Site Grading in Civil 3D Part 1

[Music] [Music] so site grading and civil3d what's what's the challenge here what are we after here why do we use civil treaty or attempt to use it first for sake rating its we want to model things we want to avoid drawing manual contours civil sturdy is supposed to be a modeling tool we don't want to draft manual contours so I'm gonna attempt to show you ways to avoid that manual drawing of contours and we want to minimize point by point grading so you take a fairly complex parking lot or or any kind of site features and there's a lot of geometry in there and there's a lot of key points that you know spot elevations that you may end up labeling in a final plan but for the most part when we talk about a parking lot for example we have some general drainage patterns that that we want to use to govern how we model that or how we grade that so we're gonna try to look more holistically at how we grade this and not to point-by-point grading then of course how do we combine simple tools to create these dynamic surface models that's another challenge the tools were using that mentions our feature lines and grading tools and surfaces and by themselves they're fairly simple but how you combine them is kind of the trick to it so I'm gonna attempt to show you some tips and tricks on that today so we're going to spend most of our time in the software as we always do and we're going to start out with some pond grading I'm going to use this to kind of introduce some of the basics of site grading and that's use of feature lines and grading tools and we'll move on to the parking lot that'll be the bulk of what we spend our time on it differently is the most complex part of this and we're going to look at making a couple surfaces one will be a drainage surface one will be a curb surface and I'll talk more about that in detail once we get there then we'll have some miscellaneous grading to tie into an existing building that's there and then also between the pond and the parking lot and so forth so that's what we're looking at so let me jump into civil3d and here's that site that we had and the powerpoints and what we're gonna start out with first is this pond so the magenta or the purple line at the bottom here it's just a simple polyline that in fact everything I have including the yellow lines here are just 2d polylines so we've gone we've we've jumped past the 2d layout of our parking lot we're looking at the grading of this so this is just basic AutoCAD drafting to generate polylines like this all the great outlines are existing streets and driveways that we're tying into so this is actually a this building right here is actually ctc's new office and this is kind of a mocked up new parking lot that we're we're supposed to get sometime in the future so what I've removed is the existing parking lot we have here and we're putting in a different smaller parking lot in fact so that's the example here that we have today so starting down here to grade this pawn pawns are probably one of the most ideally suited features to grade with feature liens and grading tools and the way you want to start out is with at least a baseline so I'm going to take this polyline I'm going to turn it into a feature line so I have create features lines from objects you have this with a lot of tools in Scylla 13 and I can pick this polyline and then it prompts me to specify some settings for this feature line one of the first things here is the sight those of you aren't familiar with sights what sights are about is it's not something you see on the screen but rather it's it's kind of a container that you see in tools based so if we have feature lines in the same sight they interact with one another specifically if to feature lines cross one another they assume the same elevation at that point in our site model here we want that interaction sometimes and other times we don't want that interaction so I'm gonna make a new site right away I'm gonna call it pond and curb so we're gonna be putting some of our curb grading than the same site I'm gonna make or give it a certain style we'll go to style of basic and then I'm gonna sign some elevations you'll notice the layer options here those are unfamiliar there's object layer settings that will take the name of your site and place feature lines thrown in that site all on the same layer this is pretty handy to be able to turn off sets of feature lines using layers very quickly so we're gonna sign elevations we're also going to erase existing entities that will get rid of that polyline we could certainly keep it intact but I want to keep a single source of my site design and weed points would be to remove points from the polyline for example there's a vertex here and a vertex there I have no reason to remove any of those as I have this feature drawn this polyline drawing I want each and every vertex that's in there so there's no reason to weed points I hit okay and then I get the assigned elevations dialog box this is where I have options for how I assign elevations what I'm gonna do here in fact is to pull elevations from a surface and that's going to be from my existing surface so I'm gonna hit okay and right away that turns blue that's the feature line style I have signed okay so I have a feature line now here this is basically a 3d polyline with a few extra options on and one it has curves 3d polylines can't have that but like 3d polylines every vertex can have a separate elevation feature lines also I have stationing associated with them and then they're also they can interact with one another as well as with grading objects so in a civil 3d world feature lines replace 3d polylines I can pick on a feature line and I get a whole set of tools in the contextual ribbon here I'm gonna point out a few of the key tools here the first