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EXISTING POND INFO.
N.P. = 892.00
10 YR. = 894.20
100 YR. = 895.24
OVERFLOW = 896.80
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Know what's below.
before you dig.Call
R
STEVEN SCOTT RUCKER P.E. 11300279
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DRAINAGE SUMMARY
1.PROJECT INTRODUCTION:
a.PROJECT LOCATION: PART OF THE SOUTHWEST QUARTER OF SECTION 6,
TOWNSHIP 17 NORTH, RANGE 3 EAST IN CLAY TOWNSHIP, HAMILTON
COUNTY,INDIANA, DETAILED LAND DESCRIPTION SEE SURVEY. LAT 39°56'45"W
LONG 86°14' 26"N.
b.PROJECT DESCRIPTION: THE PROJECT IS A PROPOSED COMMERCIAL
DEVELOPMENT (1.15 ACRES). THE CONSTRUCTION WILL CONSIST OF A
COMMERCIAL BUILDING (CREDIT UNION), ASPHALT PARKING, CONCRETE ATM
PAVEMENT, UTILITY EXTENTIONS, AND STORMWATER MANAGEMENT.
c.THE PROJECT IS PART OF THE MICHIGAN ROAD RETAIL DEVELOPMENT. THE
INTRODUCTION AND NARRATIVE OF THE MASTER STORMWATER REPORT IS
ATTACHED IN APPENDIX SECTION 5 OF THE EVERWISE STORMWATER
TECHNICAL REPORT. INDICATED BY THE MASTER STORMWATER REPORT, THE
REGIONAL DETENTION WILL HANDLE THE RUNOFF FROM THE FUTURE RETAIL
SITES (INCLUDING THIS PROJECT SITE) AND WAS SIZED BASED ON cn EQUALS
92.5. THEREFORE, THE CONTROL FACTOR OF DESIGING THE STORMWATER
SYSTEM FOR THIS PROJECT SITE IS TO ENSURE THE CN VALUE IS LESS OR
EQUAL TO THE PRE-ASSUMED CN.
d.SINCE THE PROJECT SITE IS LESS THAN 5.0 ACRES, THE STORMWATER
ANALYSIS PRODUCED IS RATIONAL METHOD, EVALUATION 2-YR, 10-YR, AND
100-YR FOR EXISTING CONDITIONS; 10-YR AND 100-YEAR FOR
POST-DEVELOPED CONDITION.
2.SITE STORMWATER DISCHARGE AND DOWNSTREAM RECEIVER:
a.PRE-DEVELOPEMENT DISCHARGE: Q2 = 1.844 CFS, Q10 = 2.478 CFS, Q100 =
3.632 CFS.
b.POST-DEVELOPMENT DISCHARGE: Q10 = 4.011 CFS, AND Q100 = 5.978 CFS.
3.FLOODPLAIN AND FLOOD HAZARD INFORMATION:
a.PER THE EVERWISE STORMWATER TECHNICAL REPORT, THE PROJECT SITE IS
LOCATED IN THE ZONE X, i.e. NO FLOOD PLAIN OR FLOOD HAZARD WITHIN THE
PROJECT SITE RANGE.
4.STORMWATER DETENTION:
a.STORMWATER DETENTION AND RESTRICTED RELEASE WILL BE PROVIDED BY A
LARGE DETENTION BASIN ON THE ARIA DEVELOPMENT SITE. THIS DETENTION
WILL STORE WATER FOR THE MULTI-FAMILY DEVELOPMENT AND THE MICHIGAN
ROAD RETIAL SITE DEVELOPMENT WHICH INCLUDES THE PROPOSED
EVERWISE CREDIT UNION SITE. THE RUNOFF CURVE NUMBERS FOR THE
PROPOSED EVERWISE CREDIT UNION SITE IS 87.61. THE DETENTION SIZING
CALCULATIONS ASSUMED A RUNOFF CURVE NUMBER OF 92.5 FOR THIS
COMMERCIAL DEVELOPMENT. PLEASE REFER TO THE "STORMWATER
TECHNICAL REPORT FOR MICHIGAN ROAD SITE" WHICH WAS APPROVED FOR
THE ARIA DEVELOPMENT AND MICHIGAN ROAD RETAIL DEVELOPMENT FOR
MORE DETAILS ON THE DETENTION SIZING AND RELEASE RATE.
DRAINAGE NOTES
1.THE PROJECT SITE IS PRIVATE OWNED. THE GRADING SYSTEM IS DESIGNED FOR
PRIVATE USE.
2.THERE IS NO 100-YEAR FLOODPLAINS, FLOOD WAY FRINGES, OR FLOODWAYS
WITHIN OR ACJACENT TO THE PROJECT SITE.
ON-SITE DRAINAGE AREAS
101 = 0.28 AC
102 = 0.10 AC
104 = 0.10 AC
TD1 = 0.05 AC
RF1 = 0.01 AC
RF2 = 0,03 AC
RF3 = 0.01 AC
RF4 = 0.03 AC
201 = 0.05 AC
202 = 0.08 AC
203 = 0.09 AC
OFF-SITE DRAINAGE AREAS
ES = 0.09 AC
CB1 = 0.16 AC
CB2 = 0.08 AC