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OXGRE.EN RAC[_
H;OVIEOVVNEK`S ASSOC.
DRAINAGE SUMMARY - SOUTH BASIN
BASIN AREA
AREA (AC.)
PERMEABLE
IMPERVIOUS
AREA-POST
CN
(PRE-POST)
PRE -DEV
10 -YR (CFS)
F
PAVEM €NT
PERM. PVMT.
REQUIRED (SF)
1.88
1.54
1.53
EXIST. STORM SEWER
10.40
14.93
10,500
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DRAINAGE SUMMARY - SOUTH BASIN
BASIN AREA
AREA (AC.)
IMPERVIOUS
AREA-PRE
IMPERVIOUS
AREA-POST
CN
(PRE-POST)
PRE -DEV
10 -YR (CFS)
POST -DEV
100 -YR (CFS)
DETENTION VOL.
REQ'D (CF)
PERM. PVMT.
REQUIRED (SF)
1.88
1.54
1.53
92
10.40
14.93
10,500
12,000
* ASSUMES 24" STONE DEPTH WITH 40% VOID VOLUME FOR STORAGE RESERVOIR
EXISTI NG
OUTLET PIPE
STORMWATER MANAGEMENT APPROACH
mm"m
THE NORTHERN AND SOUTHERN LAND DISTURBANCE AREAS WILL BE REDEVELOPED IN ACCORDANCE WITH
THE CITY OF CARMEL'S STORMWATER ORDINANCE REQUIREMENTS FOR THE PROVISION OF DETENTION AND
POST - CONSTRUCTION TREATMENT OF RUNOFF. PER THE CITY'S REDEVELOPMENT POLICY, DETENTION WILL
BE PROVIDED TO RELEASE THE POST - DEVELOPED 100 -YEAR STORM EVENT AT THE PEAK 10 -YEAR
PRE- DEVELOPMENT RATE. IN LIEU OF THE PROVISION OF TWO POST - CONSTRUCTION BMP'S IN SERIES FOR
THE NORTHERN AND SOUTHERN REDEVELOPMENT AREAS, A SINGLE BMP FOR EACH OF THESE AREAS WILL
BE PROVIDED TOGETHER WITH A THIRD BMP TO TREAT PRESENTLY UNTREATED RUNOFF FROM THE
CENTRAL PORTION OF THE SITE WHICH WILL REMAIN UNDISTURBED BY THIS PROJECT. THE APPROACH
DEPICTED WITHIN THESE DEVELOPMENT PLANS RELIES UPON A LOW IMPACT DEVELOPMENT (LID) STRATEGY
UTILIZING PERVIOUS PAVEMENT AND BIORETENTION ISLANDS WITHIN PORTIONS OF THE EXISTING AND
PROPOSED PARKING LOTS TO TREAT AND DETAIN RUNOFF. THE DEVELOPER RESERVES THE RIGHT TO
EMPLOYEE A CONVENTIONAL DESIGN APPROACH TO DETENTION AND TREATMENT VIA UNDERGROUND
CHAMBERS AND MECHANICAL STORMWATER QUALITY TREATMENT UNITS (SQTU'S) IF PREFERRED. IF A
CONVENTIONAL APPROACH IS EMPLOYED, EQUIVALENT STORAGE WILL BE PROVIDED IN CHAMBER SYSTEMS
WITHIN THE NORTHERN AND SOUTHERN REDEVELOPMENT AREAS WITH TREATMENT PROVIDED BY SQTU'S
BASED UPON THE WATER QUALITY FLOW RATE FOR EACH AREA. A THIRD SQTU WILL THEN BE PROVIDED TO
TREAT PRESENTLY UNTREATED RUNOFF FROM THE CENTRAL PORTION OF THE SITE TO REMAIN
UNDISTURBED.
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BASIN AREA
AREA (AC.)
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W W
CN
(PRE-POST)
PRE -DEV
10 -YR (CFS)
POST -DEV
100 -YR (CFS)
DETENTION VOL.
REQ'D (CF)
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1.98
a
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92
10.96
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11,000
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EXISTING
OUTLET PIPE
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W`u
LV
DRAINAGE SUMMARY - NORTH BASIN
BASIN AREA
AREA (AC.)
IMPERVIOUS
AREA -PRE
IMPERVIOUS
AREA - POST
CN
(PRE-POST)
PRE -DEV
10 -YR (CFS)
POST -DEV
100 -YR (CFS)
DETENTION VOL.
REQ'D (CF)
PERM. PVMT.
REQUIRED (SF) "
1.98
1.68
1.55
92
10.96
15.72
10,000
11,000
* ASSUMES 24" STONE DEPTH WITH 40% VOID VOLUME FOR STORAGE RESERVOIR
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.lob No. 12016L
a
No.
PE195M
STATE 01
O,n �
'� �n NgANP
� l3
•,,;,s�ONAL
Date: March 16, 2
Scale:
1 " =40'
Title:
STORMWAT
MANAOEME
PLAN
Sheet:
c5c