one being this one right here this is quick elevation at it if you know one tool with feature lines this should be it quick elevation edit I click on that and I can hover over any of these vertices and it tells me the elevation it said so these are elevations that came from existing ground so I'm going to continue to use this quick elevation over and over throughout the webinar I can also hover between two vertices and I get an elongated triangle and that allows me to set specify a slope so for example I can pick here and set this elevation to 809 if I were to hover away from that and point away from it and then do a grade of zero eight or nine eight or nine okay so this is this is point by point grading so someone sent it and they said it's a little tough to see the blue feature line let's pick a different color it should be a little brighter a little easier to see in fact I'm also going to turn on my line weights that should make things a little bit easier to see too another common tool with feature lines I pick on it I have elevation editor I click on this I get this table view of each and every vertex in my feature line and as I pick on those any number of these entities any of these vertexes vertices I get a triangle that shows up okay so this is another handy way to be editing to me it's not so great for a point by point editing it's great for doing things like this I pick in there and I do control all to select all of these and then I set all of these to one elevation in this case I'm gonna go to 797 for a starting point the baseline in my pond okay well continue on will use other feature line tools these really are the base lines or the kind of building blocks of site grading as feature lines these will be used as brake lines on a surface also be used to attach gradient objects too so we do have a pond grading webinar in the past that we did so I'm not gonna get into real detail but simply throw a simple pond in there using these gradient objects so I launched the grading creation tools right up here and before I do this I had known I'd realize I had a couple extraneous surfaces in here these are ones we want to create as we go through this let me delete these here so just onto that eg surface okay first button on the left here we have to define what's our site we're gonna build this grading group in and then also create a grading group right here the practice is to call these by the same name as the site so call the grading group pond and term we're going to do automatic surface creation and we're gonna have it create a surface style or a surface for us this tessellation spacing this is about how much detail we get with the surface along our gradient objects I'll point that out in a little bit once we create a grading object and let's create let's call it pond on the end / bits remember in my previous name that's fine we'll call it pond and curb hit okay pond and curb for a surface and hit OK okay once again so this is just set up the next button here is to specify my target surface my target surface is my daylight surface so it's not the surface I just created that was my pond and curb surface that's what will generate once I started making features here so what a gradient object is it's degrade from a feature line for example at a given distance for a given slope or its degrade from a feature line at a given slope to it for until it ties into a surface we're gonna use both of those right here and what I have in here is I have some criteria set define if I click on this I have two of them in the air the basic set is what comes with so it's ready and then I have one called sites and then here I have some system grading criteria defined so I have one here for distance X to one and all this allows me to do is to specify a distance at a slope a rise over run and then we'll grade at that distance so I set the the gradient type I click create grading and then I go and pick the feature line it prompts me in the command line so go ahead and watch in the command line there select the gradient side that'll be to the inside and let's say yes for the entire length and I'm gonna go a distance of 10 feet and I'm gonna go a slope like that okay so what a gradient object is if I pick on it right here that's one grading object if I take a look at this an object viewer it's a simple plane defined by a slope and a width okay so very simple elements we put these together to make all sorts of different features in our site okay I can also pick on here and I can edit this grading for example I can edit this instead of going ten feet I'll go 20 feet and I'll go the same slope and what it does pretty nicely especially when you have a feature line that's at all the same elevation is it just figures out that bottom for you and it kind of trims and targets itself so gradient tools are great for this feature right here so very basic pond we're making here from here I'm going to grade up to the outside and I'm going to tie into an existing grade but only on the backside here so I'm going to do a daylight three two one so this is going to be a three to one slope and it's gonna match into my existing grade so everyone can see well go ahead and turn on our existing grade so we can see those contours quite a few contours there we will adjust that to a different contour interval enough contours there okay so that's what we're matching into there's a lot of relief on this site okay so it's gonna be pretty steep parking lot we're gonna end up with some retaining walls and so forth so I'm gonna do a daylight three two one I'm gonna pick the same feature line and I'm going to pick to the outside it says select great inside I'll pick to the outside over here and I'm gonna say no for apply to entire length and I'm gonna grade just roughly on the back half of this because in between the