Corning CEPI - 190108 Project approach-calculations-supports docs

 
1919 South Boulevard, Suite 200
Charlotte, North Carolina 28203
M 704.905.0530 | D 704.780.4972
[e-mail] | www.civilbanks.com
CORNING EMPLOYEE PARKING IMPROVEMENTS (CEPI)  
PROJECT DESCRIPTION & STORMWATER APPROACH 

January 8, 2019 

RE: Corning CEPI – Phase II Stormwater compliance 

Project Description 
The Corning Concord Facility is located in Cabarrus County, NC near the town of Midland at 14556 US‐601 
Midland, NC.  The campus was originally designed and constructed circa 1996 and encompasses 
approximately 234 acres with Tax ID of 55435780680000 & 55434413150000.  Prior to construction, this 
site was a non‐paved landing strip.  
Increased overall plant production has subsequently required additional employees.  To accommodate 
the additional workers, Corning plans to follow through with original 1996 design intent and construct a 
+/‐ 400 space surface parking lot (a.k.a. Craft Parking Area) with expansion potential to +/‐ 600 spaces.  In 
addition, existing parking area near main entrance will be reconfigured to resolve drainage issues as well 
as increase circulation/parking efficiency.   
During original plant construction, four (4) stormwater facilities were installed – two (2) wet ponds on the 
south end and two (2) dry detention basin to the north.  The proposed parking lot area drains to one of 
the existing north dry detention basins and has been identified as Basin‐4 (or Northeast Detention 
Facility). Unfortunately, per discussions with Corning, it appears as though the original design calculations 
have been lost but a 2001 Stormwater Pollution Prevention Plan was located that shows proposed parking 
area ‐ see “Original SWPPP from 2001” exhibit. In addition, as of +/‐ 2007, this site falls under Stormwater 
Phase II regulations.  
Due to the absence of original design calculations, reverse engineering of existing detention facility ‐4 will 
be necessary for verification that required stormwater targets have been met.  The following is a detailed 
breakdown of stormwater calculation approach. 
Stormwater Calculations 
Phase II regulations vary depending upon % of Built‐Upon‐Area (BUA) and are divided into two categories: 
high and low density.  Low density for this particular site is defined as BUA < 24%.  To facilitate this 
calculation, current 2018 impervious areas were compared to 2001 aerial imagery to determine if 
additional impervious areas were added after Phase II adoption – see “Impervious exhibit with 2001 
aerial”.  Based on this comparison, no significant impervious additions are evident.  Subsequently, BUA 
calculations will be based on proposed new impervious for +/‐400 space lot as well as future expansion.  

Using allowable deduction of existing BUA from total project area this yields a BUA of 4.2% which classifies 
as Low Density – see “C8‐1 Impervious Inventory” exhibit with Phase II calculation summary highlighted.  
Per Low Density requirements, one of the primary objectives is to utilize vegetated conveyances.  For 
compliance as well as reduced piping costs, the original design intent was to capture parking area runoff 
and discharge on the south side into a vegetative swale running parallel with existing access road flowing 
north to existing detention facility.  Unfortunately, due to extremely flat conditions (0.7%) and inadequate 
pipe cover at drive connection, using vegetative conveyance is not viable.  See “Detention‐4 Drainage 
Area” exhibit for additional notes and graphic summary of constraints as well as “Grading overall” exhibit 
for proposed storm layout.  
For verification that existing facility will effectively mitigate 2 & 10 year peaks, 1995 aerial imagery prior 
to plant construction was utilized to determine pre‐development ground cover.  Post‐development 
condition, time of concentration calculations as well as soils information and pre‐developed topography 
via USGS map are also included with calculations. Calculated sheet flow at most remote point is the same 
in both pre and post condition. However, a post‐condition TOC of +15 minutes did not seem appropriate 
and has been reduced to 10 minutes for calculation purposes.  
The existing detention facility has two outlet structures: a primary 18” RCP culvert and secondary 10’ wide 
concrete paved broad‐crested emergency spillway.  Final hydraulic analysis included in the attached 
HydroCad report indicates that the existing facility with proposed parking lot and future expansion will 
sufficiently mitigate both the 2 and 10 year peak storm events.  Results are as follows: 
2 year:  Pre = 45.77 cfs   Post = 38.51 cfs 
10 year: Pre = 82.14 cfs  Post = 81.56 cfs 
Summary 
BUA calculations with removal of existing impervious areas yields a BUA of 4.2% which is considered “Low 
Density” development. Existing flat site conditions have precluded the use of vegetative conveyance from 
original desired outfall location to existing detention facility.  Reverse engineering of existing detention 
facility has verified that existing facility will mitigate both the 2 and 10 year peak storm events without 
additional modifications.  
In addition to the challenges noted above, Geotechnical report developed by Stewart Engineering 
indicates relatively shallow partially weathered rock.  This condition would significantly impact potential 
for basin modification if ultimately deemed necessary.   

Jay D. Banks, PE 
CORNING (CEPI)
BE#1045001
CALCULATIONS FOR:
EXISTING DETENTION CONFIRMATION
DATE:01.08.19
REV:
1919 SOUTH BLVD. CHARLOTTE, NC 28203
704.780.4972
DRAKERD.KISERRD.WHITLEYRD.US-601(NCDOTMAINTAINED-
100'R.O.W.)
WET POND
DRY
DETENTION
FACILITY
DRY
DETENTION
FACILITY
WET POND
C:\Users\Ba\Dropbox(BanksEngineering)\BEPROJECTS\01045WalkerParking\001Corning\Dwg\Z-IMPEXHIBIT-2001.dwgTHIS DOCUMENT, TOGETHER WITH THE CONCEPTS AND DESIGNS PRESENTED HEREIN, AS AN INSTRUMENT OF SERVICE, IS INTENDED ONLY FOR THE SPECIFIC PURPOSE AND CLIENT FOR WHICH IT WAS PREPARED. REUSE OF AND IMPROPER RELIANCE ON THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION AND ADAPTATION BY BANKS ENGINEERING, PLLC. SHALL BE WITHOUT LIABILITY TO BANKS ENGINEERING, PLLC.
IMP
01.04.2019
PROJECT:TITLE:
0
SCALE:
350175
1"= 350'CONCORD EMPLOYEE PARKING IMPROVEMENTS (CEPI)TOTAL POST-PROJECT CAMPUS IMPERVIOUS
WITH 2001 AERIAL IMAGE
N O R T H
ENGINEERING
14.66°75'FRONTSETBACK
1 2
3 4
5
6
7
8
9
10
11
12
13
14
1415161718
19
20
21
22
23
N67°16'50.37"W678.730'S28°24'08.80"W
182.498'
S28°17'03.87"W
839.691'N75°20'18.97"W698.880'S 3 °1 3 '3 6 .0 4 "E455.2 0 8 'S 3 °1 3 '3 2 .0 4 "E606.4 3 5 'N78°08'15.95"W918.365'S 6 °0 8 '0 6.01"W154.6 4 0'S16°20'31.47"W
1167.092'S16°20'31.47"W
1124.905'
S36°35'40.99"W
739.980'S46°01'42.01"E228.880'S52°37'35.01"E1021.940'S72°15'00.01"E154.800'N27°16'05.99"E1134.550'N21° 18' 45.99"E
17.400'S71°54'40.01"E386.920'S71°53'08.01"E386.695'N21°27'57.99"E702.954'N21°42'35.67"E233.294'N21°33'41.49"E369.876'N21°53'53.33"E215.613'
L=560.148,R=3176.645
D=10.1032
N32°53'34.10"E584.966'
N32°19'18.45"E35.840'
N32°54'24.09"E1856.429'N68°03'18.76"W889.215'75'FRONT SETBACK
30'SETBACK3 0 'S E T B A C K
30'SETBACK
30'SETBACK13
CORNING INCORPORATED
BOOK: 2890; PAGE: 0084
PIN14: 55434413150000
ZONED: GI
USE: INDUSTRIAL-FIBER OPTICS
MANUFACTURING
CORNING INCORPORATED
BOOK: 1758; PAGE: 0240
PIN14: 55435780680000
ZONED: GI
USE: INDUSTRIAL-FIBER OPTICS
MANUFACTURING
DRAKERD.KISERRD.WHITLEYRD.FIELDSTONETRCEUS-601(NCDOTMAINTAINED-
100'R.O.W.)
