Stormwater Quality--First Efforts in Denver

by Ben Urbonas, (M.ASCE), Chf.; Master Planning Program, Urban Drainage and Flood Control District, Denver, Colo.,
L. Scott Tucker, (M.ASCE), Executive Dir.; Urban Drainage and Flood Control District, Denver, Colo.,


Serial Information: Journal of the Technical Councils of ASCE, 1980, Vol. 106, Issue 1, Pg. 53-71


Document Type: Journal Paper

Abstract: A sampling program for nonpoint source pollutants was initiated in Denver, in 1975. Some of the data collected and preliminary findings are presented. Tentative conclusions drawn on limited data from three watersheds are: (1)First-flush effects of storm runoff were not evident and pollutant loadings generally followed the hydrograph throughout the runoff period; (2)there is a vague indication that longer antecedent dry periods lead to higher pollutant loads in subsequent runoff, but there are exceptions to this as well; and (3)in comparison with secondary effluent in the same watersheds, storm runoff gave much lower mass loadings to the receiving waters for all constituents except metals. Zinc loadings were two to four times higher than in secondary effluent, and lead was sometimes 10 t0 20 times higher. Data collection programs of this type should be accompanied by immediate data analysis and evaluation, possibly to include computer modeling, to redirect further sampling.

Subject Headings: Runoff | Load factors | Pollutants | Data collection | Data processing | Watersheds | Effluents | Stormwater management | Denver | Colorado | United States | North America

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