parking lot on the pond we're gonna do something else and so I can specify a station range and grade roughly on the back half of this and that can tie in let me check some of my grades here let's go look at that feature line elevation editor let's take a look at that we're way up at elevation of 7,000 that's not what we wanted we wanted 797 so we couldn't tell any difference because all the contours were just the same there but they were 7,000 feet up out of the page there so let's try this gradient again now it should be able to find the existing ground surface and I did entire length let's let's redo that I'm gonna delete that grading you notice I ran the delete grading command I also ran the Edit grading you always want to edit things through that interface there instead of just picking on them and clicking the erase button running the erase command so gradients I have will go to the outside will say no for entire length and now we got what we're after okay so some a lot of relief here tying into a steep slope here but we have to capture some of this water in this pond so I am just for simplicity I'm gonna turn this existing surface back off but just so you know what was there I wanted to turn it on for a few moments okay let's move on in the parking lot here parking lot grading is is best handled it with a different approach to it we're gonna use feature lines and gradient objects but one of the things I want to mention here is how we're gonna use two surfaces to do this we're gonna create one surface that represents the pavement of our parking lot we're gonna create another one that represents the curb and some of the gradient and if we step back a little bit and we think about how is a parking lot graded what is a drainage pattern in a parking lot it's often pretty simple it's drainage to this or that catch basin the perhaps a Ridge or a swale here and there the overall drainage patterns are fairly straightforward they can get a little detailed around buildings and things like that but for the most part of your sheet draining this way or that way at a 1 or 2 or 3 percent depends on the scenario so what we're gonna attempt to do is separate the drainage of a parking lot from the detailed horizontal design of it so this will kind of become clear as we as we work through this but what I'm going to start with is to define a very simple l-shaped surface that represents the overall drainage pattern of our parking lot and this is going to be a surface that goes beyond the extents of our parking lot so I'm going to start and I'm going to base it on the building up here so I'm going to start by drawing a polyline from these two faces okay and extend these I'm gonna trim these right here and then I will join these two polylines to make one polyline okay so that's an existing building so it's elevations dictate what kind of you know the elevations of our parking lots so that's where we're going to start with we're going to turn this into a feature line and it's going to represent what that pavement grading should be as it extends up to the building okay so let's start by just making that a feature line create a future line from objects I'll put it in a different site now okay so what we're gonna be making is a handful of feature lines that represent a drainage surface but we don't want these feature lines to interact with these yellow lines that will be turned into curb feature lines so I'm going to put it in a new site called drainage take a basic feature line style and we're going to sign elevations and what we're gonna do is we're going to set this to eight ten point five so finish floor elevation is eight eleven we're gonna go to eight ten point five so why is that okay this is at eight ten point five if we think about the entrance which is roughly right over here what this surface is going to represent is the pavement grades so the elevations out here of the pavement if I were to take that say we're grading 2% to the east if I were to take that grade or that plane and extend it up to the building I would want the start of that that grade to be roughly a foot below or excuse me a half a foot below finish floor because I have a curb drop so there's concrete or a walkway up here and I have a curb that steps down so the surface down here at the bottom of the curb is six inches below finish floor elevation but also some kind of flat grade away from the building so that water drains away so we're going to start at eight ten point five but we don't want that everywhere in fact over here the sum of this is partial basements so we're going to steepen this up a little bit so let's pick on this let's go and use our insert elevation point so that what this got does is gives us additional vertices in our feature line I'm going to leave that at eight ten point five I'm also going to put one roughly down here and leave that at eight ten point five so I have two extra elevation or grade break points that's where the entrance is and from here I can adjust my grades accordingly so I'm going to use my quick elevation at it now and I'm going to hold eight ten point five but from there I'm going to grade up and a two percent so that would put this up here at at eighty 1153 and from this flat spot right here I'm also going to grade down at a negative two percent that will put that some considerably below finish floor I'm also going to put another elevation point right here and from this corner down here I'm going to grade up had a two percent they want to bring it up even a little bit steeper over here like I said this is this is basement on the partial basement on this side right here so the grade at the face of the building on the outside is above finished floor so that's why this is coming up to eighteen thirteen seventeen eight thirteen seventy five so we'll adjust that accordingly