detention volume

[tar]

the plan reviewing municipality has a spreadsheet that they require to be submitted with projects that address the BMP post construction water quality. Within each of the spreadsheets you enter the constributing area and percent impervious. The spreadsheet give you a water quality design volume. Prior to using StormNet I was using PondPack to model the ponds. Within that software I was able to use an interpolation calculator to enter in the design volume and it would calculate the pond elevation at which the volume was attained. From there I could enter the water quality depth in the spreadsheet and it calculated the required orifice opening size(s). It would be nice to have a way to do the same with StormNet. Does anyone know if this is possible?

Also, does the output report give the pond storage provided at the computed high water elevation? Am I overlooking it within the report?

[Chris Maeder]

When you define your detention pond storage curve, you can define it in either depth versus surface area (and StormNET computes the corresponding volume) or depth versus volume (and StormNET computes the corresponding surface area). However, we do not have an "interpolation calculator" that computes surface area or volume based upon a particular depth of flow. I will discuss it with our developers on how to possibly add this to the software.

When you run your model simulation, in the Time Series Plots, you can plot volume versus time, head versus time, and elevation versus time, and see how pond responds to the defined storm. It also includes the high water elevation (depth) in the output spreadsheet report, output report, and in the Detention Pond input dialog.