20150995 Ver 2_12_Drainage_Calculations_Park_Depot_2015-05-21_20190328

Date: 5/13/2015
Project Number: 12622011
County: Wake
Description
Park Depot GW
Kimley-Horn & Associates, Inc.
Raleigh, NC
Ditch Computation Sheet
Sheet 1 of
Designed By: BTV
Checked By: LDR
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K:\RAL_Roadway\012622011 - Park_Depot_Greenway\Plan\Hydraulics\Calculations\DitchCompSheet.xls

PIPE DATA SHEET
Date 5/20/2015
Project No. Park Depot �w I.D. No.
Station 11+55 -L-
Skew 80 °
Size/Type Pipe 18"RCP-III
Type Entrance Grooved End Projecting
Direction of Flow Rt to Lt
Hydrological Method Rational
HW Control Elev
Shoulder
Elev 354.48
H.W.
LSo
Inv Flav
County
Wake
L = 48.0
Designed By BTV
r'�_ E12V. 354.66
H
T.W.
,� .,,.. Elev. 347.80
Sheet 1 of 6
Checked By
PLAN SUMMARY DATA
Drainage Area 3.30 ac
Design Freq. 10 yr
Design Disch. 6.90 cfs
Design H.W. Elev. 349.76 ft
Q25 Disch. 7.50 cfs
Q25 H.W. Elev. 349.85 ft
Overtopping Freq. N/A yr
Overtopping Disch. N/A cfs
Overtopping Elev. N/A ft
Overtopping Sta. N/A
• �• • • �•
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' � � � ' � � __- �� ���� 1 1 1 . � � . . . �i � - � •
• � � m�l __- 1• � 1� 1• : : 1� 1 •�� •• : . 11 • - � •
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SUMMARY AND RECOMMENDATIONS : Tc = 10 min, I�o = 5.9 in/hr, 125 = 6.5 in/hr, C= 0.35

PIPE DATA SHEET
Date 5/20/2015
Project No. Park Depot �w I.D. No.
Station 17+39 -L-
Skew 67 °
Size/Type Pipe 24 "RCP-IV
Type Entrance Grooved End Projecting
Direction of Flow Rt to Lt
Hydrological Method Rational
HW Control Elev
Shoulder
Elev 2s.o�
H.W.
LSo
Inv Flav
County
Wake
L = 33.0
Designed By BTV
r'�_ E12V. 361.18
H
T.W.
,� .,,.. Elev. 342.40
Sheet 2 of 6
Checked By
PLAN SUMMARY DATA
Drainage Area 6.00 ac
Design Freq. 10 yr
Design Disch. 10.70 cfs
Design H.W. Elev. 344.46 ft
Q25 Disch. 11.70 cfs
Q25 H.W. Elev. 344.55 ft
Overtopping Freq. N/A yr
Overtopping Disch. N/A cfs
Overtopping Elev. N/A ft
Overtopping Sta. N/A
• �• • • �•
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' � � ��__- 1 • 1 :1 ����� 1 1 : � � . : • - � •
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SUMMARY AND RECOMMENDATIONS : Tc = 10 min, I�o = 5.9 in/hr, 125 = 6.5 in/hr, C= 0.30

PIPE DATA SHEET
Date 5/20/2015
Project No. Park Depot �w I.D. No.
Shoulder
Elev 346.s1
Station 19+27 -L- I
Skew 79 ° '
Size/Type Pipe 2@ 24 "RCP-IV H•W•
Type Entrance Square-Edge w/ Headwall LSo
Direction of Flow Rt to Lt
County
Hydrological Method Rational Inv. Elev. .,� .
HW Control Elev
Wake
L = 26.5
Designed By BTV
r'�_ E12V. 347.55
H
T.W.
,� .,,.. Elev. 342.70
Sheet 3 of 6
Checked By
PLAN SUMMARY DATA
Drainage Area 12.20 ac
Design Freq. 10 yr
Design Disch. 18.00 cfs
Design H.W. Elev. 345.31 ft
Q25 Disch. 20.20 cfs
Q25 H.W. Elev. 345.44 ft
Overtopping Freq. >100 yr
Overtopping Disch. 27.10 cfs
Overtopping Elev. 345.80 ft
Overtopping Sta. 19+78
• �• • • �•
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ml . 11 __- � ' � ����� 1 1 � � 1. � - � •
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SUMMARY AND RECOMMENDATIONS : Tc = 15 min, I�o = 4.9 in/hr, 125 = 5.5 in/hr, C= 0.30

