Storm Sewer Computer-Aided Design and Uncertainty

by William P. Gilman, Carnegie-Mellon Univ, Dep of Civil, Engineering, Pittsburgh, PA, USA,
Mitchell J. Small, Carnegie-Mellon Univ, Dep of Civil, Engineering, Pittsburgh, PA, USA,

Document Type: Proceeding Paper

Part of: Computer Applications in Water Resources


A micro-computer based storm drainage model is presented which facilitates urban storm sewer design on fast tracked construction projects. The model is an interactive Basic program using a time-lagged Rational Method to compute design flows, required pipe diameters, sewer appurtenances, and estimated project costs. For design rainfall intensities the model incorporates a new generalized rainfall intensity-duration-frequency formula. A sensitivity/uncertainty analysis is conducted on the model to determine the range of possible design solutions and associated costs, and to identify which design input parameters most significantly affect this range. The model is replicated using a Latin hypercube sampling scheme, and regression and rank order correlation are used to identify the parameters most important to the resulting design cost.

Subject Headings: Computer aided design | Rainfall intensity | Storm sewers | Uncertainty principles | Hydraulic models | Computer models | Parameters (statistics) | Sensitivity analysis

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