EX. DRY
DETENTION
FACILITY-3
EX. WET POND-1
EX. WET POND-2
EX. DRY
DETENTION
FACILITY-4
C:\Users\Ba\Dropbox(BanksEngineering)\BEPROJECTS\01045WalkerParking\001Corning\Dwg\C8-1IMPERVIOUSINVENTORY.dwgJanuary09,2019-2:09pmBy:BaOWNER:1919 SOUTH BOULEVARD
SUITE 200
CHARLOTTE, NC 28203
T: 704.780.4972
NC License #P-1370
© 2018 ENGINEERINGDESIGNED:
DRAWN:
CHECKED:
PROJECT:
DATE:
JDB
01045001
11.19.18PROJECT:SHEET:A---xx.xx.1912.18.1812.06.1811.19.18Addressreviewcomments1stsubmittaltoNCDOT.2ndsubmittaltoNCDENR1stsubmittaltoNCDENR1stsubmittaltoCabarrusPlanning14556US-601MIDLAND,NC28107CONCORDEMPLOYEESPARKINGIMPROVEMENTS14556US-601MIDLAND,NC28107CLIENT:C8-1IMPERVIOUSINVENTORY0
SCALE:
200100 400
1"= 200'NORTHFLOWE, SAMUEL JUSTIN
BOOK: 5851; PAGE: 0327
PIN14: 55431265000000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
FLOWE, SAMUEL JUSTIN
BOOK: 5851; PAGE: 0304
PIN14: 55431374500000
ZONED: CR
USE: SINGLE FAMILY RURAL
ROBERTS, JAMES B JR REAL ESTATE
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55432415940000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
MILLS, STEPHEN M
BOOK: 3058; PAGE: 0201
PIN14: 55433508890000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
STEPP, DAVID B LF EST
BOOK: 10437; PAGE: 0088
PIN14: 55433622700000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
TROUTMAN, WILLIAM F SR
BOOK: 6923; PAGE: 0281
PIN14: 55433744680000
ZONED: CR
USE: SINGLE FAMILY RURAL
TROUTMAN WILLIAM F SR
BOOK: 6923; PAGE: 0281
PIN14: 55434777470000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
MURPHY, MAC LLC
BOOK: 10821; PAGE: 0105
PIN14: 55435858580000
ZONED: CR
USE: SINGLE FAMILY RURAL
BOC GROUP INC, A DELAWARE CORP
BOOK: 6880; PAGE: 2910
PIN14: 55436804250000
ZONED: GI
USE: OFFICE-INDUSTRIAL PARK
WALLACE, ROBERT L
BOOK: 5061; PAGE: 0009
PIN14: 55436749850000
ZONED: GI
USE: WAREHOUSE-INDUSTRIAL PARK
WALLACE, ROBERT L
BOOK: 5061; PAGE: 0013
PIN14: 55436787760000
ZONED: GI
USE: WAREHOUSE-INDUSTRIAL PARK
BROOKS WILLIAM E SR EST
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55438881450000
ZONED: GI
USE: INDUSTRIAL
LOVE, CLAYTON C JR
BOOK: 9022; PAGE: 0220
PIN14: 55437693370000
ZONED: GI
USE: INDUSTRIAL
DRAKE, JERRY M
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55435452470000
ZONED: CR
USE: SINGLE FAMILY RURAL
BAKER, LARRY N & MELANNIE E
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55435420520000
ZONED: CR
USE: SINGLE FAMILY RURAL
BAKER, LARRY N & MELANNIE E
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55435338030000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
EUDY, LARRY JOE & SHARON A
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55435335960000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
EUDY TRINETTE MARIE REUSCHLEIN
BOOK: 8480; PAGE: 0145
PIN14: 55435332020000
ZONED: CR
USE: SINGLE FAMILY RURAL
HAIGLER, DANNIE H
BOOK: UNKNOWN; PAGE: UNKNOWN
PIN14: 55434355880000
ZONED: CR
USE: SINGLE FAMILY RURAL
HAIGLER, DANNIE H
BOOK: 0582; PAGE: 0563
PIN14: 55434326650000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
GORIS, MARIA
BOOK: 7425; PAGE: 0349
PIN14: 55434311900000
ZONED: CR
USE: SINGLE FAMILY RURAL
SANDERS, GREGORY A
BOOK: 9841; PAGE: 0139
PIN14: 55433265490000
ZONED: CR
USE: SINGLE FAMILY RESIDENTIAL
HOOKS, RANDY C
BOOK: 3784; PAGE: 0142
PIN14: 55432288870000
ZONED: CR
USE: SINGLE FAMILY RURAL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
CORNING TOTAL IMPERVIOUS
234.22
ACRES %OVERALL
STRUCTURE 15.13 6.46%
GRAVEL 26.88 11.47%
ASPHALT 24.86 10.62%
CONCRETE 3.74 1.59%
TOTAL:70.61 30.15%
80.97
153.25
CORNING PROPOSED IMPERVIOUS
234.22
ACRES %OVERALL
STRUCTURE 0 0.00%
GRAVEL 1.48 0.63%
ASPHALT 3.25 1.39%
REV. ASPHALT 1.98 0.84%
CONCRETE 0.52 0.22%
TOTAL:7.23 3.09%
80.97
153.25
CORNING EXISTING IMPERVIOUS (PRIOR 2001)
234.22
ACRES %OVERALL
STRUCTURE 15.13 6.46%
GRAVEL 25.40 10.84%
ASPHALT 19.63 8.38%
CONCRETE 3.21 1.37%
TOTAL:63.37 27.06%
80.97
153.25
STORMWATER PHASE II IMPERVIOUS CALCULATION:
TOTAL CAMPUS AREA:234.22 AC
EXISTING IMPERVIOUS (PRIOR TO 2007): 63.37 AC
PROPOSED IMPERVIOUS: 7.23 AC
BUILT UPON AREA (B.U.A.):
7.23 / (234.22 - 63.37) = 4.2%
CLASSIFICATION (%B.U.A.<24% = LOW DENSITY):LOW DENSITY
DETENTION FACILITY-4
DRAINAGE AREA = 25.66 ACKISERRD.WHITLEYRD.US-601(NCDOTMAINTAINED-
100'R.O.W.)
EX. DRY
DETENTION
FACILITY-3
EX. DRY
DETENTION
FACILITY-4
X
100'SHEET@5.0%1622'CHANNEL185'SHALLOW@5.40%XC:\Users\Ba\Dropbox(BanksEngineering)\BEPROJECTS\01045WalkerParking\001Corning\Dwg\Z-DETBASIN-4DA-TOCEXHIBIT.dwgTHIS DOCUMENT, TOGETHER WITH THE CONCEPTS AND DESIGNS PRESENTED HEREIN, AS AN INSTRUMENT OF SERVICE, IS INTENDED ONLY FOR THE SPECIFIC PURPOSE AND CLIENT FOR WHICH IT WAS PREPARED. REUSE OF AND IMPROPER RELIANCE ON THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION AND ADAPTATION BY BANKS ENGINEERING, PLLC. SHALL BE WITHOUT LIABILITY TO BANKS ENGINEERING, PLLC.
DA
01.08.19
PROJECT:TITLE:
0
SCALE:
15075
1"= 150'CONCORD EMPLOYEE PARKING IMPROVEMENTS (CEPI)EXISTING DETENTION FACILITY-4
DRAINAGE AREA / TIME OF CONCENTRATION
N O R T H
ENGINEERING
C C C C C C C
CCC C C C
CCCCCCC C
CCCC C CCCCC C C C
SF SF SF SF SF SF SF SF SF SF SF
SF SF SF SF SF
CB-66
RIM: 529.30
MOTORCYCLEPARKINGONLY75' FRONT SETBACK75' FRONT SETBACK
15' T HO RO UG HF ARELANDSCAPE YARD
15' T HO RO UG HF ARE
LANDSCAPE YARD15' T HO RO UG HF ARE
LANDSCAPE YARD
US-601
(NCDOT MAINTAINED-100' R.O.W.)US-601
(NCDOT MAINTAINED-100' R.O.W.)KISERRD.WHITLEYRD.US-601
(NCDOT MAINTAINED-
100' R.O.W.)30'SETBACKUEUEUEUEPHASE2-EX.LOTPHASE1-NEWLOT2
:1(MAX.)
STRUCTURAL FILLSTOCKPILE FOR
PHASE 2
SF SF SF SF SF SF SF SFSFSFSFSFSFSFSFSFSFSFS F SFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFS F
SFSFSFS F
S F
SFSFSFSFSFSFS F
SF SF S FSFSFEX. LOT #2
LOT #4
FUTURE
LOT #4523524525526527528529530531
5325335345355365375385365355345315285 2 2
52252752853052953153253453353552653753625.5527527 526 525
52952652753053153253453453334.534.529.553529.55305335325275285345255265295245245245 2 0
52052152252352452552652752852953153253353453653452852752953052429.552952852752552352652453052552952752652853253152524.524.552552454053552752753221.5
53052552321.5 21.522.2521.2552222.552323.552452552322.552252423.552221.522.522.55295245385395405415 4 1539
542531530532533534535536537538539540542543544546546545543544541545CB-63
RIM: 522.65
CB-08
RIM: 523.00
DI-67
RIM: 532.00
CB-09
RIM: 524.90
CB-12
RIM: 529.00
DCB-10
RIM: 523.75
CB-11
RIM: 528.80
CB-15
RIM: 526.65
CB-13
RIM: 533.80
CB-14
RIM: 534.00
CB-07
RIM: 523.00
CB-06
RIM: 523.00
CB-19
RIM: 531.20
CB-16
RIM: 527.90
CB-17
RIM: 529.00
CB-18
RIM: 529.95
CB-20
RIM: 532.35
CB-21
RIM: 519.50
EXMH-50
RIM: 521.40
INV: 514.76
CB-51
RIM: 521.00
STMH-52
RIM: 523.40
INV: 519.90
CDI-53
RIM: 521.00
INV: 515.07
CDI-54
RIM: 521.00
INV: 515.29
CDI-55
RIM: 521.00
INV: 515.44
CDI-56
RIM: 521.00
INV: 515.72
CDI-57
RIM: 521.00
INV: 516.53
CB-58
RIM: 521.20
CB-59
RIM: 522.65
CB-61
RIM: 522.65
CB-60
RIM: 521.30CB-62
RIM: 521.30
EXDI-64
RIM: 522.44
INV: 517.80
CB-65
RIM: 526.65
CB-05
RIM: 521.50
FES-01
INV: 515.00
STMH-04
RIM: 523.00
STMH-03
RIM: 523.00 STMH-02
RIM: 520.75
FES-22
INV: 517.10
DRY DETENTION
FACILITY
15" RCP
CULVERT
SEE ROADWAY
SHEETS RD2-X FOR
GRADING DETAILS
15+850+00 1+00 2+00 3+00 4+00 5+00 6 +00 7+00 8 +00 9+00 10+00 11+00 12+00 13+00 1 4+00 15+00
Know what's
R
C:\Users\Ba\Dropbox(BanksEngineering)\BEPROJECTS\01045WalkerParking\001Corning\Dwg\C4-0TOC4-3GRADING.dwgTHIS DOCUMENT, TOGETHER WITH THE CONCEPTS AND DESIGNS PRESENTED HEREIN, AS AN INSTRUMENT OF SERVICE, IS INTENDED ONLY FOR THE SPECIFIC PURPOSE AND CLIENT FOR WHICH IT WAS PREPARED. REUSE OF AND IMPROPER RELIANCE ON THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION AND ADAPTATION BY BANKS ENGINEERING, PLLC. SHALL BE WITHOUT LIABILITY TO BANKS ENGINEERING, PLLC.December17,2018-2:37amBy:BaOWNER:1919 SOUTH BOULEVARD
SUITE 200
CHARLOTTE, NC 28203
T: 704.780.4972
NC License #P-1370
© 2018 ENGINEERINGDESIGNED:
DRAWN:
CHECKED:
PROJECT:
DATE:
JDB
01045001
11.19.18PROJECT:SHEET:---REV.12.18.1812.06.1811.19.18DATE1stsubmittaltoNCDOT.2ndsubmittaltoNCDENR1stsubmittaltoNCDENR1stsubmittaltoCabarrusPlanningDESCRIPTIONNORT
H14556US-601MIDLAND,NC28107CONCORDEMPLOYEESPARKINGIMPROVEMENTS14556US-601MIDLAND,NC28107CLIENT:0
SCALE:
