Analysis of Urban Runoff Control with Infiltration Facilities
نویسندگان
چکیده
This paper presents two methodologies for estimating the impact of infiltration facilities on reducing stormwater runoff volumes, and pollutant loads, from urban drainage systems. The methodologies have previously been developed using derived probability distribution theory, often referred to in the literature as analytical probabilistic modelling, and differ in that they employ different hydrologic models for the transformation of rainfall to runoff. Moreover, the original model derivations employed herein were developed for the analysis of stormwater detention facilities (dry ponds), and are adapted for the analysis of infiltration facilities. The summary of model expressions presented in this paper permits the reader to perform the necessary calculations to design and analyze the performance of stormwater infiltration facilities with the use of a calculator or computer-based spreadsheet application. Results are generated using the models, and various sensitivity analyses presented, illustrating the power of the models. The models are then used as a basis for comparison with guidelines on the design of such facilities in the province of Ontario, Canada. The results of this comparison suggest that the current guidelines may yield infiltration facilities insufficient in size to meet the performance levels intended to be satisfied by such facilities.
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