Graphics Programs Reference
In-Depth Information
FiGuRE 18.7 Lot 70 after the building pad has been
adjusted downward to eliminate the steep slope
using hydrology tools
Civil 3D provides two very useful tools to help you analyze the drainage perfor-
mance of your surface: Water Drop and Catchments. The Water Drop tool shows you
the theoretical path of a drop of rain as it flows downhill from a location you specify.
By analyzing this path, you can determine the direction of low and find low spots
where water will stop flowing and begin to accumulate. A catchment shows you the
area that drains to a point you specify. This is helpful for stormwater-management
design, such as determining how large an inlet opening needs to be based on the
size of the area contributing runoff to it.
If you haven't already
done so, download
and install the files for
Chapter 18 according to
the instructions in the
Introduction.
Exercise 18.3: Analyze hydrology
In this exercise, you'll use the Water Drop tool to analyze the flow of runoff to
two inlets. Then you'll use one of the Catchment tools to determine the area
contributing runoff to that inlet.
1. Open the drawing named Using Hydrology Tools.dwg located in the
Chapter 18 class data folder.
In this drawing, the
feature-line layers have
been turned off. Also,
a new surface named
EG-FG Composite has
been provided. This sur-
face was made by creat-
ing a new surface and
pasting EG and FG Final
into it. The purpose of
this surface is to enable
the analysis of the entire
project as though it has
already been built.
2. Click the Analyze tab of the ribbon, and then click Flow Paths 
Water Drop.
3. When prompted to select a surface, press Enter to indicate that you
would like to select the surface from a list.
4. On the Select A Surface dialog, click EG-FG Composite, and then
click OK.
5. On the Water Drop dialog, click OK to close the Water Drop dialog box.
In the left viewport, click a point in lot 29 near the road. A blue
water-drop path is drawn from lot 29, down the curb line, to the inlet
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