HomeMy WebLinkAboutDrainage Reports - 05/01/1985 (2)No Text
FINAL DRAINAGE REPORT
FOR
8AINTgEE COMMERCIAL P.U.D., PHASE II
MARCH, 1985
v w~
Prepared by: Parsons & Associates
432 Link Lane Plaza
Fort Collins, Colorado 80524 '
303-221-2400
Project Number: 85.07 RNf
:FINAL DRAINAGE REPORT
FOR
RAINTREE COMMERCIAL P.U,%}., PHASE II
This report has been prepared to describe the procedures and results
of astormwater drainage study of Raintree Commercial P.U°D°, Phase
II. A drainage plan showing the grading, sub -catchment basins, and
stormwater drainage improvements is attached. Methods used in this
study comply with the requirements set forth in the City of Fort
Collins' "Storm Drainage Design Criteria" and the calculations are
contained in an appendix to this report.
The project site consists of approximately seven acres of
undeveloped land lying West of Shields Street, approximately 500
feet North of Drake Road in Southwest Fort Collins. Adjacent
properties are currently undeveloped, but the land to the North and
West has an approved multi -family residential P.U.D. and to the
South, Raintree Commercial P.U°D., Phase I, has been approved.
Stormwater drainage design for the project site conforms to and is
described in the "Stormwater Drainage Report for Raintree P"U^D.'/
(Taranto, Stanton, & Tagge, 1980) and the ''Addendum to Stormwater
Drainage Report for Raintree P.U°D." (Parsons & Associates, 1985).
Since off -site detention is being provided in Ponds oA" and 'B» to
the West of Raintree Drive, the detention ponds on -site are designed
only to reduce flows based on off -site storm sewer capacity. The
storm sewers are designed to become part of the storm sewer and
detention system of Raintree P.U.D., as shown in the "Addendum". If
R i t --�i w neces .1 'Instruct those por ions o e 0 -site
----����
4chael F. Jon��, Project Engineer
�
+��y A. wynne,'�°E. No. 14961
�
X� ����
� �^���1�� V �
APPENDIX TO
FINAL DRAINAGE REPORT
FOR
8AINTREE COMMERCIAL P°U°D., PHASE I
Sub -basin Areas
Runoff Coefficients
Detention Volumes
Motbods of Calculation
�
PARSONS &
Ia ASSOCIATES
CONSULTING ENGINEERS
Ft. Collins. Coloudo 80524
Ow
CLIENT 8
/f� JOB NO. S, 0� GZ
PROJECT 1 �1K 11 2. 51 C *in&(I &kz CALCULATIONS FOR Va-,tt'i ��Gr
MADE BY i� DATE: CHECKED BY DATE SHEET OF
U
a PARSONS &
►ems ASSOCIATES
CONSULTING ENGINEERS
Ft. Collins. Colorado 80520
CLIENT
PROJECT
i
MADE BY DATE - J CHECKED BY
JOB NO. P7y• 0-7 14
CALCULATIONS FOR
DATE SHEET OF
NO
PARSONS & CLIENT JOB �7�+ O.-. 0 � 1'
►a ASSOCIATES PROJECT CALCULATIONS FOR r �y' i 1� N `'wo
CONSULTING ENGINEERS
Ft. Collins.Colorado 80520
MADE BY�_ DATE 3*"S xo CHECKED BY_ DATE SHEET OF
t ...�
AREA: 2.8993
f
C: 8.8400
�h.
A REL: 1.7408
r
T :5.8000
T :25.e00e
T :45.0000
I :8.8080
I :4.5800
I :3.23@0
01:7.1198
__.
01:17.6341
8I:10r0955
t r -7
VI:5,290.2360
VI:15,143.3006
VI:19,223.3951
,....__......_..�
VR:522.8888
VR:2,610.0880
YR:4,698.8000
D :4,768.2360
D :12,533.3806
D :14,525.3951
T :10.0008
T :30.0000
T :58.0880
I :7.2980
I :4.1780
I :3.00�8
01:15.8707
91:9.1918
9I:6.6128
i
V1:9,522.4248
VI:16,545.2131
VI:19,838.3850
J
YR-11044.0000
VR:3,132.0000
VR:5,220.0000
ri....._'.....;
D :8,478.4248
➢ :13,413.2131
D :14,618.3850
T :15.0000
T :35.0000
T :55.0800
i
:6.0000
I :3.7900
I :2.7900
'
91:13,2256
91:8.3542
AI; 6.1499
_.......�
V1:11,983.@31A
VI:17,543.7451
VI:2@,294.6E79
VR:1,566.0000
YR:3,654.0008
YR:5,742.8006
D :19,337.6310
D :13,889.7451
D :14,552.6679
1
T :20.0000
T :40.0890
I :5.1980
I :3.5000
91:11.4401
91:7.7149
VI:13,728.1624
VI:18,515.8260
�-
VR:2,088.8000
VR:4,176.0000
i
'
D :11,648.1624
D :14,339.8268
(
m
�J
U
RPARSONS &
ASSOCIATES
CONSULTING ENGINEERS
Fi. Collins. Colorado 80524
CLIENT
PROJECT
MADE BY
JOB NO.
