Low-Impact Development Hydrologic Analysis

作者：Mow-Soung Cheng, Larry S. Coffman, Michael L. Clar · 年份：2001 · DOI：10.1061/40583(275)63 · 被引用次数：59 · 研究领域：Urban Stormwater Management Solutions、Groundwater and Watershed Analysis、Hydrology and Watershed Management Studies

Low impact development (LID) achieves stormwater management controls by fundamentally changing conventional site design to create an environmentally functional landscape that mimics natural watershed hydrologic functions (discharge, frequency, recharge and volume). This is accomplished in four ways. First, minimizing impacts to the extent practicable by reducing imperviousness, conserving natural resources /ecosystems, maintaining natural drainage courses, reducing use of pipes and minimizing clearing and grading. Secondly, recreate detention and retention storage dispersed throughout a site with the use of open swales, flatter slopes, rain gardens (bioretention) and rain barrels. Thirdly, maintain predevelopment time of concentration by strategically routing flows to maintain travel time. Fourthly, encourage property owners to use effective pollution prevention measures and to maintain management measures. The purpose of this paper is to introduce and describe Low-Impact Development (LID) hydrologic analysis and computational procedures used to determine LID stormwater management requirements. The hydrologic analysis presented is based on the Soil Conservation Service (SCS) TR-55 hydrologic model. LID development site planning and integrated management practices (IMPs) are defined and categorized into components of Lid objectives. Computational procedures for determining IMP requirements are demonstrated through design examples.