Model-based verifying whether rational method flow rate is design return period maximum flow rate or not
Model-based method for calculating storm sewer design flow rate has been being constrained by a lack of normative method for developing design scheme model.A technical route is modeling on basis of Rational Method(RM),or developing model that is equivalent to RM.The purpose of RM is to calculate maximum flow rate of design return period,and its reliability de-pends on theoretical assumptions and parameters values.Based on RM case in textbook,modeling results showed that InfoWorks models with fixed runoff coefficient could not be equivalent to RM design scenarios.28/31 of SWMM models achieved equivalence with RMs.This study used models that were equivalent to RMs to obtain maximum flow rates of design return period and then com-pared them with the results of RMs.The substantial assumption supporting RM was falsified in 25 scenarios and held true in 3 scenarios,that is,RM theoretically should obtain maximum flow rate of design return period.However,only 1 scenario made it,indicating it is difficult for designer's experience to fully consider rainfall-runoff-sheet flow process and propose correct RM parameters values.RM cannot guarantee maximum flow rate of design return period.The technical route that develops model based on RM is not worth further exploration.
Urban storm drainageStorm design flowRational MethodStormwater mathe-matical model
万方数据
维普