we're just trying to get a basic model put in place okay another great feature line tool is this stepped offset command we're gonna take this feature line and we're gonna do an offset to give us another l-shaped feature line and that's gonna be on the east side and the south side of the parking lot and we're gonna do a stepped offset so that we can have it offset at a 2% grade a negative 2% grade so stepped offset and I'm also gonna run this through command so T 4 through allows me to not have to type in a number but the regular offset come in likely out with AutoCAD offset command this one works the same way you have through and then instead of type in a number I can just pick a point out here and then a prompts you to specify elevation difference I'm going to say G for grade and go out a negative 2% okay so that gave me an offset feature line and the elevations are at a negative 2% okay so this whole feature line both of these feature lines and now these represent the the first two base lines of my drainage surface and what I'm going to do is I'm going to connect these with a couple other feature lines we're gonna make one closed border I'm running another feature line command here and I'm just drawing it manually it works a lot like the polyline command except it prompts you for elevation those I pick here you see right after I pick it gives me an elevation so I just accept that and then what I snap - of course it's reading those elevations I've got that same eight thirteen point seven five right there so I'm gonna pick this feature line I'm gonna run a join command so all these commands appear a lot of them are like regular polyline commands except you only have about half as many and these are specific to feature lines and other civil authority line types so I'm gonna run a join I'm gonna join all of these to give me one closed feature line I'm not gonna add this to a surface so these are 3d lines and we're gonna use them as brake lines in the surface it's really nice right in your right-click menu have a add two surfaces brake line and we're gonna put this in a new surface it's not going to be the pond and curb one it's gonna be a different one called drainage okay and I get to add brake lines dialog box a lot of you have probably added brake lines to a surface and civil3d before I want to mention just one thing in there which is the supplementing factors down there so there's those weeding factors to pull vertices out you're supplementing factors this is the opposite so what does that mean what does that do if I set a supplementing factor of 25 when I add these as brake lines what is that 25 let me change my surface style and that'll make sense so here's my surface you can see the gray triangles those represent my 10 and here's my feature line well this brake line has a vertex right here and a vertex right here okay if I set supplementing factors to 25 it's gonna force the true the ten to triangulate at least every 25 feet along this feature line you want to do this when you have feature lines with long constant grades like this that our brake lines in your surface it'll allow you to have a lot more control on a particular pearance of the contours and just get better looking contours in general so that supplementing factors is key with psych rating the things are a little bit busy looking I'm gonna set this back to just contours see a few of them there let's go to the one and five foot in fact okay so I've got the basis of my drainage surface what I'm gonna do next is to put a boundary around this thing and to save a little time I've drawn the boundary already so let me turn it on I have it on a frozen layer it's just a basic polyline but let me show you what it is uh thaw the boundary layer what this is is a polyline that goes around the extents of my parking lot and I've just got an offset of 3/10 there you want to do a to 3/10 or so seems to work about just about right we want to use this as an outer boundary around our surface like we said this is our drainage surface in other words it's also going to represent the finished grade of our of our pavement or our blacktop in our parking lot so I'm gonna put this as a boundary around here but before I do I'm just gonna adjust a little bit so when I drew these feature lines in right here I just kind of rough these in because it's not an exact science here so the boundary I have here I'm just gonna adjust this to tie right in to that okay so it it matches the extents of that the grading outside of this this will be handled in a different way so all of our parking lot grades are gonna be managed by this surface other elevations where we tie in up here will be done and I'm on a more manual basis so I'm gonna do the same thing to the boundary here I just adjust this a little bit so we're at roughly that 3/10 offset okay so I'm making this an outer boundary I pick on my surface I have add data and I have boundaries another common tool if you're totally new to civil3d it's just something to limit the triangulation in your surface very common command and Siletz ready so I add boundaries and then I go and pick we'll call this outer the type of boundary is going to be a outer boundary and we want it to be a non-destructive but non-destructive means if it's turned on my surface will trim exactly to the polyline if this is turned off that polyline boundary will eliminate entire sets of triangles that it touches meaning any triangle that it crosses will be eliminated from the surface we'd end up with a 10 that's very small mid or in a distance this is about how much it how it triangulates along curves in right here so I've got curves in this boundary a tin can't have any curves in it it only approximates it with chords so if I set this to point one it'll make more sense when I put the boundary in there if I set it to