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3 . Using detection structures to reduce the rate of runoff <br /> leaving the site . <br /> 4 . Building types , parking layouts , etc . must be selected <br /> and located with respect to the natural topography to <br /> minimize grading and preserve sensitive areas . <br /> 5 . The rate of runoff from the site must not be increased <br /> over pre - development conditions , <br /> 6 . The stormwater management-system-must respect existing <br /> drainage patterns , <br /> 7 . Energy dissipators such as rip rap aprons and other site <br /> features must be used when runoff is collected and <br /> discharged ; e . g . , at downspouts from rooftops and storm <br /> drains at parking areas . <br /> 8 . Conflicts between on - site drainage and other features <br /> must be avoided ; e . g . , drainage across sidewalks or <br /> ponding in parking / service areas , <br /> Water Use Limitations <br /> Because of the size or remaining excess capacity of treatment <br /> plants for some utility providers , uses which require large <br /> quantities of water for manufacturing and / or processing <br /> operations will require the review and approval of the Board <br /> of County Commissioners as a Planned Development . As shown <br /> on the accompanying table , thresholds have been established <br /> for what is considered low water use , and uses which exceed <br /> these thresholds must apply for approval through the <br /> provision of Article 7 , Planned Developments , of the Orange <br /> County Zoning Ordinance . <br />