SW6210503_Design Calculations (Storm Drainage)_20211110

STORM DRAINAGE / HYDRAULIC GRADE LINE
ANALYSIS (10 YEAR)
Townsend Estates
PRELIM
REVISION
LOCATION
Near Raeford, North Carolina
RECORD
OTHER
CHECKED BY
CSB
(SPECIFY)
STORM DRAINAGE SCHEDULE CONTINUED
AREAS
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STORM DRAINAGE / HYDRAULIC GRADE LINE
ANALYSIS (10 YEAR)
PROJECT NAME
Townsend Estates
PRELIM
CONSTR X
REVISION
RECORD
OTHER
(SPECIFY)
LOCATION
Near Raeford, North Carolina
CHECKED BY
CSB
0.013,S70RM
226
26
DRAINAGE SCHEDULE -CONTINUED
09.29 218.05
45
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NAME
n=
9=
h=
0.013
226
26
HYDRAULIC GRADE LI
PIPE
AREA
FT
HYDRAULIC
RADIUS
FT
FROM TO
Cl 32
Cl 33
Cl 33
Cl 34
1.2272
1.2272
0.3125
0.3125
Cl 34
CI1
1.2272
0.3125
CI1
Cl2
1.2272
0.3125
Cl2
CI3
1.7671
0.3750
CI3
Cl4
1.7671
0.3750
NAME
TE
-08-21
OJECT NO
51
P
ECKED BY
INLET W.S. ELEV.
BEND
OUTLET
OUTLET INLET USE
FLOW
FREE-
HGL
�TO
LOSS
W.S. ELEV
CONTOL CONTROL
CONDITION
BOARD
CROWN
COMMENTS
CAPACITYVS
K
(FT1
fFTI fFTI fFTI
CONTROL
(FT1
DISCHARGE
---------------
21902
--
------
-----
--------
------
--------
------
--------
------
--------
------
---------------
--------
------
211.90
211.19
211.90
--------
------
--------
------
---------------
---------------
PHASE
X/
N
I
DESIGN CRITERIA:
1. DESIGN FOR THE 10 YR STORM
2. ASSUME TIME OF CONCENTRATION TO
AN INDIVIDUAL INLET = 5 MIN. (Unless otherwise noted)
3. INTENSITY = g/(h+T), FOR 10 YR STORM
(9 and h were derived from Raleigh -Durham Intensity -
Duration -Frequency Charts, REF: NC Erosion and
Sediment Control Planning and Design Manual)
4. MANNINGS "n" FACTOR= 0.013
5. RUNOFF COEFICIENT Cr--0.50 (Per CR-7107)
Date: 10I52021 Time: —AM AM Pape 3 of 6

• - • -
r
PROJECT NAME
Townsend Estates
• -
- •
DATE
02-08-21
PROJECT NO
1651
DESIGN PHASE
PRELIM
CONSTR
REVISION
/ X /
LOCATION
Near Raeford, North Carolina
BY
CJP
RECORD
OTHER
CHECKED BY
CSB
(SPECIFY)
n=
g=
h=
o.o13
226
26
STORM DRAINAGE SCHEDULE
CONTINUED
AREAS
INLETS
INLET
AREA
AC
INLET
Cc
RUNOFF
COEFF.
INLET
DISCHARGE
CFS)
0 (+)
UPSTREAM
BYPASS
(CFS)
0(-)
INLET
BYPASS
(CFS)
CAPTURED
INLET
DISCHARGE
(CFS)
TOTAL
AREAS
(AC
INLET
TIME
MIN
PIPE
TIME
MIN
Tc
TIME
OFCONC.
MIN
I
INTENSITY
IN/HR
Cc
RUNOFF
COEFF.
FROM TO
3.96
o.o0
0.00
RI
P02
RI
1.00
0.99
3.96
1.00
5.00
0.00
5.00
7.29
0.99
Page 4 of 6

" 6 " • 6 " •
DESIGN PHASE
r02-08-21
PRELIMCT
NAME
PROJECT NO
CONSTR
/ Xsend
Estates
1651
REVISION
/ /ION
7Near
BV
RECORD / /Raeford,
North Carolina
CJP
OTHER
CHECKED
BY
(SPECIFY)
CSB
n=
0.013
STORM DRAINAGE SCHEDULE - CONTINUED
9=
226
h=
26
O
O
SIDE-
CAPACITY
SEGMENT
UPPER
LOWER
UPSTREAM
TOP
BOX
COVER
Cl COVER
BELOW
FROM
TO
DISCHARGE
STREAM
SLOPE
DIA.
(FULL)
V FULL
LENGTH
TIME
INV.
INV.
ELEV.
DEPTH
SUBGRADE
CFS)
(CFS)
(IN)
(CFS)
(FPS
FT
MIN
FT
FT
FT
8"
57
211.00
RI
P02
84.77
0.00
0.0262
36
108.1
15.3
0.06
205.50
204.00
5.50
1.38
Page 5 of 6

NAME
n= 0.013 HYDRAULIC GRADE LI
9= 226
h= 26
PIPE HYDRAULIC
FROM TO AREA RADIUS
FT FT
RI PO2 7.0686 0.7500
NAME
TE
-08-21
OJECT NO
51
P
ECKED BY
BEND OUTLET OUTLET INLET USE FLOW FREE- HGL
LOSS W.S. ELEV CONTOL CONTROL CONDITION BOARD TO CROWN COMMENTS CAPACITYVS
K FT FT FT FT CONTROL FT DISCHARGE
0.00 206.40 208.64 213.20 213.20 INLET (2.20) (4.70) OVERFLOW 23.29
PHASE
X/
N
DESIGN CRITERIA:
1. DESIGN FOR THE 10 YR STORM
2. ASSUME TIME OF CONCENTRATION TO
AN INDIVIDUAL INLET = 5 MIN. (Unless otherwise noted)
3. INTENSITY = g/(h+T), FOR 10 YR STORM
(9 and h were derived from Raleigh -Durham Intensity -
Duration -Frequency Charts, REF: NC Erosion and
Sediment Control Planning and Design Manual)
4. MANNINGS "n" FACTOR= 0.013
Oare: 10ISI2021 Time: —AM AM Page 6 of 6