point one this green line here this is the Michoud over here this green line here this is the limits or the outer boundary of my surface even though the cyan line is the polyline they used so what the mid or the distance is is this distance right here to here so it's the distance between the midpoint of the cord of the arc and the arc itself that is no greater than 0.1 I kind of rough that in there but the what do we have for a length point one zero zero six oh so these might seem like small details but they make a big difference in terms of how your ten triangulates and detailed site designs like this so if I look at this surface now I'm starting to create something that represents more of a parking lot so if I don't have any curb and it was just a fairly basic black top surface you know I'm getting pretty close and I need to sense more due to time designing this but this would be a very quick way if we just had blacktop or asphalt but we've got curb when we have kerb Islands the other thing is this surface doesn't give me a whole lot of flexibility I only have future lines a feature line on the outside so I'm going to draw a couple other ones in here that give me some more control on the triangulation so I'm going to create another feature line put in the same site this one I'm going to connect right here and right here okay I'm also going to make a couple right here so I can control some of the triangulation around this building entrance here so if I need to flatten it out for a DA requirements I have some of those feature lines to do that you notice when I did my offset of the feature line here it put these same vertices in here I'm gonna hang on to those but I'm gonna set my grade to be constant from this corner to this corner so this introduces another feature line tool if I pick on this feature line I have a command up here set grade slope between points I'm gonna pick on that and if I pick this point right here it tells me what's the elevation it's eight oh eight point eight I can hit enter and as I drag my cursor down you can see it highlighting those elevation points in the middle here I go to whatever endpoint I want and I pick that and it says specify grade it actually calculates the grade between those two points so if I just hit enter now and accept this it will adjust those two points let me make sure my surface is on rebuild automatic and you should now see those contours adjust a little bit so we have a constant grade back here and on the face of the building we've got we've have it flattening out by the entrance so I'm going to draw a couple more feature lines in here like I said to control some of the grades right up by the entrance so again create feature line command prompts me for site we're gonna still work in the drainage site and hit OK and again I'm just snapping to those locations and a snap to that point as well I'll put another one right down here okay so those are feature lines there in the site but they're not in the surface yet so I need to pick these feature lines and select I had two surfaces brake line I'm gonna put it in the drainage surface and we're going to take those same supplementing factors I want triangulation to happen along the length of these long brake lines so 25 there's that mid ordinate again that doesn't come into play here because I don't have arcs in my future lines but if I did that would dictate how it would triangulate along them and as soon as I do that you can see I start to have some control let's take a look at this so I see things are triangulating along that feature line and now there's another issue now it's triangulating outside my border okay this is a fairly straightforward thing but something a lot of folks mess so if I pick on my drainage surface and I look in surface properties and I go to the definition I'm gonna notice that my boundary was added before my brake lines you need outer boundaries to be the last in your list so you can use these arrows to push them to the bottom of the list and hit OK and rebuild the surface and now you're going to see that update with it okay continuing on here the whole point of making this drainage surface is so that we can assign elevations from it to our curve okay one other change I'm going to make here see we have some really steep grades over here I'm going to grab this feature line I'm going to put an elevation point right about here so put an elevation point there and then I'm gonna use my quick elevation at it and I'm gonna just this great a little bit go a negative 1% and you see as I do that I get some more control on this will flatten things out over here a little bit flatten that out a little bit okay I'm not gonna spend a ton of time on the design but this is how we want to put together our drainage surface we want to look at overall drainage patterns we need to think about of course where are our violins where our ridges and swales and catch basins and we want to design accordingly but we want to have a fairly basic surface like this and the reason is is because from here I can create my curbs fairly easily so these yellow lines represent the gutter line so we're going to be ignoring the gutter itself from gutter to flange and we're just going to grade the face of the curb and the top of the curb so I'm going to pick the command create feature lines from objects and I'm going to pick to start with these two polylines and we're gonna put them in the pond and curb sight I'm gonna sign in a feature line style of curb I'm also going to assign elevations and the key here is that the elevations come from the drainage surface so now these have all sorts of elevations that came from that drainage surface okay now we can use our grading tools because we have from some fairly constant slopes to deal with so we use feature lines and Britta's brake lines