HomeMy WebLinkAbout263.30 (2)GENERAL NOTES:
1.MAXIMUM VEGETATED FLOWPATH SLOPE IS 15% FOR ANY 20-FOOT REACH,
AND MAY NOT EXCEED 20%.
2.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.RIGHT-OF-WAYDRIVEWAY SLOPE
125'120'115'110'105'RIGHT-OF-WAY250'245'240'235'2" TO 4"
ASPHALT BERM DETAIL
PLAN - STEEP DRIVEWAY WITH DIAGONAL BERMS (≥15%)
PLAN - STEEP DRIVEWAY WITH SLOTTED DRAINS (≥15%)
10' MIN.
DISPERSION
TRENCH
DISPERSION TRENCH DETAIL
24'' MIN.
UNDISTURBED
NATIVE SOIL
2'' X 6'' UNTREATED CEDAR OR
RECYCLED PLASTIC BOARD
CRUSHED ROCK OR
GRAVEL
1" DROP
18" MIN.
6" MIN.
3/4" - 1 1/2" WASHED DRAIN ROCK
OR GRAVEL BACKFILL FOR
DRYWELLS PER WSDOT STD.
SPECIFICATION SECTION 9-03.12(5)
6" DIA. MIN.
PERFORATED PVC,
SDR 35 PER ASTM D3034
6'' MIN.
25' MIN.
VEGETATED
FLOWPATH,
SEE NOTE 2
NO OVERLAP
OF
FLOWPATHS
2'x3'x6" MIN. ROCK
PAD, SEE NOTE 3
50' MIN.
VEGETATED
FLOWPATH
10' MIN.
25' MIN.
VEGETATED
FLOWPATH,
SEE NOTE 2
NO OVERLAP OF
FLOWPATH SEGMENTS
25' MIN.
VEGETATED
FLOWPATH,
SEE NOTE 2
6" MIN.
DRIVEWAY SLOPE STREETSLOT DRAIN,
SEE NOTE 4
700 SQ. FT. MAX.
BETWEEN DRAINS, SEE NOTE 1
700 SQ FT MAX.
BETWEEN BERMS,
SEE NOTE 1 STREETDIAGONAL ASPHALT
BERM, SEE NOTE 4
AREA DRAIN,
SEE NOTE 5
NOTES:
1.SEE STD. PLAN ###### FOR ALTERNATE DISPERSION TRENCH IF
CONTRIBUTING AREA EXCEEDS 700 SF. USE 10 LF OF TRENCH WITH
NOTCH BOARD PER 700 SF TO MAX. 50 LF OF TRENCH.
2.IF DISCHARGE IS TOWARD A STEEP SLOPE HAZARD AREA OR A LANDSLIDE
HAZARD STEEPER THAN 15%, VEGETATED FLOWPATH MUST BE 50 FEET.
3.MATERIAL FOR ROCK PAD TO BE 3/4" - 1 1/2" WASHED DRAIN ROCK OR
GRAVEL BACKFILL FOR DRYWELLS PER WSDOT STD. SPECIFICATION
SECTION 9-03.12(5)..
4.SLOT DRAINS OR ASPHALT BERMS MAY BE USED TO DIRECT RUNOFF TO
ROCK PADS OR DISPERSION TRENCHES IN VARIOUS CONFIGURATIONS.
LAYOUTS SHOWN ARE ONLY EXAMPLES.
5.MIN. 12"x12" AREA (YARD) DRAIN. DOWNSTREAM CONNECTED PIPE TO BE
6" DIA. MIN. PVC, SDR 35 PER ASTM D3034, SLOPED AT 1% MIN.
NON-WOVEN GEOTEXTILE FOR
SEPARATION PER WSDOT
SPECIFICATIONS SECTION
9-33.2(1) TABLE 3
25' MIN.
DISPERSION
TRENCH
25' MIN.
BASIC DISPERSION - STEEP SLOPE
DRIVEWAYS
PUBLIC WORKS
DEPARTMENT
APPROVED:
DATEMartin Pastucha
Public Works Administrator
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
STD. PLAN - 263.30
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8/13/2020 | 8:48 AM PDT