HomeMy WebLinkAboutDrainage Reports - 03/04/1987STORM DRAINAGE REPORT
FAIRBROOKE THIRD FILING
CITY OF FORT COLLINS9 LARIMER COUNTYs COLORADO
McRAE & SHORT, INC.
1231- 8th Avenue
Greeley, Colorado 80631
Telephone (303) 356-3101
FINAL
STORM DRAINAGE REPORT
FAIRBROOKE THIRD FILING
CITY OF FORT'COLLINS, LARIMER COUNTY, COLORADO
PREPARED FOR:
MR. JACK COCHRAN, WHEELER REALTY CO.
1331 - 8th AVENUE
GREELEY, CO. 80631
PH: 356-1331
u
PREPARED BY:
McRAE & SHORT, INC.
1231 - 8th AVENUE
GREELEY, CO. 80631
PH: 356-3101
REPORT INCLUDES:
ORIGINAL REPORT ..........4
CALCULATION SHEETS ..........14
DRAINAGE MAP ..........1
ADDENDUM # 1(4.-30-87) ..........3
PROJECT N0. 105-'852
MARCH 4, 1987
McRAE & SHORT, INC.
1231-8th Avenue
Greeley, Colorado 80631
Telephone (303) 356-3101
Engineering, Surveying, Planning & Land Development
t
Mr, Jack Cochran
' Wheeler Realty Company
1331 - 8th Avenue
Greeley, Colorado 80631
RE: FINAL STORM DRAINAGE REPORT
FAIRBROOKE THIRD FILING
CITY OF FORTICOLLINS, LARIMER COUNTY, COLORADO
March 4, 1987
PROJECT NO. 105-862
INTRODUCTION:
The purpose of this study is to determine the quantity of stormwater runoff
generated from the development of Fairbrooke Third Filing and the manner by
which the runoff will be accommodated.
The proposed development along with the required drainage improvements are
analyzed in accordance with the guidelines established by the City of Fort
Collins Storm,Drainage Criteria Manual with calculations enclosed.
GENERAL:
This area is included in portions of the following drainage basin reports:
Fairbrooke S.I.D. Drainage Report, the Brown Farm Preliminary Master Drainage
Plan prepared by R.V. Lord and Associates, Inc., August, 1971 and Volume II
"Preliminary Design Report - Division of Storm Water Runoff Through Irrigation
Canals from Multerry Street to Spring Creek - Fort Collins, Colorado", pre-
pared by Resource Consultants, Inc., July, 1980.
' SITE DESCRIPTION:
The site is located in the North Half of Section 219 Township 7 North, Range
' 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer,
State of Colorado, The Fairbrooke Third Filing project consists of 9.717 Acres,
more or less, and is bound on the East by Hampshire Road, on the North by
tBauder Elementevy School.,on the South by Cedarwood Drive and Fairbrooke First
Filing, and on the West by undeveloped Tract D of Fairbrooke S.I.D..
1
Mr. Jack Cochran March 4, 1987
PROJECT NO. 105-862
FI14AL STORM DRAINAGE REPORT
FAIRBROOKE THIRD FILING
CITY OF FORT COLLINS, LARIMER COUNTY, COLORADO
SITE DESCRIPTION: (CONTINUED)
' The site is presently undeveloped and lying fallow with a small amount of short
pasture grass. The existing drainage pattern is to the Southeast at slopes
' ranging frcm 4.5% on the upper end to 1.5% on the lower end.
' PROPOSED LAND USE:
The project is planned to consist of forty-two (42) single family dwellings with
the average lot size of 8190 square feet.
' HYDRAULIC ANALYSIS:
' The Rational Method has been utilized to generate stormwater runoff flows for
the 2-Year and 100-Year developed return period storms for Fatrbrooke Third
' Filing. The Drainaqe Map defines the basin boundaries and the design points.
The historic flow from the site was not calculated as this was reviewed in the
' earlier reports and used to size the community detention pond. It has no
effect on the developed flow in the streets.
