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08/22/95 TUE 09:48 FAX WOODWARD CLYDE a1013 <br /> ATTACHMENT #1 <br /> Summary of the Advantages and Disadvantages <br /> Associated with On -site and Regional Stormwater Controls <br /> On -site Facilities <br /> Advantages Disadvantages <br /> • They are usually easy to locate due to • Developers are resistant to devoting a <br /> their relatively small size. significant amount of their land. <br /> • They treat and control stormwater close • Suitability of various controls is site <br /> to its source and can be designed to specific. <br /> target the highest source areas (e.g., <br /> busy parking lots). • Might be difficult to make on -site <br /> detention work without careful <br /> • Provide treatment and flood control in planning using a regional perspective. <br /> upstream areas of a watershed. <br /> • Typically on -site facilities are not <br /> • Burden of cost is most equitably adequately maintained. <br /> distributed according to the cause of the <br /> problem. • A significant amount of resources are <br /> needed for inspections and <br /> enforcement. <br /> Regional Facilities <br /> Advantages Disadvantages <br /> • Regional facilities provide economies • Siting is difficult due to large size, <br /> of scale with respect to construction downstream locations, and permitting <br /> and maintenance. requirements. <br /> • It is easier to monitor and adjust a • May need to acquire private property <br /> regional facility than many on -site which is expensive and may lead to <br /> facilities. takings issues. <br /> • Maintenance is less problematic than • Upstream controls are not provided for <br /> . for on -site controls. flooding and water quality treatment. <br /> • - . detention has been more • If the facility is not maintajed or fails, <br /> successful for flood control than on -site the results have more impact than if one <br /> detention. or two on -site facilities in the same <br /> • <br /> watershed fail. <br /> • Fewer resources are needed for <br /> inspections and enforcement. • It is difficult to obtain the funding <br /> needed as the timing of development is <br /> not well known in advance. <br /> 12 <br />