Detention Pond Design with Civil 3D & Storm and Sanitary Analysis

Hi All,

Check out this video for creating a pond in Civil 3D and then sizing that pond within Storm and Sanitary Analysis.

(0:00) Introduction
(0:22) C3D Pond Creation
(3:11) C3D Stage Storage
(4:31) Setting Background Image SSA
(5:13) Defining Ex Basin
(5:48) Defining Rain Guage
(7:27) Setting Project Options
(8:20) Setting Analysis Options
(9:17) Run Analysis/ Evaluate Existing Conditions
(9:53) Defining Proposed Basin
(10:55) Defining Storage Node/ Detention Pond
(14:02) Evaluating Storage Node/ Detention Pond

[garyrendano]

very awesome.. but i wish u showed us how to print the report and read it

[paulpalm]

IMPORTANT NOTE for people using the Stage Storage tool. If you have a survey of a basin (i.e., a tailings dam or "bowl" shaped basin that has an uneven floor), when using the stage storage tool, the tool will ignore volumes of depressions in the basin that occur at the same elevation. For example: imagine a completely flat ground and now three holes are dug. Civil 3D will ignore the volume that two of these holes have and will only calculate the volume of one of the three holes. This means the total volume it returns will be much less than what is actually available.

The stage storage tool makes certain assumptions about the land and the water storage areas, such as assuming that the storage areas are perfectly flat and uniform in shape. If these assumptions are not valid for the particular scenario being modeled, the volume calculations may be inaccurate. In reality, storage areas can have variations in elevation, curvature, and irregular shapes that may affect the volume of water that can be stored. If the tool does not account for these variations, it may underestimate the actual storage volume.

I.e, if a storage area has a depression or basin that is not perfectly "flat", the tool may not accurately calculate the volume that can be stored in that area. Similarly, if the storage area has irregular boundaries, the tool may not be able to accurately calculate the volume that can be stored in the corners and edges of the area.

THE FIX: Using the "Volumes Dashboard" tool instead. I wrote a short step-by-step document on how to use this method instead to bypass the issue of the Stage Storage tool. Reply to this comment with your email if you'd like me to send it.

[jglasco]

Where does the storage curve loaded @11:29 come from?

[BellEngineering]

I can't seem to connect a weir and an orifice to an outfall node. It gives me an error stating that only one link can be connected to an outfall. How did you bypass this?

[Mdcgeek]

What would you do differently to show different return periods? Most municipalities require basins designed for anywhere between the 2-year and 100-year storm events.

[jarexmat]

How do you incorporate the soil percolation rate of the pond floor?