1
2
' Mr. Jack Cochran rch 4, 1987
PROJECT NO. 105-862
' FINAL STORM DRAINAGE REPORT
FAIRBROOKE THIRD FILI14G
CITY OF FORT COLLINS, LARIMER COUNTY, COLORADO
' DRAINAGE PLAN:
' The developed tract has been divided into seven (7) areas. Composite runoff
coefficients and time of concentration calculated for each area to points of
' concentraticn. Combined area runoffs have also been calculated to analyze
the street flow at these points.
' A small area of offsite drainage is shown on the S.I.D. Drainage Map. Flows
from this area can be accommodated through the overlot and street drainage plan
' proposed.
' The final drainage patterns are similar to the drainage basins shown on the
Fairbrooke S.I.D. report with the Northerly area draining Easterly to Hampshire
Road. From this point, the street flow is North to the low point inlets and
' drainage swale which runs East to the community detention pond. The Southerly
area drains South to Cedarwood Drive and thence East to Hampshire Road. From
' this point, Hampshire Raod drains South to the existing large drainage channel
along the Scuth side of the Fairbrooke area, and thence to the community deten-
tion pond. .The drainage to both Cedarwood and Hampshire Road is primarily from
the upper side as the developed areas to the South and East drain away from
' these streets. This will provide additional street capacity when the streets
are overtoped.
Cedarwood Drive and Hampshire Road and the storm drainage inlets, pipes and
channels between this subdivision and the detention pond were part of the storm
drainage plan for the S.I.D. and are all in place.
The plan for the overlot drainage is to run drainage swales along the North to
South property lines and not to create any back yard drainage swales. Quantities
of storm water are kept at a minimum with this plan and there is adequate grade
' to prcvide swales and flow between the houses.
3
Mr. Jack Cochran March 4, 1987
PROJECT NO. 105-862
FINAL STORM DRAINAGE REPORT
FAIRBROOKE THIRD FILING
CITY OF FORT COLLINS, LARIMER COUNTY, COLORADO.
DETENTION:
The regional detention pond for the Fairbrooke S.I.D. was designed by the City
of Fort Collins Storm Drainage Division, and is not a part of this report.
Detention capacity for this project is provided in the .Community Pond.
McRae & Short, Inc. !�
Gerald B. McRae, Professional Engineer and
Land Surveyor, Colorado Reg. No. 6616
Enclosures: Drainage Map...............1
Calculation Sheets ......... 14
4
MCRAE & SHORT, INC. CLIENT rVf/r'r1/E
Greeley, Colorado —.13ROJECT�_%'04—z"
Engineering, Surveying MADE 8 OW94f DATE
r7l,
AFA54 1:
oalf 0 . epas
10004
gy ad
A.r
om
40
Coot
all 1 4F.
ST. .
i�ctwits
/ 7ZZ
07
j
Ove n� 7E*.z1, 7�rlfll-a
� oo ! i ��j t17 }I
7c—.,
_PROJECT NO.4'5:
.Zz' — ep-%
DBY—DATE—SHEET OF 14
" mil t1vr-AL& XA1 r�AI!5 i �/
• Tug/0 C ce
z 0, o5' rA37 s
MCRAE & SHORT, INC. CLIENT •v"��IT-/
Greeley, Colorado _PROJECTL'C
Engineering, Surveying MADE B� DATE !
PROJECT NO. UC��
r' -- ZrAiis'n4�
NECKED BY -DATE -SHEET Z OFbf
• 06",pos i ro-e (21 !
c?, (a te) Arboii
C'z
1�,45
3b0;0 Q, 50
K 0.90
,44 0
�CPcvHs� - i
9!z90' O;50
x D.�v =
�'/o
rota
730
/'✓c re
j z'S' _' C"iou =
o; 69
• 7Ai1e OF 61vOfNT,e/1T1t�Ni;
Ore r�
T2 /. �7 �/1 /f4��0.�20,,� ! �0 ►�y
' Tc� _ � ? 3 ,
ruin.
