Unit Response Approach for Priority Determination of Flood Source Areas
Publication: Journal of Hydrologic Engineering
Volume 10, Issue 4
Abstract
Flood damages are usually concentrated along certain reaches of the main watercourse. However, a successful flood-control project must look beyond the damaged reaches by studying the contribution of headwater subwatersheds to the flood magnitude at downstream locations. Flood-control measures may then be initially planned in identified flood tributary areas of the watershed that strongly affect the flood peak at downstream river reaches. A simple iterative simulation technique is introduced, whereby the contribution of each subwatershed unit or group of subwatershed units to the flood peak response can be disaggregated. A flood index may then be assigned to each contributing unit to determine the change in response of outlet flood discharge caused by removal of that unit. The technique is similar to the unit response approach in groundwater studies. The proposed technique is applied to a watershed; and the effect of such different factors as design return period, storm duration, and size of the contributing subunits are examined. The interpretation of results is based particularly on the flood index corresponding to the contribution at the outlet per unit area of subwatersheds. For the watershed under study, the flood index analysis showed that while the differences in the contribution of subwatershed units may be salient for up to return periods, the contribution per unit area is expected to converge for rare floods. Moreover, subwatershed units that have larger area or that are nearer to the outlet may not necessarily generate higher flood contributions.
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Acknowledgment
The comments by two anonymous reviewers are appreciated.
References
Ghaemi, H., and Morid, S. (1996). “Model of flooding in subbasins of Karkheh.” Nivar Journal, 30, National Iranian Meterological Organization, Tehran, Iran, 10–27 (in Persian).
Gorelick, S. M. (1983). “A review of distributed parameter groundwater management modeling methods.” Water Resour. Res., 19(2), 305–319.
Hydrologic Engineering Center. (2000). Hydrologic Modeling System HEC-HMS: Technical reference manual. United States Army Corps of Engineers, Davis, Calif.
Islam, M. M., and Sado, K. (2000). “Development of flood hazard maps of Bangladesh using NOAA-AVHRR images with GIS.” Hydrol. Sci. J., 45(3), 337–355.
Juracek, K. E. (2000). “Estimation and comparison of potential runoff-contributing areas in Kansas using topographic, soil, and land-use information.” USGS Water Resources Investigations Rep. WRI 00-417, Prepared in cooperation with the Kansas Department of Health and Environment. 55 p. Available on the web at http://ks.water.usgs.gov/Kansas/pubs/reports/wrir.00-4177.html
Saghafian, B., Julien, P. Y., and Ogden, F. L. (1995). “Surface runoff similarity in catchment response: 1. Stationary storms.” Water Resour. Res., 31(6), 1533–1541.
Smith, K., and Ward, R. (1998). Floods: Physical processes and human impacts, Wiley, New York.
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© 2005 ASCE.
History
Received: Aug 11, 2003
Accepted: Jun 8, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
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