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DIFFERENCES IN WARM‐SEASON, RAINSTORM‐GENERATED STORMFLOWS FOR NORTHEASTERN ILLINOIS URBANIZED BASINS 1
Author(s) -
Chang David,
Fox Doug,
Bork Steve
Publication year - 1996
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1996.tb03499.x
Subject(s) - precipitation , environmental science , population , hydrology (agriculture) , streamflow , structural basin , drainage basin , urbanization , climatology , geography , geology , meteorology , demography , geotechnical engineering , cartography , sociology , economic growth , economics , paleontology
Precipitation, streamflow, and population data were analyzed over the 1941–1990 period to determine whether changes in stormflows and net (post. minus pre‐rainstorm) stormflows, associated with warm‐season large rainstorms, were similar for two urbanized northeastern Illinois basins. Warm season large rainstorms were defined as April through October rainfall events in which ≪ 5.1 cm occurred in a 48‐hour period over the basin. To minimize differences associated with varying large rainstorm amounts over time, the net sthrmflow for each event was divided by the large rainstorm amount. This ratio, Ui, indicated that the two urbanized basins experienced significant, yet different, increases (102 percent and 49 percent) in flow amount per centimeter of rainfall from 1941–1965 to 1966–1990. Results of a regression analysis between Ui and population showed that the increase in U i per 100,000 increase in population ranged from 0.59 to 0.67 m 3 s ‐1 per cm of rainfall for the two basins. These results demonstrate the varying degree of change that urban planners can expect in stormflows associated with large warm season rainstorms for areas undergoing urbanization.