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Evaluating Storm Water Management Model Accuracy in Conditions of Mixed Flows

2018; Linguagem: Inglês

10.14796/jwmm.c451

2292-6062

José G. Vasconcelos, Yasemin Eldayih, Yang Zhao, Jalil A. Jamily,

Hydraulic flow and structures

Stormwater systems, while designed to operate in free surface flow conditions, can undergo transition to pressurized flows during rapid filling conditions where inflows exceed the conveyance capacity of sewers and tunnels.Such conditions are referred to as mixed flows or flow regime transitions and pose a challenge to traditional unsteady numerical models.The Storm Water Management Model (SWMM) has an unsteady hydraulic solution algorithm based on an EXTRAN module that can simulate mixed flows.However, due to its link-node solution procedure, SWMM has limited ability to represent highly dynamic flow conditions involving the rapid filling of closed conduits and mixed flows.This work explores the accuracy of SWMM in representing three different experimental conditions involving mixed flows, testing the effects of spatial and temporal discretization on the results.The original recommendation presented in SWMM literature is revised and updated recommendations are proposed to improve SWMM simulation results in conditions involving mixed flows and rapid filling conditions.