PIPE DATA SHEET
Date 5/20/2015
Project No. Park Depot �w I.D. No.
Station 27+56 -L-
Skew 68 °
Size/Type Pipe 18 "RCP-IV
Type Entrance Grooved End Projecting
Direction of Flow Rt to Lt
Hydrological Method Rational
HW Control Elev
Shoulder
Elev 343.59
H.W.
LSo
Inv Flav
County
Wake
L = 33.0
Designed By BTV
r'�_ EI2V. 343.38
H
T.W.
,� .,,.. Elev. 339.80
Sheet 4 of 6
Checked By
PLAN SUMMARY DATA
Drainage Area 1.74 ac
Design Freq. 10 yr
Design Disch. 3.10 cfs
Design H.W. Elev. 340.98 ft
Q25 Disch. 3.40 cfs
Q25 H.W. Elev. 341.03 ft
Overtopping Freq. >100 yr
Overtopping Disch. 11.16 cfs
Overtopping Elev. 342.30 ft
Overtopping Sta. 26+95
• �• • • �•
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ml �1 __- 1 . 1� 1� 1 . �1 �1 1 1 1 1 1 . �� � - � •
' � � � � � __- � 1 • • 1� 1 1 ��� � � � . � . . � - � •
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SUMMARY AND RECOMMENDATIONS : Tc = 10 min, I�o = 5.9 in/hr, 125 = 6.5 in/hr, C= 0.30

PIPE DATA SHEET
Date 5/20/2015
Project No. Park Depot �w I.D. No.
Station 28+85 -L-
Skew 83 °
Size/Type Pipe 15 "RCP-IV
Type Entrance Grooved End Projecting
Direction of Flow Rt to Lt
Hydrological Method Rational
HW Control Elev
Shoulder
Elev 33s.92
H.W.
LSo
Inv Flav
County
Wake
L = 28.0
Designed By BTV
r'�_ EI2V. 338.92
H
T.W.
,� .,,.. Elev. 336.21
Sheet 5 of 6
Checked By
PLAN SUMMARY DATA
Drainage Area 0.49 ac
Design Freq. 10 yr
Design Disch. 1.45 cfs
Design H.W. Elev. 337.03 ft
Q25 Disch. 1.60 cfs
Q25 H.W. Elev. 337.06 ft
Overtopping Freq. >100 yr
Overtopping Disch. 7.27 cfs
Overtopping Elev. 338.41 ft
Overtopping Sta. 28+96
• �• • • �•
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. . ��__- � 1 .. 1� 1 � : 1 : 1 : � � 1 1 � �� � - � •
•• m •1 __- 1� 1•• 1� 1 1 1:: 1:: �� 1 1 1��1 : • - � •
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SUMMARY AND RECOMMENDATIONS : Tc = 10 min, I�o = 5.9 in/hr, 125 = 6.5 in/hr, C= 0.50

PIPE DATA SHEET
Date 5/20/2015
Project No. Park Depot �w I.D. No.
Station 29+45 -L-
Skew 90 °
Size/Type Pipe 15 "RCP-IV
Type Entrance Grooved End Projecting
Direction of Flow Rt to Lt
Hydrological Method Rational
HW Control Elev
Shoulder
Elev 339.02
H.W.
LSo
Inv Flav
County
Wake
L = 28.0
Designed By BTV
r'�_ EI2V. 338.97
H
T.W.
,� .,,.. Elev. 336.05
Sheet 6 of 6
Checked By
PLAN SUMMARY DATA
Drainage Area 0.47 ac
Design Freq. 10 yr
Design Disch. 1.36 cfs
Design H.W. Elev. 336.92 ft
Q25 Disch. 1.50 cfs
Q25 H.W. Elev. 336.95 ft
Overtopping Freq. >100 yr
Overtopping Disch. 8.55 cfs
Overtopping Elev. 338.65 ft
Overtopping Sta. 29+34
• �• • • �•
- : • - - • - -. � . ' ' �� �� • • ���� _ . •
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• • ml �__- 1 1 1 . 1� 1 � . 1 :. 1 :. � � 1 1 1 . . ' � � - � •
• • m�l __- 1 � 1 • 1� 1 1 1 :: 1 :: � � 1 1 1 1 . • .. • - � •
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SUMMARY AND RECOMMENDATIONS : Tc = 10 min, I�o = 5.9 in/hr, 125 = 6.5 in/hr, C= 0.49