SW8120902_COMPLIANCE_20121009

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW�'Daj
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
�9/�loD9
WYYMMDD

INFILTRATION TRENCH ANALYSIS
Filename: S:1WQSlstormwaterlexcel spread sheetslintrench1120902
Project # SW8 120902 Original Run Date:
Project Name The Santuary Date Last Modified 09-Oct-12
Project Area, acres: 8.15 Reviewer
Rules 2008 enter either "2006" or Ph2
Trench 1 Trench 2 Trench 3 Trench 4 Trench 5 Trench 6
Receiving Water UT to Myrtle Grove Sound I I
Classification SA:ORW
Index Number 18-87-27
River Basin Cape Fear
New Buildings, sf= 21000
New Parking/Street, sf; 97817
New Concrete, sf
New Future, sf=
New Offsite, sf= .
New Other, sf =
Old BUA (design storm
_ _0
0
0
0
Total BUA( 118817
Overall Drainage Area 155410
Old Drainage Area 0
Overall % Impervious= 76.5%
#DIV10!
#DIV10!
#DIVIO!
#DIV/01
Pre-dev %impervious
Old DA % impervious #DIVIO!
see note 1
0 jsf, old and
sf, old and
sf
#DIVIO!
�isee note 2
REQUIRED VOLUME CALCULATION
Pre-dev. Rv
0.05
0.05
0.05
0.05
0.05
0.05
Post-dev. Rv
0.74
#DIV/O!.
#DIV/O!
#D_ IV/O!.
#DIV/O!
_#D_IV/O!
1yr 24hr runoff depth
4.04
1yr 24hr pre-dev vol.
2616.07
0.00
0.00
0.00
0.00
0.00
1yr 24hr post-dev vol. ',
38617.62
#DIVIO!
#DIV101
#DIV/O!
#DIVIO!
#DIVIO!
1.5" volume
14338
#DIV/O!
#DIV/O!
#DIVIO!
#DIVIO!
#DIVIO!
SA Ph2 volume
36002
#DIV101
#DIV10!
#DIV10!
#DIV101
#DIV101
SA 2008 volume
36002
#DIV101
#DIV10!
#DIV101
#DIV101
#DIV101
Non -SA volume
#REFI
#REF!
#REF!
#REFI
#REF!
#REF!
TRENCH PARAMETERS AND VOLUME PROVIDED
Pipe 1 Diameter, ft=
1
Pipe 1 Run Length,ft
1410
No. of Pipe 1 Runs
2
Pipe 1 Area,. sf =
(
1,57
0
0
0
0
0
Storage in Pipe 1,cf
2215
0
0
0_
0_
0_ _
Length Of Trench,ft
1563
Width Of Trench,ft
7
Height Of Trench.ft
3
Voids Volume, cf
12243
0
0
0
0
0 j
0
0
0
Volume Provided 14458 0 0
TRENCH ELEVATIONS AND DRAWDOWN TIME
Bottom Elevation 25.25
SHWT Elevation 22.17
Overflow Elevation 27.25
Infiltration Rate,inlhr 20
SA @Bottom , sf j 10941- _ - ` 0 _ . 4 _ .0 _ 0
Drawdown, hrs. 1.97 #DIV101 #DIV101 #DIV101 #DIV101 #DIV10!
10 YEAR 24 HOUR OPTION
Runoff Depth, in.
Runoff Volume, cf
Vol. Inf. in 24 hrs.
Volume to be stored
Sufficient trench vol?
0.00 #DIVIO!
#DIVIO!
#DIV10!
#DIV10!
#DIVIO!
218820 0
0
0
0
0
-218820.00 #DIV101
#DIVIO!
#DIVIO!
#DIVIO!
#DIV101
'ES #DIVIO!
#DIVIO!
#DIVIO!
. #DIV/O!
#DIV101
overwrite if t
inches, from
2008 and Pt
From NOAA
at 1/2 of the