Effect of spatial variability of storm on the optimal placement of best management practices (BMPs) |
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| Authors: | C L Chang P T Chiueh S L Lo |
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| Institution: | (1) Department of Environmental Resources Management, Chia Nan University of Pharmacy & Science, No. 60, Erh-Jen Rd., Sec. 1, Jen-Te, Tainan, Taiwan, Republic of China;(2) Department of Environmental Management, Tung Nan Institute of Technology, No. 152, Sec. 3, Peishen Rd., Shenkeng, Taipei, 222, Taiwan, Republic of China;(3) Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, 106, Taiwan, Republic of China |
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| Abstract: | It is significant to design best management practices (BMPs) and determine the proper BMPs placement for the purpose that
can not only satisfy the water quantity and water quality standard, but also lower the total cost of BMPs. The spatial rainfall
variability can have much effect on its relative runoff and non-point source pollution (NPSP). Meantime, the optimal design
and placement of BMPs would be different as well. The objective of this study was to discuss the relationship between the
spatial variability of rainfall and the optimal BMPs placements. Three synthetic rainfall storms with varied spatial distributions,
including uniform rainfall, downstream rainfall and upstream rainfall, were designed. WinVAST model was applied to predict
runoff and NPSP. Additionally, detention pond and swale were selected for being structural BMPs. Scatter search was applied
to find the optimal BMPs placement. The results show that mostly the total cost of BMPs is higher in downstream rainfall than
in upstream rainfall or uniform rainfall. Moreover, the cost of detention pond is much higher than swale. Thus, even though
detention pond has larger efficiency for lowering peak flow and pollutant exports, it is not always the determined set in
each subbasin. |
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| Keywords: | BMPs NPSP Rainfall Spatial variation Watershed management WinVAST |
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