and surfaces when we have something like the overall drainage pattern of a parking lot there's not a lot of constant slopes the drainage is fairly simple but there's a lot of kind of warping of of the grades to meet existing and you can't you know we could have for example taking this feature line that I drew on the face of the building run a gradient object at 2% out but that wouldn't give us a lot of flexibility what I had done right over here I adjusted that okay but I wouldn't be able to do that if I had a gradient object that just went 2% all the way out so I like making my drainage surfaces with feature lines like this so what we're gonna do now is you're going to start grading some of these curve Islands and just looking at the time here you know as we mentioned this is a two-part webinar here we'll get as far as we can today we'll get the bulk of this parking lot graded and then it might be just to touch a clean up that would push into next week but we'll get through the most of most of it today so so I'm going to set my grading type to curb face now I'm actually gonna edit this gradient I want to show you what this looks like if I open it up I have some I have a relative elevation grading defined the relative elevation is 0.5 and I'm taking a standard Minnesota curb face which is it has a slope of point three three two one I have everything locked down so when you do this it doesn't prompt you for these parameters and so it works like this pick on curb face go to create grading go pick the feature line so again gradient objects need to attach to feature lines I pick this the gradient side will be to the inside and I'm going to say yes for entire length and right away what I get is a curb face I'm gonna put the curb top on there as well and I'm gonna show you in 3d what this looks like so the curb top is just a 0% six-inch grade there's there's one one comment here about a polyline turning into a feature line it will grab elevations of the first feature line yeah so if this this feature line right here was added to a site that already had a feature line and it was crossing it this feature line would assume the elevations of that first feature line so good good good note to make there okay the last thing I'm gonna do in this curve island is to put in what's called an envelope you have a closed area within feature lines and gradient objects you can put an infill you can see as I do that it's maybe a little tough through the screen through the broadcast but it highlights so I know it's gonna make a infill right there and when that little diamond shows up you know it's created an end film so if I go pick this surface now remember this surface right here is my pond and curb surface so if I look at this an object viewer what I have now if we look at the curb you can see that curb face you can see the top a curb and then the infill just connects triangles across so what about this detail here that's that doesn't look like a very nice-looking curb if you remember that tessellation space in that was when we originally created the grading group trading group properties I have tessellation spacing that's set to five right now let's bring it down to three and grade this other curb island and we'll see more detail on there so when you're putting these models together keep the tessellation up five six seven something like that you don't need a ton of detail and then when you want to see a lot when you want to see more finish finish contours you can dial this down so I hit OK it won't change right off the bat there needs to be a change or an edit to the grading group and then we'll see that reflected so I'm going to go to curb face again create grading and pick this feature line now apply to entire length that gives them a curved face and right off the bat we see a little better detail and our curb surface let me go to curb top put this on there and what if you don't want it to grade flat across here what if we wanted to mound it up a little bit okay I could do a distance I had a percent grade and I could pick this and the entire length and go a distance of five feet that's a ten percent when I do that you can see this contour coming in here I can now put an infill in here and finish out that hole I think I may may have a little hole up here too okay let's take a look at this an object for you again and now we can see that mounted up a little bit okay however much you want to do that do you need to do that many cases most people they don't they don't bother but if you need to put it there you can okay let's keep moving on there let's take a look at the drainage surface and the curb surface at one at the same time in object viewer so the red is mica pond and curb surface and the gray is my drainage surface and combined they start to make what is our overall finished grade surface for our parking lot but I want to point out a couple things here maybe a little tricky to see if you remember we drew a couple feature lines right here in that drainage surface there was one right here and there was one right here okay right now this curb feature line doesn't have a grade break there but I have a grade break in my surface so it can be a little tough to see in here but what we need to do is to put elevation points at those crossing points or those those grade break points in our drainage surface and not to be confused you know the comment that was was made earlier about a feature line crossing another feature line that was already there this is a feature line here the red one this green one right here is also a feature line but they're in different sites so the elevations of this green feature line do not have any effect on the red feature line and that's the way we want it we want the red feature lines or the curb feature lines to only pole elevations from the drainage surface