8040 160
1"= 80'C4-0GRADINGOVERALLPROPOSED CONSTRUCTION LIMITS
PROPOSED MAJOR CONTOUR
PROPOSED MINOR CONTOUR
PROPOSED SPOT
PROPOSED GRADING ARROW
GRADING LEGEND
PROPOSED WALL SPOTS
PROPOSED INTER. CONTOUR
799
TC: 100.00BC: 100.00597.00
TW: 100.00BW: 100.00
25.5
PROPOSED IRRIGATION SLEEVE
PROPOSED STORMSTMH-1
STUB
TC: 100.00BC: 100.00597.00
TW: 100.00BW: 100.00
TC: 100.00BC: 100.00597.00
TW: 100.00BW: 100.00
2 - 2" PVCGRADING NOTES
1. SEE GENERAL NOTES SHEET C0-2 FOR GRADING NOTES.
2. CONTRACTOR SHALL REVIEW, UNDERSTAND AND IMPLEMENT ALL REQUIRED
EROSION AND SEDIMENTATION CONTROL MEASURES PRIOR TO ANY DISTURBANCE.
3. SEE THE EROSION CONTROL PLANS AND DETAILS FOR THE LOCATION AND SIZING OF
ALL RIP-RAP APRONS AND SLOPE AND CHANNEL LININGS.
4. ON ALL SLOPES STEEPER THAN 3:1, CONTRACTOR SHALL INSTALL NORTH AMERICAN
GREEN PRODUCT SC150 EROSION CONTROL MATTING. REFER TO NAG FOR
INSTALLATION GUILDELINES.
5. ALL SPOT ELEVATIONS ALONG CURB AND GUTTER LINE REPRESENT FLOW LINE
ELEVATIONS UNLESS OTHERWISE NOTED.
6. CONTRACTOR AND/OR CONSTRUCTION SURVEYOR TO VERIFY THAT CONSTRUCTION
STAKING BASED ON CONTOURS AND SPOT ELEVATIONS DOES NOT CONFLICT WITH
SLOPE CALL-OUTS OR ADA REQUIREMENTS. NOTIFY SITE ENGINEER OF ANY
DISCREPANCIES AND AWAIT FURTHER INSTRUCTION.
7. PRIOR TO CONSTRUCTION, CONTRACTOR SHALL VERIFY THE ACCURACY OF ALL
STORM/UTILITY TIE-IN INVERTS SHOWN AND NOTIFY THE SITE ENGINEER
IMMEDIATELY IF THERE IS A DISCREPANCY
8. AFTER VERIFICATION, ALL GRAVITY PIPE INSTALLATION(S) SHALL BEGIN AT THE
LOWEST ELEVATION OUTFALL AND/OR TIE-IN POINT(S) INDICATED AND PROCEED
UPSTREAM UNLESS OTHERWISE INDICATED ON THE PLANS. INSTALLATION(S) NOT
FOLLOWING THIS SEQUENCE WILL BE CONSIDERED A CONTRACTOR "MEANS AND
METHODS" AND WILL SUBSEQUENTLY ASSUME ALL RISKS ASSOCIATED WITH
MEETING INDICATED TIE-OUT ELEVATION, NECESSARY PIPE ADJUSTMENTS DUE TO
CONFLICTS AND PIPE SLOPES AS INDICATED. ALL ADDITIONAL COSTS (INCLUDING
ENGINEERING) ASSOCIATED WITH RE-WORKING PIPE SYSTEM TO FUNCTION
PROPERLY WILL BE AT THE CONTRACTORS EXPENSE.
NOTE TO CONTRACTOR - AS-BUILT FOR DETENTION
SYSTEM:
CONTRACTOR SHALL ENGAGE NC LICENSED SURVEYOR TO PROVIDE
AS-BUILT SURVEY OF STORM COLLECTION SYSTEM AS WELL AS
UNDERGROUND UTILITIES. SURVEY SHALL BE IN NC STATE PLANE
COORDINATE SYSTEM USING SAME SURVEY CONTROL AS ORIGINAL
DESIGN SURVEY. UTILITY SERVICES (I.E. POWER, GAS, WATER, FOC,
ETC. TO INCLUDE LINES SIZES AND DEPTH INFORMATION.
AS-BUILT SURVEY INFORMATION WILL BE COMPARED WITH DESIGN
DRAWINGS FOR VERIFICATION THAT PIPE INVERTS, PIPE LENGTHS
AND OTHER SYSTEM PARAMETERS MATCH THE DESIGN DRAWINGS.
VARIATIONS FROM THE DESIGN DRAWINGS MAY REQUIRE
REMOVAL/REPLACEMENT AT THE CONTRACTORS EXPENSE.
DIP = DUCTILE IRON PIPE - PC 350 W/ TYPE 5 BEDDING. USE 16" DIA. PIPE IF TABLE ABOVE INDICATES 15"
**ALL PIPE MATERIALS AND STRUCTURES TO BE INSTALLED PER MANUFACTURES SPECIFICATIONS, GEOTECHNICAL ENGINEER AND/OR
LOCAL REGULATIONS, WHICHEVER IS MORE STRINGENT.
*** PERIMETER PIPING AROUND BUILDING TO PICK UP ROOF LEADERS OR SMALL AREA DRAINS SHALL NOT COMMENCE UNTIL AFTER
BUILDING FOOTINGS HAVE BEEN INSTALLED. ADJUSTMENT TO THESE LINES MAY BE NECESSARY DUE TO FOOTINGS.
RCP = REINFORCED CONCRETE PIPE-CLASS III IF NOT SPECIFIED. JOINT TO CONFORM WITH AASHTO M198
PVC = POLYVINYL CHLORIDE PIPE - SCHEDULE 40
DI = DROP INLET (WITH FRAME AND GRATE) PER NCDOT STD 840.15/16
SDMH = MANHOLE JUNCTION (WITH SOLID LID) PER NCDOT STD 840.31/54
JB = ROOF LEADER/SMALL DIA. DRAIN STRUCTURE - SEE NYOPLAST 15" CAST IRON H-20 GRATE AND DRAIN BASIN DETAILS
YI = YARD INLET - SEE NYOPLAST 15" CAST IRON H-20 GRATE AND DRAIN BASIN DETAILS
AD = AREA DRAIN - SEE NYOPLAST 15" CAST IRON H-20 GRATE AND DRAIN BASIN DETAILS
O-RING - WATER TIGHT GASKETED RCP/HDPE
RL = ROOF LEADER COLLECTION MANIFOLD - HDPE SMOOTH WALL (TYPE S)
HDPE = HIGH DENSITY POLYETYLENE - CORRUGATED EXTERIOR/SMOOTH INTERIOR (TYPE S). AASHTO M294
CMP = CORRUGATED METAL PIPE - ALUMINIZED TYPE II, 14 GAUGE, HEL-COR W/ HUGGER JOINTS OR EQUAL.
DCB = DOUBLE CATCH BASIN (WITH FRAME, GRATE, AND HOOD) PER NCDOT STD 840.01/02
CDI & CCB = CONVERT EX STRUCTURE TO DROP INLET OR CATCH BASIS. SEE CB & DI FOR STANDARDS
STCB = SLAB TOP CATCH BASIN PER NCDOT 840.04
EW = PRECAST CONCRETE ENDWALL PER NCDOT STD 838.80
FES = FLARED END SECTION - CONCRETE WITH ADAPTER IF NECESSARY FOR CONNECTION TO HDPE STORM PIPE-NO HDPE OR CMP.
CO - PVC CLEAN-OUT WITH TRAFFIC RATED BRASS CAP
JCT - PRECAST CONCRETE JUNCTION BOX - NO "KNOCK-OUT" TYPE BOXES ARE PERMITTED
CB = CATCH BASIN (WITH FRAME, GRATE, AND HOOD) PER NCDOT STD 840.01/02
NOTE TO CONTRACTOR:
GEOTECHNICAL REPORT INDICATES SHALLOW WEATHERED ROCK WITH BPF > 50. OVERALL MASS GRADING DOES NOT
APPEAR TO ENCROACH UPON THESE REGIONS BUT IT MAY BE ENCOUNTERED DURING STORM DRAINAGE INSTALLATION. AN
ALLOWANCE SHALL BE INCLUDED WITH BASE BID TO ACCOUNT FOR THIS CONDITION. SEE GEOTECHNICAL ENGINEERING
REPORT DATED 11.06.18 DEVELOPED BY STEWART ENGINEERING PRIOR TO BIDDDING.
