SW4191202_Detention Pond Design Spreadsheet_1/20/2020

Pond Check State Rev 2020-01-17.gpw
01 /17/20
PERMANENT WET DETENTION
POND DESIGN - RISERIBARREL
Revised 8-24-99
PROJECT:Matcor
Pond 1
INDEX :
17-04
CHECKED BY:
LAH
LOCATION:
Welcome, NC
DATE:
January 17 2020
REVISED:
SITE DATA
TOTAL SITE AREA =
32.11
WATERSHED =
NIA
PROPOSED BUILT UPON AREA =
2.49
CLASSIFICATION: WS -
NIA
FUTURE BUILT UPON AREA =
0.00
GWAIWCA =
N/A
TOTAL ON -SITE BUILT UPON AREA =
2.49
PERCENT BUILT -UPON =
7.75%
ON -SITE DRAINAGE AREA TO POND =
3.38
_
ON -SITE BUA TO POND =
2.49
_
ONSITE % BUA FOR POND SUB -BASIN =
73.67%
OFF -SITE ❑RAINAGE AREA TO POND =
0.00
MAX. OFF -SITE B.U.% =
0%
TOTAL WATERSHED AREA TO POND =
3.38
DISTURBED AREA =
3.38
TEMP. SED. STOR. USED YIN
DESIGN DATA
TEMPORARY SEDIMENT STORAGE
0.5
acre -inch per disturbed acre
PERMANENT SEDIMENT STORAGE
0.125
acre -in per total drainage are
PERMANENT WATER QUALITY
COMPOSITE B.U. % =
73.67
percent
DEPTH minimum 3 feet
3.4
feet (Average Depth)
SAIDA (Figure 5.6-2
2.52
peroent
TEMPORARY WATER QUALITY
1.0
rainfall to be controlled
PRINCIPAL SPILLWAY
TYPE
X
corrugated aluminum
reinforced concrete
DESIGN STORM
10
year
RAINFALL INTENSITY
6.89
inches per hour
RUNOFF COEFFICIENT
0.8
EMERGENCY SPILLWAY
TYPE
X
concrete box
rip -rap lined
DESIGN STORM
100
year
RAINFALL INTENSITY
8.3
inches per hour
RUNOFF COEFFICIENT
0.8
POND DESIGN
TEMPORARY SEDIMENT STORAGE VOLUME
REQUIRED
6135
PERMANENT SEDIMENT STORAGE VOLUME REQUIRED
1534
PERMANENT WATER QUALITY SURFACE AREA RE -D
3710
TEMPORARY WATER QUALITY
STORAGE RE UIRED
Rv=
0.713
VOLUME REQUIRED =
8748
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