2�0113
A9
min,
19
TO�ft I ►L' Z mr / �, Z kwj 'c jUtl V' (!5 #if I
P,AINF/JL1_ 17Nr4Ats/T je S
:70
Q,v - 0,°G9� /, Z5 �o G;4, i 2 bo
U '
• j i l� j l j l j l l
•'� j j I I j I j j
• j I i� i I I I I�
MCRAE & SHORT, INC.
Greeley, Colorado
Engineering, Surveying
CLIENT PROJECT NO. /��
-PROJECT
MADEB��f DATE 014 /CHECKED BY -DATE -SHEET 3 OF
M91
Arbon
Cz
000 141.1
Y; 0. 95-
4 /Z
jvofy s7 64
ae-()
rota l = I
46/00
/p
,Cry'?
Ore r /0 ti -'C, i?7 Z)
k,(�o 7�/ lt� /0 ei 4,
67 F 0,
rci 14,
14
Vi3ly5l
d1o'lafel Atleno 46 rd
To 7c-, cr /9, 7c"/, 8
'2A i A4 r1i Li, XoV r4A1517-V
189
pz 4 14 oa x Zo 3811
MCRAE & SHORT, INC.
Greeley, Colorado
Engineering, Surveying
CLIENT
-PROJECT
MADE 9�� DATE
_PROJECT NO.
BY —DATE —SHE ET--44--OF L4
6,10 #1 / AtIc &j /. 5�
A 0 rc lev
i Ai rA i-t- .IN nAt!5, 7-v
c 2. 41")
A
Ot 60 /j 00 xz.j4s fe Oo68 -r
MCRAE & SHORT, IN . C.. CLIENT Wheeler
Greeley, Colorado -PROJECT
Engineering, Surveying MADE BF_DATE !�/41
00
:7-ota 199; 7
ig. /)c Ire;,
• 7_m4e Or 6&1e0c-,VrR4- T/O/V,
Ore
Ira 7
1A
Y3;
/ At'cev
440 #/
Wo Irou I 7F, e-- 24o
-PROJECT NO.
BY_DATE _SHEET __� OF
7c',,, V == 'Z 2, 9 tu � H -
BA i Al r-,4 L& XA/ n�Ats 17--/
l :.Z7 44 go
v
/4 Zli 7,4( cs
)e
01471e 46 cks
McRAE & SHORT, INC.
Greeley, Colorado
Engineering, Surveying
PROJECT NO. IV� ��re
�-' -- Zrw /;to-% 6
ED BY_OATE_SHEET_j9Z_OF 14
47
—7
ne
Arbon, (2z
Aj 06 Y
!P'Oof
0, 57
O.0. 0 9
Iota 60 060
II
I t
I xr- rEs
Or 6&1etc-'VrRi 4 r/ Al,
0.7 Z)
Orr e rczil'�711"i
Ohdo);I
)`,4, Zoy
0
Y3!
/t (36,4-c,
23o Fi// e. 7 ;'
7 L IV
7c V
'2A t A/ r-,4 L4- XAt rtAts 17-1-/ 0,
_TZ
Qp,
00 60 V h 00 7- :?j 0i 7/ e4s
G�r s
CLIENT
—PROJECT #!55?1A
MADE. - I _r
McRAE & SHORT, INC. CLIENT r
Greeley, Colorado --PROJECT_ �F-Ap
Engineering, Surveying MADE 11'19—n�lf DATE dglA
PROJECT NO.
'A'e—�r�r��rnye
ECKED BY DATE—SHEET�OF ZI
re 6?
Arbon Cz
:Roof: i j 1
9.
e O. 06
le- i I -&oo'
0,10
io
1c tvlf S71
15*
o1yd = !