STRUCTURE RIM ELEV (ft) INVERT IN (1) (ft) INVERT IN (2) (ft) INVERT IN (3) (ft) INVERT OUT (ft)
STMH-52 523.40 (N/A)(N/A)(N/A)519.90
STMH-04 523.00 516.32 (N/A)(N/A)516.32
STMH-03 523.00 515.64 (N/A)(N/A)515.64
STMH-02 520.75 515.12 (N/A)(N/A)515.12
FES-22 519.75 (N/A)(N/A)(N/A)517.10
DI-67 532.00 (N/A)(N/A)(N/A)528.16
DCB-10 523.75 (N/A)(N/A)(N/A)520.50
CB-66 529.30 526.05 (N/A)(N/A)526.05
CB-65 526.65 523.40 (N/A)(N/A)520.73
CB-63 522.65 (N/A)(N/A)(N/A)519.40
CB-62 521.30 518.05 (N/A)(N/A)518.05
CB-61 522.65 (N/A)(N/A)(N/A)519.40
CB-60 521.30 518.05 (N/A)(N/A)518.05
CB-59 522.65 (N/A)(N/A)(N/A)519.40
CB-58 521.20 517.95 (N/A)(N/A)517.95
CB-51 521.00 516.75 (N/A)(N/A)516.50
CB-21 519.50 516.85 (N/A)(N/A)516.85
CB-20 532.35 (N/A)(N/A)(N/A)529.10
CB-19 531.20 527.95 (N/A)(N/A)527.95
CB-18 529.95 526.70 (N/A)(N/A)525.27
CB-17 529.00 (N/A)(N/A)(N/A)525.75
CB-16 527.90 524.65 (N/A)(N/A)524.65
CB-15 526.65 523.40 522.40 (N/A)522.40
CB-14 534.00 (N/A)(N/A)(N/A)530.75
CB-13 533.80 530.18 (N/A)(N/A)527.83
CB-12 529.00 (N/A)(N/A)(N/A)525.75
CB-11 528.80 524.55 525.18 (N/A)522.39
CB-09 524.90 520.65 520.06 (N/A)520.06
CB-08 523.00 519.00 (N/A)(N/A)519.00
CB-07 523.00 518.52 (N/A)(N/A)518.52
CB-06 523.00 517.91 (N/A)(N/A)517.91
CB-05 521.50 517.42 518.25 516.66 516.66
FES-01 520.00 515.05 (N/A)(N/A)515.00
EXMH-50 521.40 516.34 (N/A)(N/A)514.76
EXDI-64 522.44 518.19 (N/A)(N/A)517.80
CDI-56 521.00 517.67 (N/A)(N/A)515.72
CDI-55 521.00 517.75 (N/A)(N/A)515.44
CDI-53 521.00 517.75 (N/A)(N/A)515.29
STORM STRUCTURE TABLE
START NODE STOP NODE US INVERT (ft) DS INVERT (ft) DIAMETER (in) MATERIAL LENGTH (ft) SLOPE (ft/ft)
CB-14 CB-13 530.75 530.18 15 HDPE O-RING 113.4 0.005
CB-13 CB-11 527.83 524.55 15 HDPE O-RING 82 0.040
CB-11 CB-09 522.39 520.65 15 HDPE O-RING 86.9 0.020
CB-09 CB-08 520.06 519.00 24 HDPE O-RING 154.2 0.007
CB-08 CB-07 519.00 518.52 24 HDPE O-RING 95.2 0.005
CB-07 CB-06 518.52 517.91 24 HDPE O-RING 122.3 0.005
CB-06 CB-05 517.91 517.42 24 HDPE O-RING 99.2 0.005
CB-05 STMH-04 516.66 516.32 30 HDPE O-RING 67.9 0.005
STMH-04 STMH-03 516.32 515.64 30 HDPE O-RING 136.1 0.005
STMH-03 STMH-02 515.64 515.12 30 HDPE O-RING 104.7 0.005
STMH-02 FES-01 515.12 515.05 30 HDPE O-RING 14.1 0.005
CB-12 CB-11 525.75 525.18 15 HDPE O-RING 113.4 0.005
DCB-10 CB-09 520.50 520.06 15 HDPE O-RING 88.8 0.005
CB-17 CB-16 525.75 524.65 15 HDPE O-RING 170 0.006
CB-16 CB-15 524.65 523.40 15 HDPE O-RING 127.1 0.010
CB-15 CB-05 522.40 518.25 15 HDPE O-RING 98.4 0.042
CB-20 CB-19 529.10 527.95 15 HDPE O-RING 117.9 0.010
CB-19 CB-18 527.95 526.70 15 HDPE O-RING 127 0.010
CB-18 CB-15 525.27 522.40 15 HDPE O-RING 82 0.035
DI-67 CB-66 528.16 526.05 15 HDPE O-RING 21.1 0.100
CB-66 CB-65 526.05 523.40 15 HDPE O-RING 77.9 0.034
CB-65 EXDI-64 520.73 518.19 15 HDPE O-RING 50.9 0.050
CB-59 CB-58 519.40 517.95 15 HDPE O-RING 93.2 0.016
CB-58 CDI-56 517.95 517.67 15 HDPE O-RING 56.3 0.005
CB-61 CB-60 519.40 518.05 15 HDPE O-RING 90.3 0.015
CB-60 CDI-55 518.05 517.75 15 HDPE O-RING 33.6 0.009
CB-63 CB-62 519.40 518.05 15 HDPE O-RING 58.5 0.023
CB-62 CDI-53 518.05 517.75 15 HDPE O-RING 42.8 0.007
STMH-52 CB-51 519.90 516.75 18 HDPE O-RING 42.1 0.075
CB-51 EXMH-50 516.50 516.34 18 HDPE O-RING 15.9 0.010
FES-22 CB-21 517.10 516.85 15 DIP 47.5 0.005
CB-21 CB-05 516.85 516.66 15 HDPE O-RING 37.3 0.005
STORM PIPE TABLE
CORNING (CEPI)
PROJECT NO.:1045001 BY:jdb
DATE:01.08.19 T.M.:
REVISED: P.M.:
INTRODUCTION:
SUMMARY
DRAINAGE AREAS:
(see attached drainage area map)
Pond A Predeveloped Drainage Area =1,117,764 sqft 25.7 ac
Postdeveloped Drainage Area=1,117,764 sqft 25.7 ac
SOIL TYPES:(see attached soils map)
Basin A Area (%) Soil Type Area (sf)
Hydrologic
Soil Group
52.3% Badin 584,591 C
47.7% Kirksey 533,173 C
Total 100%1,117,764 sf
CURVE NUMBER:

Predeveloped CN - Basin-4
Cover Type Area (SF) % CN Wtd. CN
Woods-Good cond. 261,316 0.23 70 16.36
Row crops-Good cond. 808,808 0.72 85 61.51
Impervious 47,640 0.04 98 4.18
Total 1,117,764 82.05
Composite CN 82.05 Use CN =82
Postdeveloped CN - Pond A
Cover Type Area (SF) % CN Wtd. CN
Wood-Good cond. 261,316 0.23 70 16.36
Grass-Good cond. 384,941 0.34 74 25.48
Impervious 471,507 0.42 98 41.34
Total 1,117,764 83.19
Composite CN 83.19 Use CN =83
PROJECT DESCRIPTION & SOILS (BASIN-4)

The Corning facility in Midland, NC is planning to construct a 400-600 space surface parking facility that was a component of the original
site design plans when the plant was first constructed in the late 1990's. Four (4) stormwater facilities (two wet ponds and two dry
detention) were installed during initial plant construction. Unfortunately, per Corning research, it appears as though the original design
calculations for these facilites have been lost over the last two decades. As a result, the following calculations are an attempt to re-
create design calculations for the basin (a.k.a Basin-4 or Northeast Detention Basin) that serves proposed parking area. Historical
imagery and 2001 SWPPP have been utilized to assist with re-creating design calculations.
