Route inflow hydrographs through detention basins and reservoirs using the Modified Puls (Storage-Indication) method. Calculate peak attenuation, lag time, and maximum storage for detention pond design.
For educational purposes only. Not a substitute for professional engineering judgment.
The Modified Puls (Storage-Indication) method routes flood hydrographs through reservoirs and detention basins. It assumes a level pool where outflow is a function of storage only.
Where:
Detention Basin Design
Size storage to meet peak flow reduction targets
Reservoir Flood Routing
Determine outflow hydrograph and peak water level
Dam Safety Analysis
Evaluate spillway capacity during design floods
Stormwater Management
Demonstrate compliance with post-development limits
Time step selection: Use a time step no larger than Tp/5 where Tp is the time to peak. Smaller time steps provide better accuracy but increase computation.
Storage-discharge curve: Ensure your data covers the full range of expected water levels. The method will extrapolate if values exceed the provided range.
Volume balance: Check that total inflow volume equals total outflow volume. Errors greater than 1% may indicate numerical instability.