; ! �z :
0 38
0100
o,47
.} i j; i� I � I i
� i I
,
• 77-1w7� Or 6&leoc-A17T�W- TIDAlll
Ore
Ohd noeli 7�1
7co 2 6 7 2 o
f
40 to I
of z Y
I X &
Y31
117jl
OA,Iltlfcl lCleno 40% t
io/cc 7c-z cv Zl-lstff" iov 00,
2A It m rA Lt- Zv r�At5 t 7-q
4.Z710v
2-7
6t47
0
C:)
LL-
C:)
1—
d
J
U
_J
Q
U
W
1,
G
Z
Q
0
I
`q
w
P
31,
w
MCRAE & SHORT, INC. CLIENT.
Greeley, Colorado
PROJECT
Engineering, Surveying MADE B
PROJECT NO.1
�,fl�i�.G.0 ALL �/t'?/�fc%�'•e DATE CHECKED BY DATE ��//jj SHEET OFF
_o
d
a
J
�
3
pnV
o
z
�
IDA
N
4
v p
O
a)
\
t
11
�a
a
wx
o ci\
p
ti
Cci
(�j
C}
l�►
n►
FA
to
6\
d
1V
N
tV
N
�►
�,
—
(v
�
�
N
n
�ri
M
N
pUj
N
N
�jr
0
11
W
In
r
s
kn
4
M
y
Ilj
N
a
N
d
n
•
1
m
d
N
N
l�n
a
N
W
—
+
�'
M
yam•,
o
z
H
z
i
9
C:)
z
0
a
J
U
J
Q
U
w
1,
a
z
d
CC
O
McRAE & SHORT, INC. CLIENT.
Greeley, Colorado
PROJECT
Engineering, Surveying MADE e
• i -� PROJECT NO. 1G0
TE 4C CHECKED 9Y DATE SHEET 9 OF
/417
Q7
O
C
04
,1
11
N
O
41
N
),
oCD
0
0
O
O
O
CQ
O
G►
oo
G1
m
�9
a0
0
h
h
D
M
LJ-
J
�V��
v
4
11
4w,
. `
11
V
Q�
:::���111
P_
, `
CA
U
Q
O
�
O
0
�
O
�
O
O
11
CIO
rt
N
N
O
�
1
r
Tj
7
O
z
�
H
z
g
�
M
v
aN3
n
2.0
1 EGu•nowl 0 • o.eG(A)
10000 n If RouaHNnf eotrnCIENT IN MANNING Ip
9000 TONruLA Arr•Or•u r[ ro MATERIAL IN
6000 DGTtam er ENA NNtL
7000 1 It RECIPROCAL or CROSS SLOPE .09 1.0
1 6000 Rcrt•ENCt. H 4.1 PROCEEDINGS n.G, .07
5000 no[ ue, tawno« u'1 06 .60
.70
4000 EXAMPLE flit DA1Nto LINES
1 100 IL 03 .60
3000 o vtwl 1 • o.of To
n • of) t/n • Itoo � So .04 .50
2000 f 0.11 0 SO W U-
-20
FIND, e • E.e CIS .O3 .40
Io Z
_- 1 l000 ____ Z -.30
_
soo :__ .02 �
^ v
700 _
CY - -
600 i e (n .20
1 S00 'C ,
Q 400 ~ ! 2
INSTRUCTIONS C7 I ,OI Q
1 a 300 .0T W a.
