SW6191002_CG102_12/17/2019

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GRADING & STORM DRAINAGE NOTES:
1. TOTAL DISTURBED AREA = 2.59 AC.
2. REFER TO CG501 AND CG512 FOR STORM DRAINAGE STRUCTURES DETAILS.
3. 10-YR PEAK FLOW RATES WERE CALCULATED USING THE RATIONAL METHOD.
4. CONTRACTOR SHALL GRADE THE SITE AS SHOWN AND REPORT ANY ISSUES TO
THE SITE ENGINEER.
5. CONTRACTOR SHALL GRADE ALL AREAS TO TRANSITION APPROPRIATELY AND
TIE IN TO THE EXISTING GRADE.
6. ALL EXCAVATION SHALL BE PERFORMED SO THAT THE SITE AND THE AREA
IMMEDIATELY SURROUNDING THE SITE WHICH AFFECT OPERATIONS SHALL BE
CONTINUALLY AND EFFECTIVELY DRAINED DURING ALL PHASES OF
CONSTRUCTION.
7. ALL STORM DRAINAGE PIPES SHALL HAVE THEIR JOINTS WRAPPED WITH FILTER
FABRIC. FILTER FABRIC SHALL EXTEND 1 FOOT PAST THE JOINT. FILTER FABRIC
SHALL HAVE AN OVERLAP OF 18 INCHES.
8. ALL EXISTING MANHOLES WITHIN THE LIMITS OF CONSTRUCTION SHALL BE
RAISED OR LOWERED TO MATCH THE NEW FINISHED GRADES.
9. TRENCH BOXES SHALL BE USED TO INSTALL STORM DRAINAGE LINES AROUND
EXISTING TREES TO REMAIN. NO FILL FROM THE EXCAVATIONS SHALL BE
STOCKPILED WITHIN THE DRIP LINE OF THE TREES TO REMAIN.
10. EXISTING STORM DRAINAGE PIPE TO BE KEPT SEPARATE FROM NEW STORM
DRAINAGE NETWORK.
11. THE SITE SHALL BE GRADED TO PROVIDE POSITIVE DRAINAGE AWAY FROM ALL
NEW BUILDINGS AND SITE STRUCTURES.
12. ROOF/FOUNDATION DRAIN COLLECTORS SHALL BE SIZED AS SHOWN ON CG
PLANS. ALL ROOF/FOUNDATION DRAINS AND COLLECTORS SHALL HAVE A
MINIMUM 1.00% SLOPE. ROOF DRAINS SHALL HAVE A MINIMUM 1.0 FT OF COVER
AND FOUNDATION DRAINS SHALL HAVE A MINIMUM OF 2.42 FT OF COVER.
13. CLEANOUTS SHALL BE PROVIDED ON ALL ROOF DRAINS WHERE THE PIPE MAKES
A TURN OF 45 DEGREES OR SHARPER.
*SEE HYDROLOGY REPORT FOR DETAILED CALCULATIONS.
**SCS METHOD USED FOR TOTAL AREA TO BE DIRECTED TO AND DRAINED FROM
BIORETENTION CELL AND DETENTION POND. SEE HYDROLOGY REPORT FOR MORE
DETAILS.
DRAINAGE INFORMATION*
DRAIN #
STRUCTURE
DRAINAGE
10-YR PEAK
NAME
AREA (AC.)
FLOW (CFS)
10
Al -D1
0.69
4.64
O2
A3-DI
0.04
0.27
O3
A4-DI
0.21
1.58
O4 * *
C1-OCS
1.30
0.72
O5 * *
D1-OCS
1.49
0.08
O6
FLUME
0.13
1.02
DRAINAGE AREA
BASIN #
DRAINAGE
AREA (AC.)
BUILT -UPON
AREA (AC.)
PERVIOUS
AREA (AC.)
CURVE
NUMBER (CN)
1❑
1.33
0.67
0.66
77
2❑
0.21
0.00
0.21
60
3❑ (BYPASS)
0.29
0.01
0.28
62
® (BYPASS)
0.59
0.41
0.18
88
5❑ (BYPASS)
0.09
0.01
0.08
70
©
(BYPASS)
0.06
0.06
0.00
98
LEGEND
CB
CATCH BASIN
COO
SANITARY CLEAN -OUT
DI
DROP INLET
FFE
FINISHED FLOOR ELEVATION
✓e
JUNCTION BOX
NEW CONTOUR
280
-------281 ------
EXISTING CONTOUR
282 X
SPOT ELEVATION
PVMT. MATCH LINE
EXISTING DRAINAGE PIPING
EXISTING DROP INLET
NEW DRAINAGE PIPING
®
NEW DROP INLET
LIMITS OF CONSTRUCTION
- - - - - - -
- - CATCHMENT AREAS
NEW CONCRETE
a
UNCLASSIFIEDHFOR OFFICIAL USE ONLY 7 8 9 10
5 6
MATCHLINE MATCHLINE
SEE THIS SHEET ,.1" s SEE THIS SHEET
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/0- .3 01 \ / 23p c CLEANOUTS (4) TO BE PLACED EVERY \ \ \ \ _ EX -DI
/ 22g 10' ALONG LENGTH OF UNDERDRAIN (MISSING LID)
STORMWATER 22600 TOP: 233.16
D1 INV- 229.76 \ \ / \ \\ t STORM C -OCS MANAGEMENT M \\ \\ \� �/ \ �`
POND �06 JF _ - 232-
EX -DI 2j
(FULL OF WATER)
CONNECTING PIPES
UNDETERMINED(D2 HW
RIPRAP INFORMATION
RIPRAP
ID
APRON WIDTH @
PIPE OUTLET (FT)
APRON WIDTH AT
OUTLET END (FT)
MAX. STONE
DIAMETER (FT)
APRON THICKNESS
(FT)
4.5
6.0
0.75
1.125
©
4.5
6.0
0.75
1.125
©
6.0
5.6
0.75
1.125
�D
6.0
8.0
0.75
1.125
220
1 25' x 16' DETENTION POND
216 EMERGENCY OVERFLOW,
STUDY PT. #1 SEE DETAIL CG501
e ^ STUDY PT. 3,�
✓ �� � //� � 230 - -100' WETLANDS
BUFFER
BUILDING
3042
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STORM DRAINAGE PLAN
SCALE: 1" = 30'
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- _ WETLANDS BDY
HEADWALL
TOP: 216.70'
INV.' 213.28'
100-
_-00 100 N LOWE ENGINEERS, LLC.
100 REG. # P-1582
30 0 30 60 90
GRAPHIC SCALE: 1 INCH = 30 FEET
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US Army Corps
of Engineers
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SHEET ID
CG102
UNCLASSIFIEDHFOR OFFICIAL USE ONLY
READY TO ADVERTISE