvert through it to get some flow going now I always recommend having any structures available as shapefile so that they look recoverable in other CAD or GIS programs or in other models so I'm going to go ahead and make them as profile lines and then export them to shape files if you have them already created we could just import them directly so first I'm going to create the roadway centerline here or the dam centerline from left to right looking downstream I'm going to save this as gold Creek alignment and once I've got that I'll export this as a shapefile and put it in my shape files here with the rest of them cool and I will do the same thing then - for the roadway center line or the culvert centerline creating one from far upstream of the dam - pretty far downstream just to show that we can deal with long culverts now in a different way than you could in version 5.0 3 so this one I'm going to call my covert centerline and when I export this one as well it's going to go into the shape directory and again I'll call this culvert so yeah now that I've got both the damn crest and the culvert defined as shapefiles I'm going to go back into my geometry viewer and import them using my GIS tools now you'll notice under the GIS tools the connection center line table is grayed out you'll actually need to enter something first before you're able to see that table so I'm going to delineate my own damn here and I'll call this gold Creek Dam seven line and with that in there now I'm going to go ahead and go back to my GIS table and now I'll be able to use the import lines function and pick the center line that I've just delineate it as a shapefile I'll grab the coordinates from this one here and paste them right over the top of this I'll get rid of the one that I've imported and now I've got some coordinates here that line up with my shapefile I'm going to take this one now and then force it as a brake line the first editing with cell spacing and next I'm going to enforce it as a brake line so now you can see that the cells have lined up with my dam and I can now have a look at the dam and edit the connection first to make sure my dam works I'm going to take this we're embankment and use the editor to take the center line length and make a weir embankment that is exact like that long and have a look at the elevations I'm going to go looking at the lower left from about 58 over to about 53 on the other side so this will be a sloping embankment and you can have a look here now at the top of the we're now just to make sure that this holds water I'm gonna go ahead and save my geometry and rerun the plan and now I'll recompute this to see if our dam holds water and then once we've had a look at this in razz mapper we'll go ahead and add some culverts to this now the wormhole culverts that we were using before used to connect to any cell anywhere in your model but if you use the standard method you could only connect culverts to the adjacent cells that were immediately adjacent to the centerline alignment that we like the one that we just created and that made it really awkward for long structures where you had overtopping flows over a structure that was very long or also for long culverts that had to be connected from cells that were farther away from the center line alignment so with this done I'm going to go back into grass mapper make sure you close your geometry window first because if you try to edit both of them at the same time you're going to get some errors so we can see from the results now that our dam does hold water when it comes in it fills almost to completion and does not run over so our dam is stable and now we're going to put a pipe in to make sure we can see where the flow is going to enter and exit out of it so I'll close rats mapper you can't edit structures in res mapper yet open up the geometry editor so now I'm going to edit this structure as a connection and we're going to put a we're a culvert inside of this structure so I'm going to go ahead and enter a culvert here the culvert editor that comes up is very similar to the one that comes up in a 1d model but to define the centerline I'm going to go back to my GIS tools now and go to culvert centerline's and import the barrel centerline yes I want to do this and I'm going to grab the culvert centerline that I previously created open this up and now I get a table that says that one barrel was added to it and I could have multiple barrels for this and now with that open you can see in here when I go back in and pull in my structure there's my barrel now I do want it to cross where the G is station tells me it should be crossing to 39.96 and I'm going to do the same thing over here to 39.96 and I'm going to put in a few things here like the entrance loss coefficients Manning's in for a concrete pipe and for my upstream and downstream inverts I'm going to go ahead and measure those straight off the geometry viewer and the geometry of Uri can see the culvert center line here and if I will ctrl down and pull these elevations off I can plot these out and I can see my profile and so I'm going to bring it in at about 43 bring it out maybe at about 38 I'll close these windows and go back into my editor again I'm gonna pull this one in at about 43 let it come out at about 38 entering a diameter I'll make it say 5 meters in diameter there's going to be a very large pipe and okay now pull back open my geometry viewer and have a look here and now you can see the pipe crossing and it's actually crossing on the centerline coordinate right here measured from left to right looking downstream zero being this one and over at around 200 on this side now previously we couldn't let your culverts go underground but now we're going to be able to run it with the culvert in place so I'll close out of that and let's have a look in razz mapper at how we did with this coder and see if we're actually passing water through so now you can see on my depth animation water starts to fill up backs up behind the dam starts to appear down here behind our very long culvert and it's actually getting sucked out from right here now because I created these as shape files I can actually pull these in now as layers so I'm going to add an existing layer and pull in the two shape files that I made one for my culvert centerline and one for the gold Creek Dam centerline I'm going to pull those in now I can actually take these and turn them into larger features click on visualization information and make this as large as you want to make it I'll make this one seven and make it purple and we'll change the parameters for the other ones so you can see that culvert here and I'll do the same for the dam centerline make that one red and very large as well so we can see it very clearly and now your structure shows up and your covert shows up as well so now let's have a look and see if we can tell where it is drawing from and which cells are getting sucked into the culvert as I animate this thing now we need to be able to find a particular time step and let's turn on particle tracing and see where it's getting sucked in so it might fade this back a little bit so you can see it a little better with the terrain in the background and you see that right there that cell that is where it's getting sucked in so if I pull on turn on my to the flow area and the cells you can actually see which cell is being connected to the culvert on the upstream end and we'll go to the downstream end and we'll find the same thing happening down here at the outlet so there you have it this is the new culvert function in heck as he is viewing out of the pipe down there again we've done this with shapefiles but you could enter in the culvert centerline coordinates manually you can shape these around and snake them around any way you'd like and if you're wanting to enter them manually one of the things that helps is to just hold ctrl down in the plan view in the geometry viewer and you can actually grab the coordinates straight from there and paste them into your Koehler centerline table so there you are that's your animation for the day I hope you've enjoyed this if you have any questions please email me and if you have a quest for any future topics that you'd like to see covered here let me know and I'll ramp up the particle tracing speed here so you can see it a little better and you can catch the vortexes or vortices again this would only happen if you're running it in full momentum you won't see this into fusion wave and we'll cover that and many more topics in our courses hope you want to get a chance to sign up for our online courses or our face-to-face courses where we'll cover all of these things in details this is not a good model it's kind of fun to look at but it has not been tried and tested there's a lot more we would have to do this to make it valid but it's been fun to do so with that I'll sign off thanks

Channel: The RAS Solution

Views: 89,095

Keywords: HEC, HEC-RAS, 5.0.4, HEC-RAS 5.0.4, RAS

Id: au1Hyqt7drA

Length: 10min 51sec (651 seconds)

Published: Wed May 09 2018