An Auxiliary Method to Reduce Potential Adverse Impacts of Projected Land Developments: Subwatershed Prioritization |
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Authors: | Latif Kalin Mohamed M Hantush |
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Institution: | (1) School of Forestry and Wildlife Sciences, Auburn University, 602 Duncan Drive, Auburn, AL 36849-5418, USA;(2) United States Environmental Protection Agency, National Risk Management and Research Laboratory, 26 West Martin Luther King Drive, Cincinnati, OH 45268, USA |
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Abstract: | An index based method is developed that ranks the subwatersheds of a watershed based on their relative impacts on watershed
response to anticipated land developments, and then applied to an urbanizing watershed in Eastern Pennsylvania. Simulations
with a semi-distributed hydrologic model show that computed low- and high-flow frequencies at the main outlet increase significantly
with the projected landscape changes in the watershed. The developed index is utilized to prioritize areas in the urbanizing
watershed based on their contributions to alterations in the magnitude of selected flow characteristics at two spatial resolutions.
The low-flow measure, 7Q10, rankings are shown to mimic the spatial trend of groundwater recharge rates, whereas average annual maximum daily flow,
, and average monthly median of daily flows, , rankings are influenced by both recharge and proximity to watershed outlet. Results indicate that, especially with the higher
resolution, areas having quicker responses are not necessarily the more critical areas for high-flow scenarios. Subwatershed
rankings are shown to vary slightly with the location of water quality/quantity criteria enforcement. It is also found that
rankings of subwatersheds upstream from the site of interest, which could be the main outlet or any interior point in the
watershed, may be influenced by the time scale of the hydrologic processes. |
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Keywords: | Hydrologic model Pocono Creek SWAT Watershed Urbanization Sustainability Source prioritization |
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