HomeMy WebLinkAbout243.00<
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MAINTENANCE ACCESS ROAD
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(MODULAR GRID PAVEMENT
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POROUS PAVEMENT, ASPHALT,
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CONCRETE OR GRAVEL) FOR
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VEHICLE ACCESS
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FLOW SPREADER
MID-SWALE
FLOW SPREADER J ,J , ROADWAY LENGTH DEPENDS ON
(RECOMMENDED) T4,
. 1�`J SWALE AREA (SEE NOTE)
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BIOFILTRATION SWALE BOTTOM '41J,
(MIN. SWALE LENGTH = 100 FT.) `J�,,
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NOTE: Longitudinal slope 1-6%. PLAN
Provide underdrain for slopes < 1.5%.
UNDERDRAIN FOR SLOPES < 1.5%
SOIL AMENDED WITH COMPOST
SWALE BOTTOM
PERFORATED UNDERDRAIN
PIPE CENTERED BENEATH SWALE
8' MINUS CLEAN DRAIN ROCK
FILTER FABRIC
NOTE: Underdrain must infilitrate or drain
freely to an acceptable discharge point.
SWALE DIVIDER FOR WIDTH >10 FT
WATER QUALITY DESIGN DEPTH (Y) = 4" MAX.
(2" FOR FREQUENTLY MOWED AREAS)
Y+1
MIBOTTOM WIDTH = (B)
X. = 16 FT+DIVIDER WID H
MIN. =2FT
TYPICAL SWALE SECTION
2" COMPOST TILLED INTO
6" NATIVE SOIL
FILTER FABRIC WRAP OF TOP, SIDES AND BOTTOM
6" MIN. AMENDED SOIL
O G 6, MIN. OVER PIPE
PERFORATES PIPE UNDERDRAIN
ao ^ CENTERED BENEATH SWALE
ORIGINAL SOIL
DETAIL A
Gti� BIOFILTRATION SWALE SCHEMATIC
Y STD. PLAN — 243.00
PUBLIC WORKS DEPARTMENT CROSS SECTION AND UNDERDRAIN
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DETAIL MARCH 2008