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外文资料Performance evaluation of Low Impact Developmentpractices using linear regressionKEYWORD:SLow impact development (LID);Stormwatermanagement;Urbanhydrologic response unit(UHRU);Hydrologic simulations;Linear regressionABSTRACTAims:To develop a modellingmethodolog for evaluating the cumulativestormwater performance of Low Impact Development technologies on a watershed basis to address stormwater impacts of urban development. Study Design: A method is presented to perform hydrological modelling on large watersheds.Hydrological modelling simulations and linear regression analyses of a small sample of randomlyselected lots were performed to generate results which were extrapolatedto the entire watershed.Place and Duration of Study: Department ofCivil. Engineering, Ryerson University, betweenSeptember 2010 and September 2012. Methodology: Urban hydrological response units were developed by using the K-means cluster analysis procedure to group 6926 lot parcels amenable to the residential rain barrel Low Impact Development practice into clusters. Two versions of a Microsoft Excel macro were developed to run simulations for thousands of lots simultaneously before and after Low Impact Development implementation to determine the total runoff produced by all lots for both cases. The results of computer modelling all lots were compared with the results from developing calculation methods tobe used after computer modelling subsets of lots. Two calculation methods based on clustering lots to form urban hydrological response units were developed.A random sample of 5 % of all lots was then extracted from 6616 lots amenable to the porous pavement Low Impact Development. Stepwise linear regression and linear regression were performed on the random sample for each case of no Low Impact Development and with Low Impact Development. Regression equations were used to extrapolate results from the sample to the entire data set to determine the total runoff volume produced by each se
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