Techniques for Estimation of Storm-Runoff Loads, Volumes, and Selected Constituent Concentrations in Urban Watersheds in the United States

摘要

The purpose of the report is to describe the methods and models of three procedures for estimating (1) storm-runoff loads and storm-runoff volumes, (2) storm-runoff mean concentrations, and (3) mean seasonal or annual loads. The first phase involved the development of linear regression models (hereinafter referred to as regression models) to estimate selected storm-runoff loads and volumes for urban watersheds on a regional basis. The second phase involved developing regression models to estimate storm-runoff mean concentrations, defined as the storm-runoff load divided by the storm-runoff volume. The third phase involved determining values of mean seasonal or annual loads for selected watersheds and developing regional regression models to estimate mean seasonal or annual loads that enter receiving water in urban watersheds. The regression models were based on physical, land-use, and climatic characteristics of urban watersheds.