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HomeMy WebLinkAboutAPPROVED STORM - P_DrainagePlan_Maple_Highlands_Lot3_240912_v2SDSDSDSDSDSDSDSDSD0 GRAPHIC SCALE 453015 1 INCH = 30 FT. SECTION C.2 ON-SITE BMPS 12/12/2016 2017 City of Renton Surface Water Design Manual C-60 FIGURE C.2.4.B SCHEMATIC REPRESENTATION OF A TYPICAL GRAVEL-FILLED DISPERSION TRENCH FOR BASIC DISPERSION MAXIMUM 50-FOOT TRENCH WITH NOTCHED BOARD (SEE FIGURE C.2.1.D) 25-FOOT (MIN.) VEGETATED FLOWPATH SEGMENT 25-FOOT (MIN.) VEGETATED FLOWPATH SEGMENT SIMPLE 10- FOOT TRENCH 24" MIN. MAX 15% SLOPE TRENCH SECTION NTS 3/4" TO 1-1/2" WASHED DRAIN ROCK RIGID PEFORATED PIPE, 4" MIN. DIA. LEVEL OUTLETMAX 20% SLOPE 18" MIN. 6" MIN. = 700 SQ. FT. = 3,500 SQ. FT. SLOPE SMALL CATCH BASIN OR YARD DRAIN TYPE 1 CB PLAN VIEW OF ROOF NTS FLOWPATH SEGMENTS MUST NOT OVERLAP PLAN VIEW OF PARCEL TO STORM DRAINSYSTEMRIGHT- OF-WAYGENERAL NOTES:1.INFILTRATION TRENCHES LIMITED TO ROOF RUNOFF FROM SINGLE-FAMILY OR DUPLEX HOMES OR TO CONTROL BASEMENT FLOODING. CONSULT WA DEPARTMENT OF ECOLOGY REGULATIONS FOR UNDERGROUND INJECTION CONTROL PROGRAM (UIC) FOR OTHER TYPES OF RUNOFF MANAGEMENT.2.IMPERVIOUS AREAS LARGER THAN 10,000 SF AND NON-NATIVE PERVIOUS AREAS LARGER THAN 35,000 SF MAY REQUIRE LARGER PIPE AND SHOULD BE DESIGNED BY A CIVIL ENGINEER.3.THE PERFORATED PIPE MAY NOT BE PLACED IN A CRITICAL AREA BUFFER OR ON SLOPES STEEPER THAN 25%.4.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.24" MIN.18" MIN.MIN. 1' ABOVE SEASONAL HIGH GROUNDWATER TABLE 6" MIN.3/4" - 11/2" WASHED DRAIN ROCK OR GRAVEL BACKFILL FOR DRYWELLS PER WSDOT STD.SPECIFICATION SECTION 9-03.12( 5)NON-WOVEN GEOTEXTILE FOR SEPARATION ON TOP AND SIDES OF TRENCH PER WSDOT SPECIFICATIONS SECTION 9-33.2(1) TABLE 3 COMPACTED TOPSOIL OR OTHER CLEAN FILL 6" DIA. MIN.PERFORATED PVC,SDR 35 PER ASTM D3034 10' MIN. LEVEL TRENCH WITH PERFORATED PIPE, SEE NOTE 1 DOWNSPOUT WITH CLEANOUT FILTER, SEE DETAIL ASECTION A NOTES:1.TRENCH LENGTH TO BE 10 FEET IN LENGTH FOR EVERY 5,000 SF OF CONTRIBUTING IMPERVIOUS SURFACE, OR 35,000 SF OF NON-NATIVE PERVIOUS SURFACE, OR PORTION THEREOF. 5' MIN. 5' MIN.TO STORM DRAIN SYSTEM 5' MIN. 5' MIN. A DOWNSPOUT WITH CLEANOUT FILTER, SEE DETAIL 10' MIN. LEVEL TRENCH WITH PERFORATED PIPE, SEE NOTE 1 CONFIGURATION ON FLAT GROUND CONFIGURATION ON SLOPING GROUND UNDISTURBED NATIVE SOIL CLEANOUT PER STD. PLAN 226. 00 CLEANOUT PER STD. PLAN 226. 00 FILTER SCREEN 2'-5' TO GROUND SOLIDS/ LEAVES TYPICAL DOWNSPOUT FILTER DETAIL FOOTING DRAIN BYPASS CLEANOUT PER STD. PLAN 226. 00 PERFORATED STUB- OUT CONNECTION PUBLIC WORKS DEPARTMENT APPROVED:DATEMartin Pastucha Public Works AdministratorUNLESS OTHERWISE NOTED, DRAWINGISNOTTO SCALE ( NTS)STD. PLAN - 263. 40 DocuSign Envelope ID: A9707D3B-A0EF-441F-8140- 2CDB48E878CA 11/2/2020 | 1:04 PM