Three types of criteria will be generated to model the top, face, and gutter pan.
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This will require a feature line intersecting this corner of the parking lot and positioned to project a grading object across the parking lot. Let's try out the scenario of sheet flowing at 2% diagonally across the entire parking lot. This is the elevation we will hold for this parking lot corner. Grade up at 1% for the next two segments until the southeast corner of the parking lot is reached.
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Grade down at 2% to the beginning of the curb return.Or you can manually enter an elevation for that point.įocusing on the east (high) side of the parking lot, we'll grade the next three segments on the feature line.
#HOW TO DO CONTOURING INTO AUTOCAD CIVIL 3D 2013 UPDATE#
The surface, contours and labels automatically update as you enter the values into the elevation editor. For the west curb return, use a grade of 4.5%. Using Elevation Editor, we'll grade from the road to the end of the east curb return using a 6% grade. Obviously the grade has already been set at the road. For this scenario, we'll divert the flow northwest to a detention pond. Since the parking lot back of curb feature line meets this corridor back of curb feature line, the match grade elevations will always be maintained even after the corridor is updated. As you grade the parking lot, these will automatically update.Įxtract the back of curb feature line from the corridor and apply a style with the highest priority for split point resolution maintain its dynamic link with the corridor. Configure a mid-ordinate distance of 1 (don't argue with me). Associate a surface style that shows contours. Add the back of curb feature line as a break line to a proposed surface named "Parking Temp".The proposed road is represented by a corridor. The linework for the parking lot is being represented by a feature line in a site named "Parking". The purpose of this exercise is to grade the parking lot which feeds onto a proposed road. The illustration below shows a parking lot. If there are any fundamental concepts in this post that you do not understand, please refer to Mastering Civil 3D by Richard Graham & Louisa Holland. The example presented in this post will show how quickly and efficiently one can arrive at a grading solution using this method. I've coined this term "heads up grading" for those who give up the paper, scale, and calculator way of grading to use the grading tools in Civil 3D instead. This was referred to as "heads up digitizing" which was a lot more efficient and faster.
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Later, we were able to have the paper scanned, insert the image into AutoCAD, scale it up, and trace it on screen. This was referred to as digitizing which was a very time consuming task. We'd have to throw it over a big ol' digitizing board and trace it with a puck. In the good ol' days, before data collectors were in wide spread use, we used to get our existing topo on paper.