HomeMy WebLinkAboutCHILDRENS-THERAPLAY-PH2-SUMMARYKEELER-WEBB ASSOCIATES
Consultlng Engineers Planners Surveyors
TELEPHONE(317) 574-0140 www.kaelerviet-0.mn
486 cradle Dow
Carmel, Indiana 46032
Project 9919TOW EROAD
Subject DRAINAGESUMMARY
Proj. No. 1803d21
Date 812312019 By ALD cu. ALD
MASTER DRAINAGE PLAN AND CALCULATIONS
SECTION I
USING TR55
OVERALL TIME TO PEAK -22 min.
The post -developed runoff pattern is as follows for each ofthe watersheds:
3 - This watershed will sheet flows across the pavement to curb inlet 3. Then the storm water is conveyed by the on -
site storm sewer system and outlets into the existing vePG��ra�ted swale BMP I. Then stormwater continues
downstream and is di exishine Detenua�ond B-BMP 2.
4 - This watershed wiT
sdrpavement, and landscaping islands to curb inlet 4. Then the storm
water is conveyed byer - vegetated swale BMP I. Then
stormwater continues Wsc arge into the existing Detention Pond B-BMP 2.
5 - This watershed wdo of, Cavemen, 'n islands to curb inlet 5. Then the
storm water is Conveyed by the on -site se m and outlets into t u. vegetated swale BMP I.
Then stormwater continues downstream an Game a existine Detention Pond B-BMP 2.
6 - This watershed will sheet flaws across the roof, par a e d 1 ndscaj
storm water is conveyed by the on -site storm sewer system an n ets into
Then stormwater continues downstream and is discharged into the e
9 - This watershed will sheet flaws across the roof, pavement, and landscal
shorn water is conveyed by the on -site shorn sewer system and outlets into
Then stormwater continues downstream and is discharged into the existing
SUMMARY
COMBINED AREAS
STORM DURATION 100-YEAR
RATIONAL METHOD 9.03 cfs
RELEASED FOR CONSTRUCTION
Subject to compliance with all regulations
of State and Local Codes
City of Camel
DATE: 10/30/19
to curb inlet 6. Then the
; vegetated swale BMP I
'and B - BMP 2.
to curb inlet T Then the
; vegetated swale BMP I.
'ond B - BMP 2.
SECTION 2
STORM SEWER SIZING
SEE THE STORM SEWER REPORT FOR PIPE CAPACITY, HOT, AND AMOUNT OF FLOW IN EACH PIPE
RUN FROM STRUCTURE TO STRUCTURE.
ALL ROOF DRAINS DISCHARGE TO PAVEMENT AND ARE CAPTURED BY ON -SITE PRIVATE STORM
SEWER
SECTION 3
DETENTION
SEE THE ORIGINAL STORM DETENTION CALCULATIONS FOR THE ORIGINAL TREESDALE
SUBDIVISION.
THE CHILDRENS THERAPLAY SITE OCCUPIES ALL OF THE AREA SHOWN AS 17-21, WHICH FLOWS
THROUGH 400 AND 4 I THEN DISCHARGES INTO COM B (DETENTION POND B).
PER THE CHART ON SHEET C2 OF THE CONSTRUCTION DOUCMENTS THE PROPOSED IMPERVIOUS
AREA BY DESIGN COVERS AN AREA WHICH IS 172 sTft. LESS THAN THE PRE-EXISTING
CONDITION. BECAUSE OF THIS SMALL AMOUNT THE CN VALUE HAS NOT CHANGED FROM THE
PRE-EXISITNG CONDITION TO THE PROPOSED CONDITION.
SECTION 4
WATER QUALITY
THERE ARE 2 EXISTING WATER QUALITY BMPS PROVIDED ON THE PROPERTY AS A PART OF THE
ORIGINAL STORM WATER DETENTION SYSTEM. BMP 1 IS A PROPOSED INFIL IRA TION TRENCH
THAT IS IN BETWEEN THE STORM OUTFALL FOR PHASE 2 AND THE EXISTING STORM SEWER
CONNECTION AT THE END OF THE STUB STREET FOR TREESDALE SECTION 1. BMP 2 IS
DETENTION POND B FOR THE SOUTH SIDE OF TREESDALE SUBDIVISION WHICH INCLUDES THE
CHILDRENS THERAPLAY SITE. THE COMBINATION OF THESE 2 BMPS WILL PROVIDE SUFFICIENT
WATER QUALITY STANDARDS. THERE IS ALSO ANOTHER DETENTION POND A ON THE
TREESDALE SUBDIVISION WATERSHED AREA WHICH WOULD BE A 3`° BMP (ALTHOUGH IT IS NOT
IN -LINE WITH THE OTHER TWO BMP's.).
WATER QUALITY VOLUME CALCULATIONS
WQI (P) (Rv) (A) / 12
P=I.Oiwh
RELEASED FOR CONSTRUCTION
Sv*utto compliance with all regulations
of State and Local Codes
City of Camel
DATE: 10/30/19
RESTRICTED OUTLET1100-YEAR OVERFLOW ELEV 860.94,
TOTAL REQUIRED FORE BAY VOLUME 0.011 Ac.-FL
FOREBAY VOLUME PROVIDED -0.011 Aa-Ft. = (BOTTOM=858.34; CREST of FORERAY@
ROCK CHECK DAM = 8sv.84 )
DESIGNREQUIREMENTS
• <5Aa
• Existing soilpermeability>0.3 in
• WQV calculated as above using contour elevations to determine volume and typical crushed
stone porosity (storage capacity in below grade stone)
• Vegetation specked as Tall Fescue on details and notes
• End -.Section & rip -rap for energy dissipation provided
• Basin will drain in < 24 hours
• 25'Bujper zone provided in INGRESSIEGRESS BMPDRAINAGE EASEMENT, no known
wells within 100' oflnffl&Wson Trench
• Access to Infikrmion Trench by on she tractors/e0uipment is easily accessible
• Freeboard set at pavement grade over RCP outlet pipe
• Rock Check Dam near the outlet sets storage volume height
• Bottom oflnfiltration Trench above ground water table
• Will remove TSSfor E.colifrom the use on the property
• Emergency spilhvay will be conveyed by existing storm sewer which discharges to the existing
wet detention pond
• 8' flm bottom Swale with 4.,1 side slopes
RELEASED FOR CONSTRUCTION
Subject to compliance with all regulations
of State and Local Codes
City of Carnal
DATE: 10/30/19