By Edited by Michael L. Clar, P.E., D.WRE, Robert G. Traver, Shirley E. Clark, Shannon Lucas, Keith Lichten, Michael A. Ports, Aaron Poretsky
Chosen papers from the 2011 Low influence improvement convention, held in Philadelphia, Pennsylvania, September 25 28, 2011. subsidized by way of the Low effect improvement Committee of the city Water assets learn Council of the Environmental and Water assets Institute of ASCE Insite improvement, the speedy adoption of low influence improvement (LID) expertise for stormwater administration, can create conflicts one of the a variety of municipal enterprises tasked with overseeing land use judgements. Low effect improvement know-how: Implementation and Economics comprises 9 papers that tackle implementation systems and the industrial influence of LID expertise. themes comprise: laws and codes; making plans and data alternate; coverage incentives; outreach actions; operations and upkeep issues; and life-cycle expenditures and function metrics. A spouse quantity, Low impression improvement expertise: layout equipment and Case reviews, can also be to be had. either collections could be of curiosity to engineers, land planners, and executive officers engaged on stormwater administration and land use coverage
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Extra resources for Low impact development technology : implementation and economics
This ͳͺ 22 LID: IMPLEMENTATION AND ECONOMICS EPA report could help inform owners that LID practices can be fiscally and environmentally beneficial. The LID practice with the greatest capital cost, compared with its conventional alternative, is a green roof. A life-cycle study by the City of Portland compared the performance of a green roof to that of a traditional roof on a new fivestory office building with a 40,000-square-foot roof over a 40-year period (CostBenefit Evaluation of Ecoroofs, Low Impact Development, Low Impact Development 2008, ASCE).
LID practices, if applied systematically at the subdivision or small watershed levels, can reduce the size and cost of flood risk management practices, because they reduce runoff through detention/retention, infiltration, and evapotranspiration. However, LID practices may also increase costs due to expensive plantings and media, underdrains and connections to stormwater systems, and the cost of land where real estate is at a premium. Proper design can minimize these costs. One way to overcome the perception of cost as a barrier is to provide a comparison of the cost of stormwater management using conventional control practices with that of using LID practices.
A unique aspect of LID is the application of performance standards for volumetric reduction as well as water quality improvements. By creating a performance standards and providing a tool box of possible solutions, the designer can develop an appropriate system to achieve these goals. ʹͻ LID: IMPLEMENTATION AND ECONOMICS 33 The document provides a thorough discussion of the benefits of Cluster or Open Space subdivisions and how to create flexible zoning regulations to achieve these results. The use of these types of development can yield tremendous positive results on the quantity and quality of runoff from the development.