Page 1 of 1
Hydrologic Soil Group—Cabarrus County, North Carolina
(CORNING DETENTION FACILITY-4)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
1/7/2019
Page 1 of 4389680038968703896940389701038970803897150389722038972903897360389680038968703896940389701038970803897150389722038972903897360543590543660543730543800543870543940544010
543590 543660 543730 543800 543870 543940 544010
35° 13' 6'' N 80° 31' 15'' W35° 13' 6'' N80° 30' 58'' W35° 12' 47'' N
80° 31' 15'' W35° 12' 47'' N
80° 30' 58'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 100 200 400 600
Feet
0 40 80 160 240
Meters
Map Scale: 1:2,810 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
BaB Badin channery silt
loam, 2 to 8 percent
slopes
C 13.4 52.3%
KkB Kirksey silt loam, 1 to 6
percent slopes
C 12.2 47.7%
Totals for Area of Interest 25.7 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Cabarrus County, North Carolina CORNING DETENTION FACILITY-4
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
1/7/2019
Page 3 of 4
CORNING (CEPI)
PROJECT NO.145001 BY:jdb
DATE:01.08.19 T.M:
REVISED: P.M.:
BASIN-4 TIME OF CONCENTRATION
PRE-DEVELOPMENT
Pre-development Type: Sheet Flow
Flow Phase One Length:100 ft
"N" Value:0.4 from tables
Slope:0.05 ft/ft
Computed 'T' 15.1 Minutes
Pre-development Type: Shallow Concentrated Flow
Flow Phase Two Surface:u
Length:185 ft
u=unpaved Slope:0.054 ft/ft
p=paved Velocity:3.75 ft/sec
Computed 'T': 0.014 hr, or 0.84 Minutes
Pre-development Type: Open Channel Flow
Flow Phase Three Length:1622 ft
Velocity:5 ft/sec (assumed)
Computed 'T': 0.09 hr, or 5.4 Minutes
Pre-development Time of Concentration
Total Flow Total T c =21.3 Minutes
Summary Lag Time
T LAG =12.8 Minutes
T LAG =0.6 x T c T LAG =0.21 Hours

BASIN-4 TIME OF CONCENTRATION
POST-DEVELOPMENT
Post-development Time of Concentration
Total Flow Total T c =10.0 Minutes
Summary Lag Time
T LAG =3.0 Minutes
T LAG =0.6 x T c T LAG =0.05 Hours
TIME OF CONCENTRATION
Page 1 of 1
1S
Pre-dev Det-4
2S
Post-Dev Det-4
3P
Detention Basin-4
Routing Diagram for 190109 Corning CEPI - Det-4
Prepared by Banks Engineering, Printed 1/9/2019
HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 2HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Summary for Subcatchment 1S: Pre-dev Det-4
Runoff = 45.77 cfs @ 12.15 hrs, Volume= 3.601 af, Depth= 1.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"
Area (ac) CN Description
* 25.660 82
25.660 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
21.6 Direct Entry, From spreadsheet
Subcatchment 1S: Pre-dev Det-4
Runoff
Hydrograph
Time (hours)
12011511010510095908580757065605550454035302520151050Flow (cfs)50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
2 yr 24hr Storm Rainfall=3.38"
Runoff Area=25.660 ac
Runoff Volume=3.601 af
Runoff Depth=1.68"
Tc=21.6 min
CN=82
45.77 cfs
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 3HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 1S: Pre-dev Det-4
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.50 0.05 0.00 0.00
3.00 0.12 0.00 0.00
4.50 0.19 0.00 0.00
6.00 0.27 0.00 0.00
7.50 0.37 0.00 0.00
9.00 0.50 0.00 0.06
10.50 0.69 0.03 0.61
12.00 2.24 0.81 28.16
13.50 2.70 1.15 3.73
15.00 2.88 1.29 2.19
16.50 3.01 1.39 1.56
18.00 3.11 1.47 1.31
19.50 3.19 1.53 1.06
21.00 3.26 1.59 0.89
22.50 3.32 1.64 0.85
24.00 3.38 1.68 0.80
25.50 3.38 1.68 0.00
27.00 3.38 1.68 0.00
28.50 3.38 1.68 0.00
30.00 3.38 1.68 0.00
31.50 3.38 1.68 0.00
33.00 3.38 1.68 0.00
34.50 3.38 1.68 0.00
36.00 3.38 1.68 0.00
37.50 3.38 1.68 0.00
39.00 3.38 1.68 0.00
40.50 3.38 1.68 0.00
42.00 3.38 1.68 0.00
43.50 3.38 1.68 0.00
45.00 3.38 1.68 0.00
46.50 3.38 1.68 0.00
48.00 3.38 1.68 0.00
49.50 3.38 1.68 0.00
51.00 3.38 1.68 0.00
52.50 3.38 1.68 0.00
54.00 3.38 1.68 0.00
55.50 3.38 1.68 0.00
57.00 3.38 1.68 0.00
58.50 3.38 1.68 0.00
60.00 3.38 1.68 0.00
61.50 3.38 1.68 0.00
63.00 3.38 1.68 0.00
64.50 3.38 1.68 0.00
66.00 3.38 1.68 0.00
67.50 3.38 1.68 0.00
69.00 3.38 1.68 0.00
70.50 3.38 1.68 0.00
72.00 3.38 1.68 0.00
73.50 3.38 1.68 0.00
75.00 3.38 1.68 0.00
76.50 3.38 1.68 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
78.00 3.38 1.68 0.00
79.50 3.38 1.68 0.00
81.00 3.38 1.68 0.00
82.50 3.38 1.68 0.00
84.00 3.38 1.68 0.00
85.50 3.38 1.68 0.00
87.00 3.38 1.68 0.00
88.50 3.38 1.68 0.00
90.00 3.38 1.68 0.00
91.50 3.38 1.68 0.00
93.00 3.38 1.68 0.00
94.50 3.38 1.68 0.00
96.00 3.38 1.68 0.00
97.50 3.38 1.68 0.00
99.00 3.38 1.68 0.00
100.50 3.38 1.68 0.00
102.00 3.38 1.68 0.00
103.50 3.38 1.68 0.00
105.00 3.38 1.68 0.00
106.50 3.38 1.68 0.00
108.00 3.38 1.68 0.00
109.50 3.38 1.68 0.00
111.00 3.38 1.68 0.00
112.50 3.38 1.68 0.00
114.00 3.38 1.68 0.00
115.50 3.38 1.68 0.00
117.00 3.38 1.68 0.00
118.50 3.38 1.68 0.00
120.00 3.38 1.68 0.00
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 4HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Summary for Subcatchment 2S: Post-Dev Det-4
Runoff = 69.21 cfs @ 12.02 hrs, Volume= 3.759 af, Depth= 1.76"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"
Area (ac) CN Description
* 25.660 83
25.660 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, From spreadsheet
Subcatchment 2S: Post-Dev Det-4
Runoff
Hydrograph
Time (hours)
12011511010510095908580757065605550454035302520151050Flow (cfs)75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
2 yr 24hr Storm Rainfall=3.38"
Runoff Area=25.660 ac
Runoff Volume=3.759 af
Runoff Depth=1.76"
Tc=10.0 min
CN=83
69.21 cfs
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 5HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 2S: Post-Dev Det-4
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.50 0.05 0.00 0.00
3.00 0.12 0.00 0.00
4.50 0.19 0.00 0.00
6.00 0.27 0.00 0.00
7.50 0.37 0.00 0.00
9.00 0.50 0.00 0.18
10.50 0.69 0.03 0.88
12.00 2.24 0.86 67.98
13.50 2.70 1.21 3.48
15.00 2.88 1.35 2.16
16.50 3.01 1.46 1.56
18.00 3.11 1.54 1.31
19.50 3.19 1.60 1.05
21.00 3.26 1.66 0.91
22.50 3.32 1.71 0.86
24.00 3.38 1.76 0.81
25.50 3.38 1.76 0.00
27.00 3.38 1.76 0.00
28.50 3.38 1.76 0.00
30.00 3.38 1.76 0.00
31.50 3.38 1.76 0.00
33.00 3.38 1.76 0.00
34.50 3.38 1.76 0.00
36.00 3.38 1.76 0.00
37.50 3.38 1.76 0.00
39.00 3.38 1.76 0.00
40.50 3.38 1.76 0.00
42.00 3.38 1.76 0.00
43.50 3.38 1.76 0.00
45.00 3.38 1.76 0.00
46.50 3.38 1.76 0.00
48.00 3.38 1.76 0.00
49.50 3.38 1.76 0.00
51.00 3.38 1.76 0.00
52.50 3.38 1.76 0.00
54.00 3.38 1.76 0.00
55.50 3.38 1.76 0.00
57.00 3.38 1.76 0.00
58.50 3.38 1.76 0.00
60.00 3.38 1.76 0.00
61.50 3.38 1.76 0.00
63.00 3.38 1.76 0.00
64.50 3.38 1.76 0.00
66.00 3.38 1.76 0.00
67.50 3.38 1.76 0.00
69.00 3.38 1.76 0.00
70.50 3.38 1.76 0.00
72.00 3.38 1.76 0.00
73.50 3.38 1.76 0.00
75.00 3.38 1.76 0.00
76.50 3.38 1.76 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
78.00 3.38 1.76 0.00
79.50 3.38 1.76 0.00
81.00 3.38 1.76 0.00
82.50 3.38 1.76 0.00
84.00 3.38 1.76 0.00
85.50 3.38 1.76 0.00
87.00 3.38 1.76 0.00
88.50 3.38 1.76 0.00
90.00 3.38 1.76 0.00
91.50 3.38 1.76 0.00
93.00 3.38 1.76 0.00
94.50 3.38 1.76 0.00
96.00 3.38 1.76 0.00
97.50 3.38 1.76 0.00
99.00 3.38 1.76 0.00
100.50 3.38 1.76 0.00
102.00 3.38 1.76 0.00
103.50 3.38 1.76 0.00
105.00 3.38 1.76 0.00
106.50 3.38 1.76 0.00
108.00 3.38 1.76 0.00
109.50 3.38 1.76 0.00
111.00 3.38 1.76 0.00
112.50 3.38 1.76 0.00
114.00 3.38 1.76 0.00
115.50 3.38 1.76 0.00
117.00 3.38 1.76 0.00
118.50 3.38 1.76 0.00
120.00 3.38 1.76 0.00
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 6HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Summary for Pond 3P: Detention Basin-4
