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SDSD
GRAPHIC SCALE01530 45
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