N 1. CONNECT !/n RATIO WITH SLOP! 191 Q :.as x
{i AND CONNECT OILCN•ROt 101 W.I. = 03 x .pp6
200 DEPTH 1>I. THESE TWO LINES MUTT OY Q .007 N ,10
INTERSECT AT TURNING LINE 'OR y/ 1 W COMPLETE Sow/ION. U .006
tL .06
UPON SHALLOW � _ T _ � .005 UJI
VJ .07
100 V-1.APtD CHANNEL
90 AS SHOWN USE NOMOGRAPH Q
1 60 WpN 1 . i .004 .06
W 70 Cr
60 a Q .05
50 S. TO DETERMINE -�-G rj 1 .003 comfcN.RGE e, IN T. E ° N Cr .04
40 PORTION Or L.AMNLI L _ (T)
N•VING WIOTN 1:
30 DETERMINE DEPTH T 100 TOTAL DISCHARGE IN .002
1 ENTIRE SECTION 0. THEN use NOMOGRAPH to t... .03
DETERMINE 0, IN SECTION D 10. DEPTH Q
20 j•.r•(�)
4. TO DETERMINE 01l CHANGE 1 ' ^ .02
IN COWPOfITt Stc TIONa- T e ' LL
■ W
FOLLOW INSTRUCTION S I 1 .001 C3
10 TO OBTAIN DISCHARGE IM J-1-_1-. [,j• ,
SECTION G AT ASSUMED t,TJ-il
1 G,P,H T 1 OSTAIM 0, TOM
From BPR SLOPE RAT,* 1, AND at,?" >'
Figure 4-1 01
NONOGRAPH FOR FLOW IN TRIANGULAR GUTTERS
(From U.S. Dept. of Commerce, Bur u of Public Roads, 1965
/, 3 )*lrbroo- C o Cede '-wood Drive
Flo; tp48
t c /0�d a ��cl,c� �u�ler) - 4 O r- G d� Or¢D
TOW = 434"r0, r10eO�tL �aert f�Gv !%I S
1 S= 410 � A c /uaI Csx► a f5 2. (3 c-f s
1 MAY 1984 4-3 DESIGN CRITERIA
d 6fac-
10000
9000
8000
7000
6000
5000
4000
3000
Us
♦` 700
Soo
500
Q 400
Q300
200
100
90
80
70
60
S
40
30
20
R
From BPR
2.0
n IS ROUGHNESS COEFFICIENT IN MANNING
10
,
FORMULA APPROPRIATE TO MATERIAL IN
SOTTO■ Of CHANNEL
•
1.0
E It RECIPROCAL OF CROSS SLOPE
.08
REFERENCE H R. B. PROCEEDIROS I946,
.07
PACE ISO, EOUATION 1141
.06
.80
f-
.70
EXAMPLE Jett DASHED LIMUI
LL
05
,DO
.60
GIVEN. t • 0.03 t0
c/n • ,too ILLDo
�,.:
.04
.50
n • eEJ
V 30
ILL
r • eta
-to
FIND, a • E.0 OF _--
.O3
.40
�__----- Io
Z
z
-.30
-- t_
.02
T
a
(n
v
.20
W t
INSTRUCTIONS (7 .1
J
O
0: .0?
w
.01
CL
I. CONNECT E/n RATIO WITH SLOPE ICI Q .00
1.03
Z
AND CONNECT DISCHARGE 101 WITH
Z
.008
Iz
DEPTH Ill. THFSE TWO LINES MUST
Ot
Q
.007
IU)
10
�U
INTERSECT AT TURNING LINE FOR V A
iT
w
COMPLETE SOLUTION. 0 .01
0
.006
nW'
.oe
1.7011 SHALLOW I T.005
t
W
.07
V-SHAPED CHANNEL
0
0
AS SHOWN USE NOMOORAPH
.06
WOH E • Y
.004
cr
d
O
.05
e. TO DETERMINE W f '
0
.003
DISCHARGE 0, IN ; ...-
inCr
.04
PORTION OF CHANNEL
HAVING WIDTH R:
DETERMINE DEPTH ! ran TOTAL DISCHARGE IN
.002
,03
ENTIRE SECTION R. THEN USE NOMOGRAPH TO
DETERMINEO6 IN SECTION N FOR DEPTH
Q
