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STORM DRAINAGE PLAN
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I M PERVIOUS CALCU LATIONS
IMPËRVIOUS COVERAGE 8773.63 I 16,251.27 sÎ = 540'6
existing removed addition total
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building:
impeMoous deck:
sport court:
driveway:
patios / walkways:
overhang not over
impervious surface
2,463 sf
695 sf
1,782sf
1,435 sf
1,554 sf
185 sf
106 sf
0sf
1,782 st
1,435 sÍ
1,554 sf
0sf
1644.63 sf
104 sf
0sf
2,556 sf
995 sf
75 sf
4,213.63 sf
749 sf
0sf
2,556 sf
995 sf
260 sf RES
JANOS8,114 sf 4,877 sÍ 5,375.63 sf 8773.63 sf
NEW AMOUNT OF IMPERVIOUS SURFACË: 8773.63 sf - 8114 sf = 659.63 sfBtPÐan LllT
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yard drain with oill
separator
#4 epoxy coated
rebar, U-shaped with
30" embedment @ 8'
o.c.
4" Ø solid schedule
4O pvc pipe, primed
and glued
diffuser - 4'Ø
perforated pvc
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M.P. 19.275
existing drainage
swale
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DITCH
edge of existing
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pipe
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rebar, bent to pipe
shape with 30" min.
embedment
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DIFFUSER DETAIL
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DIFFUSER DETAIL - Section
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ballast around the
pipe and around
the ends for erosion
control - place on
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outlet inlet
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24" x 24" HÐPE grate
W structural foam
and UV inhiþitor
4" universal styrene
outlets
4" Ø schedule 40
solid PVC pipe
24" x 24" x 24' HÐPE
one piece tapered
catch basin W
structuralfoam SHEET:
SHËET 3OF3
3
ENTsYARD DRAIN
1
ballast around the pipe and around
the ends for erosion control - place
le fabricon geotexti
below
area to out and
lined with geotextile
fabric - depth 6" min
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