SW6230901_Design Calculations_20231115 (7)

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS(10 YEAR) 6-8-2023 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X/
ROYAL FARMS PH II 1960 REVISION / //
LOCATION BY RECORD / /
Cumberland County,North Carolina BPB OTHER / //
CHECKED BY (SPECIFY)
CSB
n= 0.013 STORM DRAINAGE SCHEDULE CONTINUED —r.226
h= 26
INLET 0(+) Q(-) CAPTURED Tc I Cc
INLET Cc INLET UPSTREAM INLET INLET TOTAL INLET PIPE TIME RUNOFF
FROM TO AREAS AREA RUNOFF DISCHARGE BYPASS BYPASS DISCHARGE AREAS TIME TIME OF CONC. INTENSITY COEFF.
(INLETS) (AC) COEFF. (CFS) (CFS) (CFS) (CFS) (AC) (MIN) (MIN) (MIN) (IN/HR)
PIPE 1 IN PIPE 1 OUT PIPE 1 IN
PIPE 2 IN PIPE 2 OUT PIPE 2 IN
1960-Storm Drainage for Spread.xls 10-YEAR Date:11/15/2023 Time:7:13 AM Pagel of 4

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS(10 YEAR) 6-8-2023 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X/
ROYAL FARMS PH II 1960 REVISION / //
LOCATION BY RECORD / /
Cumberland County,North Carolina BPB OTHER / //
CHECKED BY (SPECIFY)
CSB
n= 0.013 STORM DRAINAGE SCHEDULE-CONTINUED
g= 226
h= 26
Q Q UPSTREAM
SIDE- CAPACITY SEGMENT UPPER LOWER TOP
FROM TO DISCHARGE STREAM SLOPE DIA. (FULL) V FULL LENGTH TIME INV. INV. ELEV.
(CFS) (CFS) (IN) • (CFS) (FPS) (FT) (MIN) (FT) (FT) (FT)
PIPE 1 IN PIPE 1 OUT 8.24 0.00 0.0050 24 16.0 5.1 50 0.16 148.95 148.70 151.71
PIPE 2 IN PIPE 2 OUT 8.05 0.00 0.0040 18 6.6 3.8 50 0.22 146.60 146.40 149.30
1960-Storm Drainage for Spread.ols 10-YEAR Date:11/15/2023 Time:7:13 AM Page 2 of 4

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS(10 YEAR) 6-8-2023 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X/
ROYAL FARMS PH II 1960 REVISION / //
LOCATION BY RECORD / /
Cumberland County,North Carolina BPB OTHER / //
CHECKED BY (SPECIFY)
CSB
n= 0.013 HYDRAULIC GRADE LINE CONTINUED
g= 226 BEND LOSS K'S
h= 26 90 DEG=0.7 30 DEG=0.28
60 DEG=0.55 15 DEG=0.10
PIPE HYDRAULIC SIDESTREAM HEAD LOSS BEND FRICTION FRICTION
FROM TO AREA RADIUS SUMMATION Hf He He Hb Ht LOSS SLOPE VELOCITY
(FT) (FT) (CFS) K (FT/FT) (FPS)
PIPE 1 IN PIPE 1 OUT 3.1416 0.5000 0.00 0.07 0.03 0.04 0.01 0.14 0.10 0.0013 2.61
PIPE 2 IN PIPE 2 OUT 1.7671 0.3750 0.00 0.29 0.08 0.11 0.03 0.52 0.10 0.0058 4.54
1960-Storm Drainage for Spread.xls 10-YEAR Date:11/15/2023 Time:7:13AM Page 3 of 4

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS(10 YEAR) 6-8-2023 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X/
ROYAL FARMS PH II 1960 REVISION / //
LOCATION BY RECORD / /
Cumberland County,North Carolina BPB OTHER / //
CHECKED BY (SPECIFY)
CSB
DESIGN CRITERIA:
n= 0.013 HYDRAULIC GRADE LINE-CONTINUED 1.DESIGN FOR THE 10 YR STORM
g= 226 2.ASSUME TIME OF CONCENTRATION TO
h= 26 AN INDIVIDUAL INLET=5 MIN.(Unless otherwise noted)
_ INLET W.S.ELEV. 3.INTENSITY=g/(h+T),FOR 10 YR STORM
OUTLET OUTLET INLET USE FLOW FREE- (g and h were derived from Raleigh-Durham Intensity-
FROM TO W.S.ELEV CONTOL CONTROL CONDITION I BOARD COMMENTS Duration-Frequency Charts,REF:NC Erosion and
(FT) (FT) (FT) (FT) CONTROL (FT) Sediment Control Planning and Design Manual)
4.MANNINGS"n"FACTOR=0.013
PIPE 1 IN PIPE 1 OUT 150.30 150.44 150.25 150.44 OUTLET 1.27 OK 5.RUNOFF COEFICIENT Cc=0.50(Per CR-7107)
PIPE 2 IN PIPE 2 OUT 147.60 148.12 148.25 148.25 INLET 1.05 OK
1960-Storm Drainage for Spread.ols 10-YEAR Date:11/15/2023 Time:7:13 AM Page 4 of 4