and not have the feature lines themselves dictate so what I would want to do here is to put a couple elevation points at these grade breaks they might be pretty slight but we want to pick those up so right here then in the command line I can say s for surface and pole elevations from right there it's prompting me it's telling me the drainage surface 8:08 0.77 I can hit enter to accept that and we'll put one on the other side as well okay so we're picking up those key grade breakpoints let's continue on with at least this inner curb line here that's going to have elevations that come from the drainage surface as well and now this boundary it starting to make sense not only is it is it the limits of our drainage surface but we wanted to go a little bit past this feature line because this right here when I turn it into a future line needs to pull elevations from that drainage surface and when we paste the two surfaces together that'll be one of the final steps we'll see that that little three tents on the drainage surface gets trimmed off of there so let's make this a feature line as well we're gonna put it in the pond and curb sight it's going to be a curb we're going to sign elevations and again it's going to come from the drainage surface if I go take a look at this feature line that's going to have elevations all over the place again we've got to pick up these grade breaks right here though so the simpler you make your drainage surface the less you have to do this but it's not really too big a deal you need to have some detail around entrances and and so forth so so again I'm just pulling elevations and putting elevation points in there pulling elevations from drainage what about tying in over here if I look at this feature line an object viewer what's it going to look like well it looks great up here but that's the extents of where the drainage surface is so we make the drainage surface so it stops a couple vertices short of where we're tying into existing so this curve and straight segment right here that's right over here so right up here is where we tie into existing so I can use the quick elevation at it pick on this and I have s4 surface in my command line and then I can say yes for a different surface and pull elevations from existing grade then it prompts me 8 1901 that sounds good we'll hit enter to accept that and I have a couple of vertices in between here I'm gonna run the set grade between points one more thing I'm going to put an elevation point right here pull elevations from my drainage surface okay so that point right there is attached to drainage surface where it's elevations are read from it that's read from existing and I'm going to set a constant grade between those two with this command set grade slope between points so pick this point up here enter to accept it pick this point down here enter to accept it and now I have elevations assigned right here and here it's a constant grade I can certainly adjust that after the fact when I get into more detailed design I'm just building my model at this point so let's go up here I'm going to do the same thing fairly quickly on this end so I'm in tight there pull elevations from the drainage surface this point is where I tie into existing so I'm gonna pick there and pull elevations from the existing surface again set grade between points click there pick there set the grain hey same operation from here we use our gradient objects when we put a curb face on them I go entire length with this and I'm also going to put a curb top on here so now this curb and pond surface is starting to include curb along the building so in some areas like over here we just want to match into existing in other areas we will need to tie into the face of the building so I'm going to use a daylight to grading object on some areas in here freeze these feature lines we don't need those I'm going to use a daylight three two one I'm going to say no for entire length I'm going to go roughly about here all the way around to right here so these gradient objects you can always pick does it go the entire length or does it just go a certain station range when I drop that in there now it's tying into existing so we have some significant cuts here it's because we have a lot of grade right here so we in some cases it may be call for a retaining wall or any number of things I'm gonna do the same thing up here a start point we right at the beginning there and the end point what a grade two right about here matching them to existing so what about these areas between the back of curve right here and the face of the building well I have to define a feature line at the face of the building so I'm going to start by drawing a polyline I'm going to turn feature line and I'm gonna put it in the same site and we put it in the same site it's gonna allow us to interact have it interact with these other ones so we'll give that a basic feature line style will assign elevations from existing grade because like I said this is an existing building we're mostly matching into what existing grade was there but certainly some variation gonna turn on my layers I forgot I do want to see those feature lines one more time this one I just created here I want to put an elevation point right at that same grade break and this elevation what should this be if this is the entrance this is the finish grade and elevation here so this is 8/11 right here we're also going to put another one that would represent the width of our entrance and so that one will be 8 11 as well okay and the rest of these at this point are just matching a new existing if I draw a couple other feature lines again starting with polylines a polyline here and another polyline here and we turn these into feature lines and we pull elevations from existing so after all existing is right there that's