Storm Sewer System - Laserfiche WebLink

New Search

08/22/95 TUE 09:39 FAX WOODWARD CLYDE CjO03 Historically, jurisdictions have focused on addressing drainage and flood control objectives associated with new development. For example, Eugene has employed a conventional, conveyance -based stormwater system where the goal has been to quickly and efficiently convey runoff away from the urban area and into receiving waters. To address related water quality and habitat problems in local rivers and streams and to meet recent Clean Water Act requirements (i.e., NPDES permit requirements), jurisdictions are now focusing their attention on water quality protection and restoration in addition to peak flood control. The City of Eugene is initiating a process for developing new water quality based drainage and design standards. These standards will be developed and implemented to partially meet the City's recently adopted policy for managing stormwater (outlined in the Comprehensive Stormwater Management Plan - CSWMP). The CSWMP incorporates multiple objectives for managing stormwater, including flood control, water quality improvement, and the management of natural resources that perform stormwater functions. The City also has a National Pollutant Discharge Elimination System (NPDES) stormwater permit which requires the City to address stormwater management issues related to water quality. One of the specific NPDES permit conditions (Best Management Practice # P &A7) requires the City to "create (or improve), implement, and enforce water quality based drainage and design standards for new development ". As the City of Eugene begins the process of creating standards for new development, the following questions will need to be addressed: 1) What will the City's policy be with respect to the use of on -site and/or regional facilities for drainage and water quality control ?; 2) What are the levels of water quality and quantity control that should be required (e.g., a specific percentage reduction in pollutants, a specific reduction in peak flows, etc.) and how should they be applied so that the scale of the requirement is consistent with the extent of the problem ?; 3) How should requirements be specified (e.g., should standards be based on performance, or should they be based on whether or not specific best management practices are implemented) ?; and 4) How should a program be administered to implement the standards in . Eugene (e.g., are inspectors needed, who will be responsible for maintenance, etc.)? This memo was prepared to address the first issue listed above (the u of on-site P P regional controls) and is organized as follows: Section 2.0 provides a description of the difference between on -site and regional controls for drainage and stormwater quality, Section 3.0 provides a summary of the issues that need to be considered with respect to the use of on -site and/or regional controls, Section 4.0 provides a list of municipal program options which incorporate the use of on -site and/or regional controls, and Section 5.0 provides a description of the staff - recommended approach for the City of Eugene.