Inflow Area = 25.660 ac, 0.00% Impervious, Inflow Depth = 1.76" for 2 yr 24hr Storm event
Inflow = 69.21 cfs @ 12.02 hrs, Volume= 3.759 af
Outflow = 38.51 cfs @ 12.13 hrs, Volume= 3.759 af, Atten= 44%, Lag= 6.5 min
Primary = 12.73 cfs @ 12.13 hrs, Volume= 3.021 af
Secondary = 25.79 cfs @ 12.13 hrs, Volume= 0.738 af
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Peak Elev= 513.99' @ 12.13 hrs Surf.Area= 24,842 sf Storage= 41,475 cf
Plug-Flow detention time= 20.0 min calculated for 3.758 af (100% of inflow)
Center-of-Mass det. time= 20.0 min ( 850.9 - 830.9 )
Volume Invert Avail.Storage Storage Description
#1 511.00' 75,871 cf Custom Stage Data (Irregular) Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft)
511.00 5 16.0 0 0 5
512.00 11,321 454.0 3,855 3,855 16,389
513.00 20,086 578.0 15,496 19,350 26,585
514.00 24,909 992.0 22,454 41,804 78,315
515.00 28,490 1,006.0 26,679 68,484 80,754
515.25 30,616 1,030.0 7,387 75,871 84,651
Device Routing Invert Outlet Devices
#1 Primary 511.00'18.0" Round Culvert
L= 41.0' RCP, end-section conforming to fill, Ke= 0.500
Inlet / Outlet Invert= 511.00' / 510.71' S= 0.0071 '/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 1.77 sf
#2 Secondary 513.00'10.0' long x 20.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=12.71 cfs @ 12.13 hrs HW=513.98' (Free Discharge)
1=Culvert (Inlet Controls 12.71 cfs @ 7.19 fps)
Secondary OutFlow Max=25.63 cfs @ 12.13 hrs HW=513.98' (Free Discharge)
2=Broad-Crested Rectangular Weir (Weir Controls 25.63 cfs @ 2.61 fps)
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 7HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Pond 3P: Detention Basin-4
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
12011511010510095908580757065605550454035302520151050Flow (cfs)75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=25.660 ac
Peak Elev=513.99'
Storage=41,475 cf
69.21 cfs
38.51 cfs
12.73 cfs
25.79 cfs
Pond 3P: Detention Basin-4
Total
Primary
Secondary
Stage-Discharge
Discharge (cfs)
1009080706050403020100Elevation (feet)515
514
513
512
511
Culvert
Broad-Crested Rectangular Weir
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 8HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Pond 3P: Detention Basin-4
Surface
Storage
Stage-Area-Storage
Storage (cubic-feet)
70,00060,00050,00040,00030,00020,00010,0000
Surface/Horizontal/Wetted Area (sq-ft)
30,00028,00026,00024,00022,00020,00018,00016,00014,00012,00010,0008,0006,0004,0002,0000
Elevation (feet)515
514
513
512
511
Custom Stage Data
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 9HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Hydrograph for Pond 3P: Detention Basin-4
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 511.00 0.00 0.00 0.00
3.00 0.00 0 511.00 0.00 0.00 0.00
6.00 0.00 0 511.00 0.00 0.00 0.00
9.00 0.18 32 511.18 0.15 0.15 0.00
12.00 67.98 29,640 513.49 20.08 10.95 9.13
15.00 2.16 2,267 511.83 2.63 2.63 0.00
18.00 1.31 748 511.57 1.35 1.35 0.00
21.00 0.91 403 511.46 0.91 0.91 0.00
24.00 0.81 337 511.43 0.81 0.81 0.00
27.00 0.00 0 511.00 0.00 0.00 0.00
30.00 0.00 0 511.00 0.00 0.00 0.00
33.00 0.00 0 511.00 0.00 0.00 0.00
36.00 0.00 0 511.00 0.00 0.00 0.00
39.00 0.00 0 511.00 0.00 0.00 0.00
42.00 0.00 0 511.00 0.00 0.00 0.00
45.00 0.00 0 511.00 0.00 0.00 0.00
48.00 0.00 0 511.00 0.00 0.00 0.00
51.00 0.00 0 511.00 0.00 0.00 0.00
54.00 0.00 0 511.00 0.00 0.00 0.00
57.00 0.00 0 511.00 0.00 0.00 0.00
60.00 0.00 0 511.00 0.00 0.00 0.00
63.00 0.00 0 511.00 0.00 0.00 0.00
66.00 0.00 0 511.00 0.00 0.00 0.00
69.00 0.00 0 511.00 0.00 0.00 0.00
72.00 0.00 0 511.00 0.00 0.00 0.00
75.00 0.00 0 511.00 0.00 0.00 0.00
78.00 0.00 0 511.00 0.00 0.00 0.00
81.00 0.00 0 511.00 0.00 0.00 0.00
84.00 0.00 0 511.00 0.00 0.00 0.00
87.00 0.00 0 511.00 0.00 0.00 0.00
90.00 0.00 0 511.00 0.00 0.00 0.00
93.00 0.00 0 511.00 0.00 0.00 0.00
96.00 0.00 0 511.00 0.00 0.00 0.00
99.00 0.00 0 511.00 0.00 0.00 0.00
102.00 0.00 0 511.00 0.00 0.00 0.00
105.00 0.00 0 511.00 0.00 0.00 0.00
108.00 0.00 0 511.00 0.00 0.00 0.00
111.00 0.00 0 511.00 0.00 0.00 0.00
114.00 0.00 0 511.00 0.00 0.00 0.00
117.00 0.00 0 511.00 0.00 0.00 0.00
120.00 0.00 0 511.00 0.00 0.00 0.00
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 10HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Stage-Discharge for Pond 3P: Detention Basin-4
Elevation
(feet)
Discharge
(cfs)
Primary
(cfs)
Secondary
(cfs)
511.00 0.00 0.00 0.00
511.05 0.01 0.01 0.00
511.10 0.04 0.04 0.00
511.15 0.10 0.10 0.00
511.20 0.18 0.18 0.00
511.25 0.29 0.29 0.00
511.30 0.41 0.41 0.00
511.35 0.55 0.55 0.00
511.40 0.71 0.71 0.00
511.45 0.88 0.88 0.00
511.50 1.07 1.07 0.00
511.55 1.27 1.27 0.00
511.60 1.48 1.48 0.00
511.65 1.71 1.71 0.00
511.70 1.95 1.95 0.00
511.75 2.20 2.20 0.00
511.80 2.45 2.45 0.00
511.85 2.72 2.72 0.00
511.90 2.99 2.99 0.00
511.95 3.28 3.28 0.00
512.00 3.56 3.56 0.00
512.05 3.86 3.86 0.00
512.10 4.15 4.15 0.00
512.15 4.46 4.46 0.00
512.20 4.76 4.76 0.00
512.25 5.07 5.07 0.00
512.30 5.37 5.37 0.00
512.35 5.68 5.68 0.00
512.40 5.98 5.98 0.00
512.45 6.29 6.29 0.00
512.50 6.58 6.58 0.00
512.55 6.87 6.87 0.00
512.60 7.16 7.16 0.00
512.65 7.43 7.43 0.00
512.70 7.69 7.69 0.00
512.75 7.94 7.94 0.00
512.80 8.17 8.17 0.00
512.85 8.37 8.37 0.00
512.90 8.54 8.54 0.00
512.95 8.66 8.66 0.00
513.00 8.62 8.62 0.00
513.05 9.19 8.89 0.30
513.10 10.00 9.15 0.85
513.15 10.96 9.40 1.56
513.20 12.05 9.65 2.40
513.25 13.24 9.89 3.36
513.30 14.54 10.12 4.42
513.35 15.93 10.35 5.58
513.40 17.41 10.58 6.83
513.45 18.95 10.80 8.15
513.50 20.56 11.01 9.55
513.55 22.24 11.22 11.01
Elevation
(feet)
Discharge
(cfs)
Primary
(cfs)
Secondary
(cfs)
513.60 23.98 11.43 12.55
513.65 25.71 11.64 14.07
513.70 27.47 11.84 15.64
513.75 29.28 12.03 17.24
513.80 31.07 12.18 18.89
513.85 33.00 12.33 20.67
513.90 34.97 12.48 22.50
513.95 37.00 12.62 24.38
514.00 39.06 12.76 26.30
514.05 41.23 12.90 28.32
514.10 43.44 13.04 30.40
514.15 45.71 13.18 32.53
514.20 48.02 13.32 34.70
514.25 50.35 13.45 36.90
514.30 52.72 13.59 39.13
514.35 55.13 13.72 41.41
514.40 57.58 13.85 43.73
514.45 60.03 13.98 46.05
514.50 62.52 14.11 48.41
514.55 65.04 14.24 50.80
514.60 67.59 14.36 53.23
514.65 70.23 14.49 55.74
514.70 72.91 14.61 58.29
514.75 75.62 14.74 60.89
514.80 78.37 14.86 63.51
514.85 81.16 14.98 66.18
514.90 83.98 15.10 68.88
514.95 86.84 15.22 71.62
515.00 89.73 15.34 74.39
515.05 92.65 15.46 77.19
515.10 95.61 15.57 80.04
515.15 98.60 15.69 82.91
515.20 101.62 15.80 85.82
515.25 104.68 15.92 88.76
Corning CEPI - Detention Basin-4
Type II 24-hr 2 yr 24hr Storm Rainfall=3.38"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 11HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Stage-Area-Storage for Pond 3P: Detention Basin-4
Elevation
(feet)
Surface
(sq-ft)
Storage
(cubic-feet)
511.00 5 0
511.05 55 1
511.10 160 6
511.15 319 18
511.20 532 39
511.25 800 72
511.30 1,121 120
511.35 1,497 185
511.40 1,927 271
511.45 2,412 379
511.50 2,950 513
511.55 3,543 675
511.60 4,191 868
511.65 4,892 1,095
511.70 5,648 1,358
511.75 6,458 1,661
511.80 7,322 2,005
511.85 8,240 2,394
511.90 9,213 2,830
511.95 10,240 3,316
512.00 11,321 3,855
512.05 11,700 4,430
512.10 12,085 5,025
512.15 12,477 5,639
512.20 12,874 6,273
512.25 13,278 6,926
512.30 13,688 7,600
512.35 14,105 8,295
512.40 14,528 9,011
512.45 14,956 9,748
512.50 15,392 10,507
512.55 15,833 11,287
512.60 16,281 12,090
512.65 16,734 12,916
512.70 17,194 13,764
512.75 17,661 14,635
512.80 18,133 15,530
512.85 18,612 16,449
512.90 19,097 17,391
512.95 19,588 18,358
