Stormwater Management Decision Support System for Using Low Impact Development Best Management Practices in Industrial Areas

Abstract

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Climate Change Impact on Critical Source Area Identification in a Maryland Watershed

“…It is interesting to compare the reductions of advantage ratios predicted above to the results obtained under current climate by Wang (2015) for a suburban and an urban watershed in Maryland's Piedmont and Atlantic Coastal Plain physiographic regions. The advantage ratios for the suburban watershed were similar to those obtained for the Greensboro watershed under current climate (approximately 1.5:1, 2.7:1, 2.5:1, and 2.2:1 for SurQ, TSS, TN, and TP, respectively), while those for the urban watershed were similar to those obtained in the present study under climate change (approximately 1.3:1, 1.7:1, 1.6:1, and 2.3:1, respectively).…”

“…This was followed by intersection of spatial data layers to identify and characterize HRUs within each subwatershed. Slope and land use thresholds were set to zero (0% or zero land area) during this process to prevent elimination of infrequent HRUs that may correspond to those unusual combinations of characteristics that lead an HRU to be a hotspot, and to support later map production activities (Wang et al, 2106;Wang, 2015;White et al, 2009). The SWAT model was run with the resulting input files, and the output was evaluated with the accounting and analysis tools listed in table 1.…”

“…However, adjustments were made for the optimum use of time and computational resources because, depending on the number of parameters, a single simulation could take from 10 to 20 min. The selection of parameters for the calibration process was based on sensitivity analyses presented in prior literature on SWAT (Sexton et al, 2011;Wang, 2015). Hydrograph and baseflow analysis tools (WHAT and SWAT Bflow) were used for the initial hydrologic calibration to fit a baseflow coefficient (ALPHA_BF) and experiment with hydrograph separation and weighting to improve hydrologic statistics, respectively.…”