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Detention Pond Routing Simulator

Level-pool (storage-indication) routing · Inflow → outflow attenuation · Peak reduction

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Peak attenuation: 78.1%

Inflow 120 cfs → outflow 26.3 cfs

🌊 Inflow Hydrograph

Peak inflow (Qp,in)120 cfs

Time to peak (Tp)1 hr

Triangular hydrograph · base Tb = 2.67·Tp = 2.67 hr

🏞️ Pond & Outlet

Pond surface area1 ac

Outlet orifice diameter18 in

Prism storage: V(h) = A·h, A = 43,560 ft²

📊 Routing Results

Peak inflow120.0 cfs

Peak outflow26.3 cfs

Peak reduction78.1 %

Max pond stage9.58 ft

Max storage used9.576 ac-ft

Orifice diameter18 in

Method: Level-pool (storage-indication) routing. Outflow uses the orifice equation Q = Cd·A·√(2gh) with Cd = 0.6. Storage is treated as a constant-area prism, V(h) = A·h. The continuity equation dV = (I − Q)·dt is integrated explicitly over the inflow hydrograph to attenuate the peak.

Inflow vs Outflow Hydrographs · Linear Scale

Inflow

Outflow (attenuated)