R TO DETERMINE DISCHARGf I '
G ■■
IN COMPOSITE 1EETION!- tq
S
^
LL
Uj
.02
FOLLOW IMSTRVCIION
I�
•001
TO OBi11N OIBEHARG[ IN -1R�_ t,)
SECTION a At ASSUMED • 8•I1-J1
DEPTH ) I OBTAIN 0, FOR
SLOPE RATIO EA AND DEPTH )• THEM 0, • Q. • OS
2 *;Iq2 Figure 4-1 L •01
NONOGRAPH FOR FLOW IN TRIANGULAR GUTTERS
(From U.S. Dept. of Commerce, Bureau of Public Roads, 1965)
%�ourf Cofi�rirrJlm<u�fl'r�s/irt %in</,
e _ A01 /, Arm., Af /
Lr�y ° L�348 ;?4c/ 1rF77tr) = bP 0 GTS
L. /u Ct = /may%a M /2edEE�k r►� hzG/l '� O �
' r/o row 4S e, � �t.�ctR/ �/eactly = 4 O Cis
' MAY 1984 4-3 DESIGN CRITERIA
`z 114
10000
9000
8000
7000
$000
5000
4000
3000
2000
1000
900
e0
00
�
600 LD
z
500
o
400 ~
300
NQ
GL
200
100
90
60
70
60
50
40
30
20
to
/00 YCA1E From BPR
7)Es/67,4/ A/.o(Al Figure 4-1 1- .OI
MONOGRAPH FOR FLOW IN TRIANGULAR GUTTERS
(From U.S. Dept. of Commerce, Bur u of Public Roads, 1965) / I
r1= OP /L �O/NT � Fcc it, hreoke Cf. 'C[�N<I rWoUd Dr�vG
M = e48 r
er c 271 O cog Cc d er
GE �o At c /�/g" Q (aGl1 �u fi
�£ /0 70u1 _ 454' " 0,40lJ,�
MAY 1984 4-3 DESIGN CRITERIA
2.0
to
r =-
EQUATION- 0. G.0 (A)
n IS ROUGHNESS COEFFICIENT IN MANNING
10
FORMULA APPROPRIATE TO MATERIAL IN
GOTTOM of CHANNEL
1.0
t IS RECIPROCAL Of CROSS SLOPE
.08
RETEPENCE; N. R.E PROCEEDINGS If PA,
07
PAGE ISO. tOUAT-ON 1141
.08
,B0
EXAMPLE Efu DAEWOO LINES-
.05
100
.60
OIV[NI 1 • 0.03
r%%
TO
1 . to
50
.04
a . Ott
U
LL
ILL.YO
Flxe- 0 111.0 ert
—
,40
_
---
to
Z
Z ' Z .30
----_ _—_ .02
p _
5 N .20
t
Z
INSTRUCTIONS
.OT
w
a
1. CONNECT $In RATIO WITH SLOPE ISI
Q
.05
Z
AND CONNECT DISCHARGE 101 NIT.
=
03
Z
.008
DEPTH IS). THt St TMO LINtS -.11
02
Nq
.007
N
INTERSECT AT TURNINO LINE 104
N
w
.10
COMPLETE SOLUTION,
Q
.01
"
V.
.006
06
T
I
w
1.104
_
IILLw
.005
-
V•fNAP[D CHANNEL
41.ED
a
O
O
07
,
AS SHOWN USE NOMOGRAPH
.004
.06
WLTH t �
W
Cr
a
.05
0
R
f TO DETERMINE
ri
.003
m
D-SCHA RO[ 0, IN �:
0
N
Cr
.04
POPTION OF CHANNEL I✓ - __ S (1)
M AVING WIDTH ■: 1-1—
U
Ot Tf NMINE OEPTM Y FOR TOTAL DISCHARGE IN
.002
(NTIN( SECTION 0. THEN USE NOMOGRAPH TO
.03
Dt T(RYIN( 0. IN SECTION 0 SON DEPTH
Q
a'a 4)
_
t a
4. To 011tRMIME OtSCHAROE
N
.02
IN cerrofrtE f[ChON IF
w
FOLLOW IMSIRUCI-ON S ( t f
'ppl
To ONIAIM DISCHARGE IN --11
S[t TOO" R AT ASSUMt0 tr la•a'1
oEPTN a i OETAIN 0 FOR
'
SLOP( RATIO EA AND DEPTH i IHtN 0,• 0. . 0.
