Laserfiche WebLink
MR #4: Preservation of Natural Drainage Systems <br />Natural drainage patterns shall be maintained, and discharges from the project site shall occur at the natural <br />location. This Minimum Requirement has two main components to achieve: 1) maintain the natural on -she <br />drainage pattern and concentrated discharge location at the downstream property boundary, and 2) prevent <br />erosion at and downstream of the discharge locations. This requirement includes maintaining or replacing <br />systems which convey mnoff accross the site from upstream areas. All ouffalls require energy dissipation. <br />Task 1: Document existing and proposed drainage patterns and discharges <br />Check the boxes that apply below: <br />❑ This site has existing drainage systems or curtails. These items are shown on the <br />Stormwater Site Plan provided in MR 81 and are to include: type, slope, dimensions, <br />channel lining, direction of flow and buffer. <br />N This project will not after the existing drainage system in any way. if the existing <br />outfall(s) show sign of erosion and scour, energy disipation measures will be installed <br />or improved upon. Construction activity of any kind will not occur within at least 10 ft <br />of the edge of the channelized flow, BMP C102: Buffer Zones will be implemented <br />during the life of the project to include visible flagging or other demarcation technique. <br />If this requirement is not met a Hydraulic Project Approval (HPA) may be required from <br />the Washington Department of Fish and Wildlife. <br />In The site does not have any existing drainage systems or outfalls. <br />Descrhe how stormwater will be discharged from the site without causing erosion and <br />flooding downstream: <br />This project does not propose to alter the existing hydrology or <br />hydraulic characteristics. Waters will infiltrate and or runoff with the <br />same characteristics as the existing condition. <br />❑ The existing concentrated drainage system traversing the property will be impacted as <br />part of this project and is shown on the stormwater site plan. <br />Describe how your project impacts or changes the existing drainage systems as a result <br />of your project and how you will address it: <br />City ofEveren Park works <br />Small Pmlect Stormwater are Plan Report Dec 2019 <br />