Ordinance No. 20369 - Laserfiche WebLink

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(2) The amendments are consistent with applicable provisions of the Metro Plan and applicable adopted refinement plans. The proposed code amendments add regulations to the Land Use Code with the intent of protecting life and property from flood and drainage hazards, reducing the impacts that urbanization is having on the City's water quality, protecting waterways in the headwater areas from erosive effects of increases in stormwater runoff, protecting the City's stormwater system from oil and grease from stormwater runoff, and preventing stormwater pollution by eliminating pathways that may introduce pollutants into stormwater. Generally, the stormwater development standards fall into the following five categories: 1. EC 9.6790, Stormwater Destination, applies to all new development and redevelopment and is intended to protect life and property from flood and drainage hazards by maintaining the capacity of the City's stormwater conveyance system through the establishment of destination regulations for stormwater runoff from development. This provision requires applicants proposing new development to submit documentation showing the stormwater destination into which the development will be disposed. The documentation must establish that the existing stormwater drainage facilities into which the stormwater from the proposed development will dispose has the capacity to handle the stormwater runoff that will be generated by the proposed new development for the flood control design storm. If the applicant cannot establish that existing stormwater drainage facilities have such capacity, the applicant must construct new storm drainage facilities to accommodate the stormwater draining from the proposed development. 2. EC 9.6791, Stormwater Pollution Reduction, applies to land use applicants requesting approval of a cluster subdivision, a conditional use, a partition, a planned used development, site review, or a subdivision tentative plan and is intended to reduce the impacts that urbanization is having on the City's water quality by providing standards for the capture and treatment of stormwater runoff from development. This provision requires that applicants include pollution reduction facilities selected from the Stormwater Management Manual that treat all of the stormwater runoff from the development site that will result from the water quality design storm. The pollution reduction facilities must be sited, designed and constructed according to the Manual and must be designed using one of the three methodologies outlined in the Manual. 3. EC 9.6792, Stormwater Flow Control, applies to all land use applications for development sites in the headwaters area requesting approval of a cluster subdivision, a conditional use, a partition, a planned used development, site review, or a subdivision tentative plan and is intended to protect waterways in the headwaters area from the erosive effects of increases in stormwater runoff peak flow rates and volumes resulting from development. The provision requires that applicants demonstrate, using methodology in the Stormwater Management Manual, that peak rates of flow delivered to an existing open waterway at a point above 500 feet in elevation will not increase during storms larger than the water quality design storm and smaller than the flood control design storm as a result of the development. The facilities to control the rate of stormwater runoff must be sited, Exhibit A to Ordinance No. 20369 Findings of Consistency