where this daylight grading was this building feature line that's matching to an existing right there so we just kind of need to connect these two points and these aren't constant slopes in there but we want to form what's called a closed area so I'm going to pull elevations from existing grade and what we have in here now in this whole gap is a closed area where we can now put an infill so I placed that infill in there you see this triangulation fill in and those contours come in there so let's take a quick look at an object viewer you can see that all fill in there is it doing quite what we want well not really so we can do things like put a couple extra elevation points in this feature line and when we do that it's going to start to give us more triangulation along the speech line and ultimately more control of all these contours look okay so one final step here and then I think we'll wrap it up for this webinar the process on the backside here is gonna be real similar and I'll do it at the beginning of the next webinar the part two of this but it's gonna be putting some kerbin some daylight gratings we're gonna add one other element to it which is going to be to put a retaining wall on the backside of this this will be much like adding a daylight to surface grading but it'll just be a much steeper slope so I'm going to go over to my surfaces here and should I want to point out one thing if we grab our urban pond surface as well as our drainage surface and we can look at these what we have is basically what we want that's our finished grade right designs not quite done but we can now start start manipulating those feature lines what I need to do is to paste these feature lines together thing to note right here if we zoom in close why does that look like that right there my curb is sitting above my drainage surface well this is a case where we have to put a grade break in our curb feature line to pick up the grade break that exists in the drainage surface so what we need to do here is to combine these together and we do that through surface pay students so I'm going to turn off both of these surfaces set them to no display I'm going to make a new surface we'll call it f G and there's a nice tool called surface paste if you're not familiar with this it's a great tool that's where you can combine different component surfaces like we have done here and paste them together and so what we want is to pay its drainage first when I do that it shows up now here's the key you paste drainage first and then your curb one second and these areas where it overlaps the last one pasted will control so here's what that looks like if I go in and paste in my pond and curb surface now it trims that trims that out and we get a combined surface it's open that's an object viewer again and we get one surface okay so the key to all this remember the drainage surface we made very basic set of feature lines at any point we can manipulate those feature lines and we can change the overall drainage of our surface and then from there at any point we can grab our curb feature lines and we can pull elevations from that drainage surface again that's the whole point of this model is that each and every one of these vertices each and every one of these we don't have to think about the exact grade for each one of those so when we come back to part two when I come back to part two we will finish the site here and we'll also fill in some gratings so just one question that came you know why don't you keep all the feature lines together right away why not avoid the pasting because what we don't want is feature line interaction between the curved lines and the drainage feature lines what I want to be able to do is to keep that independent the if you if we start putting those feature lines from both of those in the same site some of this interaction that we have right here where I can put an infill in there let me open up I turn on those drainage feature lines I was able to put this in fill right in here and this fills this whole area in between the building and the back occur if these drainage feature lines right here these ones I have selected if those are in the same site they're gonna interact with all of this they're not gonna allow that in fill and even worse these drainage feature lines if they cross this grading object right here this is a curb face in a curb top a sharp grade change their feature lines will interact with grading object created feature lines as well so this line right here that's in fact like an embedded feature line so if that's in the same site is this feature line which is six inches below it they're going to interact and assume the same elevation we don't want that there's another question do you have also have grading criteria for the lip of the curb and gutter you could exactly very easy to create I don't put it in here and I find that most of my clients are able to get away with not grading the lip or the the gutter of the the curb that the grades work well enough so so think about a little on your end why that would be but there's nothing saying that this original feature line couldn't represent the lip of curb and that we then grade gutter face and top it just gets a lot trickier when you have to start dealing with tip out and tip in curb

Channel: ATG USA

Views: 58,389

Keywords: Autodesk, Autodesk Civil 3D, High Quality Designs, Coordinated Designs, Architecture, MEP, Structural, Detailing, Engineering, AEC, AEC Industry, Construction, Integrated Tools, Infrastructure, Projects, Design, Competitive, BIM, CAD, Workflows, Faster Site Layout, Documentation, Software, Civil, Drafting, Integrated Features, Powerful Reporting, Design Driven Documentation, Respond Faster, Adjust Gradings Quickly

Id: NGIFEq_IHyI

Length: 57min 35sec (3455 seconds)

Published: Mon Oct 29 2018