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• <br /> • <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL • <br /> • <br /> 8. Guideline for Spacing: • <br /> Slope% Spacing(ft) • <br /> < 5 125 • <br /> 5- 10 100 • <br /> 10-20 75 • <br /> 20-35 50 • <br /> > 35 Use rock lined ditch • <br /> Maintenance Standards = <br /> 1. Periodically inspect right-of-way diversions for wear and after every heavy rainfall for erosion - <br /> damage <br /> 2. Immediately remove sediment from the flow area and repair the dike <br /> 3. Check outlet areas and make timely repairs as needed • <br /> 4. When permanent road drainage is established and the area above the temporary right-of-way • <br /> diversion is permanently stabilized,remove the dike and fill the channel to blend with the natural • <br /> ground, and appropriately stabilize the disturbed area. • <br /> 3.3.5 BMP C204: Pipe Slope Drains • <br /> Purpose <br /> To use a pipe to convey stormwater anytime water needs to be diverted away from or over bare soil to = <br /> prevent gullies,channel erosion,and saturation of slide-prone soils. <br /> Conditions of Use • <br /> Pipe slope drains should be used when a temporary or permanent stormwater conveyance is needed to • <br /> move the water down a steep slope to avoid erosion. See DCSS Drawing#205. <br /> On highway projects,they should be used at bridge ends to collect runoff and pipe it to the base of the fill • <br /> slopes along bridge approaches. These can be designed into a project and included as bid items. • <br /> Another use on road projects is to collect runoff from pavement and pipe it away from side slopes. These • <br /> are useful because there is generally a time lag between having the first lift of asphalt installed and the • <br /> curbs, gutters,and permanent drainage installed. Used in conjunction with sand bags, or other temporary <br /> diversion devices,these will prevent massive amounts of sediment from leaving a project. • <br /> Water can be collected, channeled with sand bags,Triangular Silt Dikes, berms,or other material, and • <br /> piped to temporary sediment ponds. • <br /> Pipe slope drains can be: • <br /> 1. Connected to new catch basins and used temporarily until all permanent piping is installed. • <br /> 2. Used to drain water collected from aquifers exposed on cut slopes and take it to the base of the • <br /> slope. • <br /> 3. Used to collect clean runoff from plastic sheeting and direct it away from exposed soil. • <br /> 4. Installed in conjunction with silt fence to drain collected water to a controlled area. • <br /> • <br /> • <br /> Volume II—Construction Stormwater Pollution Prevention <br /> 3-41 <br /> • <br /> • <br />