CALCULATIONS
DATE CHECKED BY DATE SHEET OF
81+LBL •DET• 32 PRA _ 63 STG.. � t j
.,,
82 •A ?• __ 33 ADY 65 ARCL 00
03 PROMPT 34+LBL 01
84 STO 83 araLOa 5 5CL 00 j 66 PRA
3
A5 'C ?' 67 'I
86 PROMPT 37 68 ARCL IND 88
87 ENTERt _ 38 18. n 69 PRA
88 1.25 N 39 + a . 78 001:•
` 48 STO 88 71 ARCL.04 I�
18 STO 69 ( 2S) < 41 RCL IND 08 72 PRA
ii "OR ?• a ! 42-RCL-073 'YI:•
43 * _ 74 ARCL 81
12 PROMPT 44 RCL 03 75 PRA
13 STO 02 Qr41 a 76 'VR:'
14 •0 ADD ?• 45 * 77 ARCL 07 2
15 PROMPT 2 46 RCL 18
-- 78 PRA
,--- �
16 STO 10 Q.d 1 47 + Q-
17 8 48 STO 04�[�_ 79 OD
88 ARCL 86
18 STO 85 49 RCL
19 5 �- 58 60 81 PRA
20 STO 00 51 * 82 ADY
21 AREA: a 52 * 83+LBL 0�
53 _STO 81
_u I 84 RCL 06
22 ARCL 03 54 RCL 82 1�- 85 RCL 05 0
23 PRA f. 24 •C: a
j _.i 56 111 BET" Li
GTO Bb X>Y?
00 -+. '
25 ARCL 89 57 68 88 RCL 06
26 PRA Z * 89 STO 05
27 •e ADD: 58 -
28 ARCL 10 - 59 STO 87 Yr41 _;. 90 5 Ali
29 PRA 60 RCL 01 ; 91 ST+ 80
' 61 RCL 87
92 GTO 01
38 'Q REL: - -� 93
62 END.
31 ARCL 02 1
R11=
8.0080
R23-
2.4380
R35=
1.3800
R12=
7.2000
R24=
2.3000
R36=
1.3208
..,
R13=
6.8000
R25=
2.1709
R37=
1.2808
C
R14=
5.1900
R26=
2.0680
R38=
1.2400
I N `-"-
R15=
4.5808
R27=
1.9588
R39=
1.2100
R16=
4.1700
R28=
1.8708
R40=
1.1800
R17=
3.7908
R29=
1.7800
R41=
1.1588
RIB=
3.5008
R38=
1.7000
R42=
1.1208
R19=
3.2388
R31=
1.6288
943=
1.1180
R28=
3.8008
R32=
1.5708
R44=
1.6980
R21=
2.7988
R33=
1.5000
R45=
1.880P
R22=
2.6008
R34=
1_4380
PARSONS &
Ir-1- ASSOCIATES
CONSULTING ENGINEERS
Ft. Collins. Colorado 80524
WENT
PROJECT
MADE BY
JOB
CALCULATIONS FOR
DATE CHECKED BY DATE SHEET)C�� OF
9.
FORMULAE
Time of Concentration:
1.87(1.1 - Ccf)6'5
Where:
C =
Runoff Coefficient
T =
c S.33
0 =
Distance in feet
S =
Slope inpercent
cf =
Antecedent precipitation factor
1.0 for 2-year and 10-year
1.2.5 for 100-year
Velocity and Capacity:.
V 1'n87 X R'67 X so
Where:
n=.Manning's
roughness coefficient
A ,=
Cross -sectional area in square feet
Q =.1.486 X A X R'67 X S'5
R=
Hydraulic radius
n
S =
Slope in feet per foot
Runoff Quantities:
Q = CIAcf
Where:.
C =.Runoff
Coefficient .
I =
Rainfall intensity, inches -per hour
A =
Area in acres
cf =
Antecedent precipitation factor
1.0 for 2-year and 10-year
1:25 for 100-year
Runoff Volume:
V = Q X Tc X 60
Where:
Q =
Runoff in cubic feet per .second
Tc =
Time of..concentration
Orifice Plater
Q = 0.65A q
Where:
A =Cross-section
area in square feet
g =
Acceleration due to .gravity,
32 feet/sec.2
h =
Height of water above center
of opening
Detention: Volume is computed by
means of
a program', using the Modified
Rational Method which
varies the
rate of flow in, while dis-
charging at a constant rate.
60
55
50
�s-
0.00 I.00
No. Revision
0eo0 1,00
0400 h00
2.00
3.00
prefect:
By Dare-
PARSONS &
ASSOCIATES
85.07 RNT
rf;n
492 LLase Plaza
Sea1s, ,d,
—
FL Collins,s, Colorado 80524
Designer: a.
Chocked By: J.A.W.
CONSULTING ENGINEERS
(303)221-2400 %Z
i'
Prepared: um05
4100 5,00 6,00
RAINTREE COMMERCIAL P.U.D. PHASE II
DRAINAGE & GRADING PLAN