Simulation-Optimization Methodology for the Design of Outlet Control Structures for Ecological Detention Ponds

Abstract

AbstractThis work presents a new paradigm for the design of stormwater detention basins. Through simulation and optimization, this work seeks to find the design of a detention basin outlet control structure that reduces the ecological impairment to downstream water bodies. Ecological impairment is measured using the ecodifference, a metric that represents the hydrologic alteration in the stream. The ecodifference is defined as the weighted sum of the eco-flow statistics, nine hydrological flow statistics that have been shown to be particularly relevant to ecological quality. In this simulation-optimization methodology, a genetic algorithm (GA) is combined with a hydrologic simulator of a detention pond. The GA is used to design the openings in the outlet control structure that minimizes the ecodifference. Constraints are used to meet current municipality design regulations. The simulation-optimization methodology is been applied to a case study site, and resulting designs demonstrate that improvements in ...