Agenda - 02-05-1990 - Laserfiche WebLink

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3 1 . A non-structural (or land use control) approach is preferred. 2 . A four percent (4%) impervious surface limit is preferred. 3 . A five-acre minimum lot size is preferred. The strategies were based on the following CDM recommendation: "Restrictions on density and imperviousness represent the preferred approach to watershed management. For those jurisdictions which elect to rely in whole or in part upon land use controls, a five-acre minimum lot size for single-family residential development is the optimum restriction. In order to be effective at managing future nonpoint pollution impacts, the 5-acre lot requirement must be accompanied hy a Ai imperviousness ceiling. To ensure adequate water supply protection with land use controls alone, a minimum residential lot size of 5 acres (4% imperviousness) or a clustered development equivalent should ideally be maintained throughout the watershed. " The agreement and the strategies identified above are the basis for the proposed revisions to the interim and permanent development standards . Spreadsheet Template Development Initially, 36 sketches of various development options were prepared and evaluated for compliance with the impervious surface standards. Because of the limited number of options, and based on the examples provided by Mr. Birch, a Lotus 1-2-3 template was prepared with which to evaluate individual building sites (see Attachments .q and 23) . [Lotus 1-2-3 is a computer software program presented in an accountant's worksheet or spreadsheet format. Also referred to as a template, the format permits the user to organize data and perform a variety of calculations. The worksheet as well as graphs and charts may be printed using the program. ] The template uses a number of factors to calculate the amount of impervious surface for a specific building site. These factors include the following: 1 . The ground floor area of the dwelling; 2 . The area covered by utility structures and uses