Subject: Detention Basin Basics in SWMM 5
What are the basic elements of a detention pond in SWMM 5? They are common in our backyards and cities and just require a few basic elements to model. Here is a model in SWMM 5.0.022 that even has a fountain in the real pond – which we not model for now. The components of the model are:
1. An inlet to the pond with a simple time series – a subcatchment can be added to it in a more complicated model but for now we will just have a triangular time series,
2. A pipe to simulate the flow into the pond from the inlet,
3. A Storage Node to simulate the Pond that consists of a tabular area curve to estimate the depth and area relationship,
4. A Storage Node to simulate the Outlet Box of the Pond
5. Two Small Rectangular Orifices to simulate the low flow outflow from the pond at an elevation less than the weir
6. A large rectangular orifice to simulate the normal inflow to the Box
7. A rectangular weir to