513.00 20,086 19,350
513.05 20,315 20,360
513.10 20,545 21,382
513.15 20,776 22,415
513.20 21,009 23,459
513.25 21,243 24,516
513.30 21,478 25,584
513.35 21,715 26,664
513.40 21,953 27,755
513.45 22,192 28,859
513.50 22,433 29,974
513.55 22,674 31,102
Elevation
(feet)
Surface
(sq-ft)
Storage
(cubic-feet)
513.60 22,918 32,242
513.65 23,162 33,394
513.70 23,408 34,558
513.75 23,655 35,735
513.80 23,903 36,924
513.85 24,152 38,125
513.90 24,403 39,339
513.95 24,656 40,565
514.00 24,909 41,804
514.05 25,082 43,054
514.10 25,256 44,313
514.15 25,431 45,580
514.20 25,606 46,856
514.25 25,782 48,140
514.30 25,958 49,434
514.35 26,135 50,736
514.40 26,313 52,047
514.45 26,491 53,368
514.50 26,669 54,697
514.55 26,849 56,035
514.60 27,029 57,381
514.65 27,209 58,737
514.70 27,390 60,102
514.75 27,572 61,476
514.80 27,755 62,860
514.85 27,938 64,252
514.90 28,121 65,653
514.95 28,305 67,064
515.00 28,490 68,484
515.05 28,909 69,919
515.10 29,331 71,375
515.15 29,756 72,852
515.20 30,185 74,351
515.25 30,616 75,871
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 12HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Summary for Subcatchment 1S: Pre-dev Det-4
Runoff = 82.14 cfs @ 12.14 hrs, Volume= 6.450 af, Depth= 3.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"
Area (ac) CN Description
* 25.660 82
25.660 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
21.6 Direct Entry, From spreadsheet
Subcatchment 1S: Pre-dev Det-4
Runoff
Hydrograph
Time (hours)
12011511010510095908580757065605550454035302520151050Flow (cfs)90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
10 yr 24hr Storm Rainfall=4.93"
Runoff Area=25.660 ac
Runoff Volume=6.450 af
Runoff Depth=3.02"
Tc=21.6 min
CN=82
82.14 cfs
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 13HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 1S: Pre-dev Det-4
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.50 0.08 0.00 0.00
3.00 0.17 0.00 0.00
4.50 0.27 0.00 0.00
6.00 0.39 0.00 0.00
7.50 0.54 0.00 0.15
9.00 0.72 0.03 0.68
10.50 1.01 0.12 1.87
12.00 3.27 1.59 53.27
13.50 3.94 2.15 6.14
15.00 4.21 2.38 3.56
16.50 4.39 2.54 2.52
18.00 4.54 2.67 2.11
19.50 4.66 2.78 1.70
21.00 4.76 2.86 1.43
22.50 4.85 2.94 1.35
24.00 4.93 3.02 1.27
25.50 4.93 3.02 0.00
27.00 4.93 3.02 0.00
28.50 4.93 3.02 0.00
30.00 4.93 3.02 0.00
31.50 4.93 3.02 0.00
33.00 4.93 3.02 0.00
34.50 4.93 3.02 0.00
36.00 4.93 3.02 0.00
37.50 4.93 3.02 0.00
39.00 4.93 3.02 0.00
40.50 4.93 3.02 0.00
42.00 4.93 3.02 0.00
43.50 4.93 3.02 0.00
45.00 4.93 3.02 0.00
46.50 4.93 3.02 0.00
48.00 4.93 3.02 0.00
49.50 4.93 3.02 0.00
51.00 4.93 3.02 0.00
52.50 4.93 3.02 0.00
54.00 4.93 3.02 0.00
55.50 4.93 3.02 0.00
57.00 4.93 3.02 0.00
58.50 4.93 3.02 0.00
60.00 4.93 3.02 0.00
61.50 4.93 3.02 0.00
63.00 4.93 3.02 0.00
64.50 4.93 3.02 0.00
66.00 4.93 3.02 0.00
67.50 4.93 3.02 0.00
69.00 4.93 3.02 0.00
70.50 4.93 3.02 0.00
72.00 4.93 3.02 0.00
73.50 4.93 3.02 0.00
75.00 4.93 3.02 0.00
76.50 4.93 3.02 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
78.00 4.93 3.02 0.00
79.50 4.93 3.02 0.00
81.00 4.93 3.02 0.00
82.50 4.93 3.02 0.00
84.00 4.93 3.02 0.00
85.50 4.93 3.02 0.00
87.00 4.93 3.02 0.00
88.50 4.93 3.02 0.00
90.00 4.93 3.02 0.00
91.50 4.93 3.02 0.00
93.00 4.93 3.02 0.00
94.50 4.93 3.02 0.00
96.00 4.93 3.02 0.00
97.50 4.93 3.02 0.00
99.00 4.93 3.02 0.00
100.50 4.93 3.02 0.00
102.00 4.93 3.02 0.00
103.50 4.93 3.02 0.00
105.00 4.93 3.02 0.00
106.50 4.93 3.02 0.00
108.00 4.93 3.02 0.00
109.50 4.93 3.02 0.00
111.00 4.93 3.02 0.00
112.50 4.93 3.02 0.00
114.00 4.93 3.02 0.00
115.50 4.93 3.02 0.00
117.00 4.93 3.02 0.00
118.50 4.93 3.02 0.00
120.00 4.93 3.02 0.00
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 14HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Summary for Subcatchment 2S: Post-Dev Det-4
Runoff = 120.67 cfs @ 12.01 hrs, Volume= 6.652 af, Depth= 3.11"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"
Area (ac) CN Description
* 25.660 83
25.660 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, From spreadsheet
Subcatchment 2S: Post-Dev Det-4
Runoff
Hydrograph
Time (hours)
12011511010510095908580757065605550454035302520151050Flow (cfs)130
120
110
100
90
80
70
60
50
40
30
20
10
0
Type II 24-hr
10 yr 24hr Storm Rainfall=4.93"
Runoff Area=25.660 ac
Runoff Volume=6.652 af
Runoff Depth=3.11"
Tc=10.0 min
CN=83
120.67 cfs
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 15HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 2S: Post-Dev Det-4
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.50 0.08 0.00 0.00
3.00 0.17 0.00 0.00
4.50 0.27 0.00 0.00
6.00 0.39 0.00 0.00
7.50 0.54 0.01 0.27
9.00 0.72 0.04 0.91
10.50 1.01 0.13 2.36
12.00 3.27 1.67 119.35
13.50 3.94 2.23 5.65
15.00 4.21 2.47 3.47
16.50 4.39 2.63 2.50
18.00 4.54 2.76 2.09
19.50 4.66 2.87 1.67
21.00 4.76 2.95 1.44
22.50 4.85 3.03 1.36
24.00 4.93 3.11 1.28
25.50 4.93 3.11 0.00
27.00 4.93 3.11 0.00
28.50 4.93 3.11 0.00
30.00 4.93 3.11 0.00
31.50 4.93 3.11 0.00
33.00 4.93 3.11 0.00
34.50 4.93 3.11 0.00
36.00 4.93 3.11 0.00
37.50 4.93 3.11 0.00
39.00 4.93 3.11 0.00
40.50 4.93 3.11 0.00
42.00 4.93 3.11 0.00
43.50 4.93 3.11 0.00
45.00 4.93 3.11 0.00
46.50 4.93 3.11 0.00
48.00 4.93 3.11 0.00
49.50 4.93 3.11 0.00
51.00 4.93 3.11 0.00
52.50 4.93 3.11 0.00
54.00 4.93 3.11 0.00
55.50 4.93 3.11 0.00
57.00 4.93 3.11 0.00
58.50 4.93 3.11 0.00
60.00 4.93 3.11 0.00
61.50 4.93 3.11 0.00
63.00 4.93 3.11 0.00
64.50 4.93 3.11 0.00
66.00 4.93 3.11 0.00
67.50 4.93 3.11 0.00
69.00 4.93 3.11 0.00
70.50 4.93 3.11 0.00
72.00 4.93 3.11 0.00
73.50 4.93 3.11 0.00
75.00 4.93 3.11 0.00
76.50 4.93 3.11 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
78.00 4.93 3.11 0.00
79.50 4.93 3.11 0.00
81.00 4.93 3.11 0.00
82.50 4.93 3.11 0.00
84.00 4.93 3.11 0.00
85.50 4.93 3.11 0.00
87.00 4.93 3.11 0.00
88.50 4.93 3.11 0.00
90.00 4.93 3.11 0.00
91.50 4.93 3.11 0.00
93.00 4.93 3.11 0.00
94.50 4.93 3.11 0.00
96.00 4.93 3.11 0.00
97.50 4.93 3.11 0.00
99.00 4.93 3.11 0.00
100.50 4.93 3.11 0.00
102.00 4.93 3.11 0.00
103.50 4.93 3.11 0.00
105.00 4.93 3.11 0.00
106.50 4.93 3.11 0.00
108.00 4.93 3.11 0.00
109.50 4.93 3.11 0.00
111.00 4.93 3.11 0.00
112.50 4.93 3.11 0.00
114.00 4.93 3.11 0.00
115.50 4.93 3.11 0.00
117.00 4.93 3.11 0.00
118.50 4.93 3.11 0.00
120.00 4.93 3.11 0.00
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 16HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Summary for Pond 3P: Detention Basin-4
Inflow Area = 25.660 ac, 0.00% Impervious, Inflow Depth = 3.11" for 10 yr 24hr Storm event
Inflow = 120.67 cfs @ 12.01 hrs, Volume= 6.652 af
Outflow = 81.56 cfs @ 12.10 hrs, Volume= 6.652 af, Atten= 32%, Lag= 5.2 min
Primary = 15.00 cfs @ 12.10 hrs, Volume= 4.481 af
Secondary = 66.57 cfs @ 12.10 hrs, Volume= 2.171 af
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Peak Elev= 514.86' @ 12.10 hrs Surf.Area= 27,964 sf Storage= 64,454 cf
Plug-Flow detention time= 18.9 min calculated for 6.652 af (100% of inflow)
Center-of-Mass det. time= 18.9 min ( 833.6 - 814.7 )
Volume Invert Avail.Storage Storage Description
#1 511.00' 75,871 cf Custom Stage Data (Irregular) Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft)
511.00 5 16.0 0 0 5
512.00 11,321 454.0 3,855 3,855 16,389
513.00 20,086 578.0 15,496 19,350 26,585
514.00 24,909 992.0 22,454 41,804 78,315
515.00 28,490 1,006.0 26,679 68,484 80,754
515.25 30,616 1,030.0 7,387 75,871 84,651
Device Routing Invert Outlet Devices
#1 Primary 511.00'18.0" Round Culvert
L= 41.0' RCP, end-section conforming to fill, Ke= 0.500
