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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Iowa watershed project: coupled surface-subsurface hydrologic modeling to assess distributed flood m...
Iowa watershed project: coupled surface-subsurface hydrologic modeling to assess distributed flood mitigation practices
Author : NICHOLAS THOMAS(1), LARRY WEBER(2) & KEITH SCHILLING(3)
ABSTRACT
Significant rainfall in the summer of 2008 and subsequent flooding in eastern Iowa, USA induced billions of dollars in
damage to communities, land, and agriculture. Post flood, the Iowa State Department of Housing and Urban
Development allocated $8.8 million to the Iowa Flood Center to plan, implement, and evaluate watershed projects to
lessen the severity and frequency of flooding in Iowa. A two phased approach was applied to investigate how diverse
basins respond to varying input rainfall and the overall flood hydrology at the basin scale (4,000 km2), and the impact of
a specific distribution of flood mitigation practices at the sub catchment scale (45 km2). This paper focuses on the
construction, calibration, and validation of a coupled surface subsurface hydrologic model, and the effects of distributed
projects on peak flows during synthetic and real precipitation events. In 2014 stream stage sensors, soil moisture and
scientific rain gage platforms, shallow groundwater wells, and water quality sensors were distributed throughout a small
scale watershed. A combination of simplified calibration techniques along with watershed scale validation to measured
data offers confidence in the models capability to reproduce watershed dynamics. Incorporation of built practices
through this funding source, along with potential distributions of various flood mitigation strategies are quantified.
Extrapolation from the small scale distribution of projects offers insight into the capability of larger basins to mitigate
devastating flood events.
File Size : 3,007,021 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 19/08/2015
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