Storm Runoff and Its Effects on the Water Quality and Bottom-Material Quality of Cedar Creek, West-Central Illinois, 1985-86

摘要

The purpose of the report is to describe the storm-related sources of chemical constituents that affect the water quality of Cedar Creek. In particular, the purpose is to describe the characteristics of combined-sewer overflows and storm-sewer discharges from the city of Galesburg and their contribution to constituent loads and bottom materials in the creek. The report details the interpretation metods and results used to describe storm runoff and to identify the primary storm-related sources of several constituents to Cedar Creek. The report includes discussion of the duration, accumulation, and intensity of precipitation for several storms; the frequency, duration, and peak discharge of overflow from each of 49 combined sewers within the study reach; the constituent concentrations determined from samples of combined-sewer overflow, storm-sewer discharge, wastewater-treatment-facility effluent, and streamflow; the sediment oxygen demands and bottom-material constituent concentrations determined from 45 sites in Cedar Creek and its tributaries; and the storm-related discharge volumes from each of seven sources of storm runoff.