Inlet / Outlet Invert= 511.00' / 510.71' S= 0.0071 '/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 1.77 sf
#2 Secondary 513.00'10.0' long x 20.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=14.98 cfs @ 12.10 hrs HW=514.85' (Free Discharge)
1=Culvert (Inlet Controls 14.98 cfs @ 8.47 fps)
Secondary OutFlow Max=66.05 cfs @ 12.10 hrs HW=514.85' (Free Discharge)
2=Broad-Crested Rectangular Weir (Weir Controls 66.05 cfs @ 3.57 fps)
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 17HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Pond 3P: Detention Basin-4
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
12011511010510095908580757065605550454035302520151050Flow (cfs)130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=25.660 ac
Peak Elev=514.86'
Storage=64,454 cf
120.67 cfs
81.56 cfs
15.00 cfs
66.57 cfs
Pond 3P: Detention Basin-4
Total
Primary
Secondary
Stage-Discharge
Discharge (cfs)
1009080706050403020100Elevation (feet)515
514
513
512
511
Culvert
Broad-Crested Rectangular Weir
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 18HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Pond 3P: Detention Basin-4
Surface
Storage
Stage-Area-Storage
Storage (cubic-feet)
70,00060,00050,00040,00030,00020,00010,0000
Surface/Horizontal/Wetted Area (sq-ft)
30,00028,00026,00024,00022,00020,00018,00016,00014,00012,00010,0008,0006,0004,0002,0000
Elevation (feet)515
514
513
512
511
Custom Stage Data
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 19HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Hydrograph for Pond 3P: Detention Basin-4
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 511.00 0.00 0.00 0.00
3.00 0.00 0 511.00 0.00 0.00 0.00
6.00 0.00 0 511.00 0.00 0.00 0.00
9.00 0.91 331 511.43 0.81 0.81 0.00
12.00 119.35 51,857 514.39 57.23 13.83 43.39
15.00 3.47 5,666 512.15 4.47 4.47 0.00
18.00 2.09 1,657 511.75 2.19 2.19 0.00
21.00 1.44 843 511.59 1.46 1.46 0.00
24.00 1.28 693 511.55 1.29 1.29 0.00
27.00 0.00 0 511.00 0.00 0.00 0.00
30.00 0.00 0 511.00 0.00 0.00 0.00
33.00 0.00 0 511.00 0.00 0.00 0.00
36.00 0.00 0 511.00 0.00 0.00 0.00
39.00 0.00 0 511.00 0.00 0.00 0.00
42.00 0.00 0 511.00 0.00 0.00 0.00
45.00 0.00 0 511.00 0.00 0.00 0.00
48.00 0.00 0 511.00 0.00 0.00 0.00
51.00 0.00 0 511.00 0.00 0.00 0.00
54.00 0.00 0 511.00 0.00 0.00 0.00
57.00 0.00 0 511.00 0.00 0.00 0.00
60.00 0.00 0 511.00 0.00 0.00 0.00
63.00 0.00 0 511.00 0.00 0.00 0.00
66.00 0.00 0 511.00 0.00 0.00 0.00
69.00 0.00 0 511.00 0.00 0.00 0.00
72.00 0.00 0 511.00 0.00 0.00 0.00
75.00 0.00 0 511.00 0.00 0.00 0.00
78.00 0.00 0 511.00 0.00 0.00 0.00
81.00 0.00 0 511.00 0.00 0.00 0.00
84.00 0.00 0 511.00 0.00 0.00 0.00
87.00 0.00 0 511.00 0.00 0.00 0.00
90.00 0.00 0 511.00 0.00 0.00 0.00
93.00 0.00 0 511.00 0.00 0.00 0.00
96.00 0.00 0 511.00 0.00 0.00 0.00
99.00 0.00 0 511.00 0.00 0.00 0.00
102.00 0.00 0 511.00 0.00 0.00 0.00
105.00 0.00 0 511.00 0.00 0.00 0.00
108.00 0.00 0 511.00 0.00 0.00 0.00
111.00 0.00 0 511.00 0.00 0.00 0.00
114.00 0.00 0 511.00 0.00 0.00 0.00
117.00 0.00 0 511.00 0.00 0.00 0.00
120.00 0.00 0 511.00 0.00 0.00 0.00
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 20HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Stage-Discharge for Pond 3P: Detention Basin-4
Elevation
(feet)
Discharge
(cfs)
Primary
(cfs)
Secondary
(cfs)
511.00 0.00 0.00 0.00
511.05 0.01 0.01 0.00
511.10 0.04 0.04 0.00
511.15 0.10 0.10 0.00
511.20 0.18 0.18 0.00
511.25 0.29 0.29 0.00
511.30 0.41 0.41 0.00
511.35 0.55 0.55 0.00
511.40 0.71 0.71 0.00
511.45 0.88 0.88 0.00
511.50 1.07 1.07 0.00
511.55 1.27 1.27 0.00
511.60 1.48 1.48 0.00
511.65 1.71 1.71 0.00
511.70 1.95 1.95 0.00
511.75 2.20 2.20 0.00
511.80 2.45 2.45 0.00
511.85 2.72 2.72 0.00
511.90 2.99 2.99 0.00
511.95 3.28 3.28 0.00
512.00 3.56 3.56 0.00
512.05 3.86 3.86 0.00
512.10 4.15 4.15 0.00
512.15 4.46 4.46 0.00
512.20 4.76 4.76 0.00
512.25 5.07 5.07 0.00
512.30 5.37 5.37 0.00
512.35 5.68 5.68 0.00
512.40 5.98 5.98 0.00
512.45 6.29 6.29 0.00
512.50 6.58 6.58 0.00
512.55 6.87 6.87 0.00
512.60 7.16 7.16 0.00
512.65 7.43 7.43 0.00
512.70 7.69 7.69 0.00
512.75 7.94 7.94 0.00
512.80 8.17 8.17 0.00
512.85 8.37 8.37 0.00
512.90 8.54 8.54 0.00
512.95 8.66 8.66 0.00
513.00 8.62 8.62 0.00
513.05 9.19 8.89 0.30
513.10 10.00 9.15 0.85
513.15 10.96 9.40 1.56
513.20 12.05 9.65 2.40
513.25 13.24 9.89 3.36
513.30 14.54 10.12 4.42
513.35 15.93 10.35 5.58
513.40 17.41 10.58 6.83
513.45 18.95 10.80 8.15
513.50 20.56 11.01 9.55
513.55 22.24 11.22 11.01
Elevation
(feet)
Discharge
(cfs)
Primary
(cfs)
Secondary
(cfs)
513.60 23.98 11.43 12.55
513.65 25.71 11.64 14.07
513.70 27.47 11.84 15.64
513.75 29.28 12.03 17.24
513.80 31.07 12.18 18.89
513.85 33.00 12.33 20.67
513.90 34.97 12.48 22.50
513.95 37.00 12.62 24.38
514.00 39.06 12.76 26.30
514.05 41.23 12.90 28.32
514.10 43.44 13.04 30.40
514.15 45.71 13.18 32.53
514.20 48.02 13.32 34.70
514.25 50.35 13.45 36.90
514.30 52.72 13.59 39.13
514.35 55.13 13.72 41.41
514.40 57.58 13.85 43.73
514.45 60.03 13.98 46.05
514.50 62.52 14.11 48.41
514.55 65.04 14.24 50.80
514.60 67.59 14.36 53.23
514.65 70.23 14.49 55.74
514.70 72.91 14.61 58.29
514.75 75.62 14.74 60.89
514.80 78.37 14.86 63.51
514.85 81.16 14.98 66.18
514.90 83.98 15.10 68.88
514.95 86.84 15.22 71.62
515.00 89.73 15.34 74.39
515.05 92.65 15.46 77.19
515.10 95.61 15.57 80.04
515.15 98.60 15.69 82.91
515.20 101.62 15.80 85.82
515.25 104.68 15.92 88.76
Corning CEPI - Detention Basin-4
Type II 24-hr 10 yr 24hr Storm Rainfall=4.93"190109 Corning CEPI - Det-4
Printed 1/9/2019Prepared by Banks Engineering
Page 21HydroCAD® 10.00-20 s/n 08698 © 2017 HydroCAD Software Solutions LLC
Stage-Area-Storage for Pond 3P: Detention Basin-4
Elevation
(feet)
Surface
(sq-ft)
Storage
(cubic-feet)
511.00 5 0
511.05 55 1
511.10 160 6
511.15 319 18
511.20 532 39
511.25 800 72
511.30 1,121 120
511.35 1,497 185
511.40 1,927 271
511.45 2,412 379
511.50 2,950 513
511.55 3,543 675
511.60 4,191 868
511.65 4,892 1,095
511.70 5,648 1,358
511.75 6,458 1,661
511.80 7,322 2,005
511.85 8,240 2,394
511.90 9,213 2,830
511.95 10,240 3,316
512.00 11,321 3,855
512.05 11,700 4,430
512.10 12,085 5,025
512.15 12,477 5,639
512.20 12,874 6,273
512.25 13,278 6,926
512.30 13,688 7,600
512.35 14,105 8,295
512.40 14,528 9,011
512.45 14,956 9,748
512.50 15,392 10,507
512.55 15,833 11,287
512.60 16,281 12,090
512.65 16,734 12,916
512.70 17,194 13,764
512.75 17,661 14,635
512.80 18,133 15,530
512.85 18,612 16,449
512.90 19,097 17,391
512.95 19,588 18,358
513.00 20,086 19,350
513.05 20,315 20,360
513.10 20,545 21,382
513.15 20,776 22,415
513.20 21,009 23,459
513.25 21,243 24,516
513.30 21,478 25,584
513.35 21,715 26,664
513.40 21,953 27,755
513.45 22,192 28,859
513.50 22,433 29,974
513.55 22,674 31,102
Elevation
(feet)
Surface
(sq-ft)
Storage
(cubic-feet)
513.60 22,918 32,242
513.65 23,162 33,394
513.70 23,408 34,558
513.75 23,655 35,735
513.80 23,903 36,924
513.85 24,152 38,125
513.90 24,403 39,339
513.95 24,656 40,565
514.00 24,909 41,804
514.05 25,082 43,054
514.10 25,256 44,313
514.15 25,431 45,580
514.20 25,606 46,856
514.25 25,782 48,140
514.30 25,958 49,434
514.35 26,135 50,736
514.40 26,313 52,047
514.45 26,491 53,368
514.50 26,669 54,697
514.55 26,849 56,035
514.60 27,029 57,381
514.65 27,209 58,737
514.70 27,390 60,102
514.75 27,572 61,476
514.80 27,755 62,860
514.85 27,938 64,252
514.90 28,121 65,653
514.95 28,305 67,064
515.00 28,490 68,484
515.05 28,909 69,919
515.10 29,331 71,375
515.15 29,756 72,852
515.20 30,185 74,351
515.25 30,616 75,871