13114
2.0
r
A
[OUAt10N: 0 • 0. 9 a ti
1
IOOOO
rl is Rousm MOUONMr!f EOC[rIE1CMT IN WARNING
IO
9000
FORMULA APPROPRIATE TO MATERIAL IN
6000
BOTTOM or CHANNEL
L0
7000
E If RECIPROCAL OF CROSS SLOPE
.09
6000
R[JUENC[: H. a. ! PROCaeINa% .9.4•
.07
1
5000
PAGE ISO, tGUA110N 1141
.60
06
4000
70
EXAMPLE Ifu oAfw[e uwol
.05
1
3000
GIvtNI ! • 0.09
00
70
\
0
E • 14 1 N
t/n • reoo �
To•
e0
L-;
r
.04
.50
.Of
V
�0
2000
J • 01E
[O
ILL
r=wwe=0e.e c=f
_
.03
,40
1
-----
io
Z
_
2
-.30
1000—___
—
.-.
1
900
_
T
700 -
_02_
_--_
r"
600 =
'"'
e
N
.20
1
500 a
B
O
400
INSTRUCTIONS
.01
Q
300
.0
W
d
1
I. CORRECT f/" RATIO WIiN %LGlo[ 191 Q
.05
AND CONNECT OtSCNANat 101 WITH =
O7
Z
.006
200
DEPTH IJI. THESE TWO LINES MUST
.0[
Q
.007
,cn
N
10
�0%
�/
INTERSECT AT TURNING LINE 'On VI
CL
1
COMPLETE SOLUTION. 8
.01
I1
V
.006
C'
.oe
I.FOR SHALLOW -_ T J
.005
W
100
V-SHAPEO CRANNIL
O
Q
,07
90
AS SNOW" USE NOMOGRAPH
1
6o
70
WL,N e • y
WCr
.004
.06
s0
n.
.05
SO
] TO DETERMINE r a
O
.003
DISCNA RO[ 0, IN Y. ,
t
N
.04
1
40
IJ•,
location Or CHANNEL —!7I
HAVING WIDTH t:
30
OtItAMINE DEPTH J PON TOTAL DISCHARGE IN
,002
O3
ENTIRE SECTION 0. THEM USE NOMOGRAPH TO
L•
rQ
1
DCfCRMIN[ 0. IN SECTION O FOR OCRTN
20
a'•a-M
_
rJ
1_
4TO OCt[RYIM[ OtSCNARO[
In COMPOSITE fte"ON
1�
,02
Ld
FOLLOW INSINUe"O" S
C3
'
10
10 OBfAHI GIf CHARet IN
.001
%[Clio+ W AT AlluY[O
DEPTH a % OBTAIN 0 FOR
1
From BPR
SLOPE RATIO It AND OtPl- Y' I-t" 0, • 0. • 0,
/Oo YEAS `.01
1 Figure 4-1
��<<N G�W NONOGRAPH FOR FLOW IN TRIANGULAR GUTTERS
(From U.S. Dept. of Commerce, Qureau of Public Roads, 1965)
h : O• /L 7j/MrCOT/GM 1tl meter f @ �a��stiirr �oa.e:/.
1 ?_ /D• / 8IFIAAi-Fa s 3 f 4
1 L//'' to
/14o T4we4f �6� ' lc�doorpri Fire./��_ ,� 0.8
1 MAY 19114 4-3 DESIGN CRITERIA
No Text
0
McRAE & SHORT, INC.
1231-8th Avenue
Greeley, Colorado 80631
Telephone (303) 356.3101
Engineering, Surveying, Planning & Land Development
FAIRBROOKE THIRD FILING.- STORM DRAINAGE
ADDENDUM #1
April 30, 1987
PROJECT 140. 105-852
The drainage basins on the proposed development correspond fairly well with the
original Drainage Basin Report. Approximately 1.0 Acre of Basin F-9 has been
brought to Cedarwood Drive. This was due mainly to the economics. and place-
ment of Valley Pans at Fairbrooke Court and Coventry Court. The size of the
parcel is minimum (about 4%) in the total basin contributing to the flow in
Cedarwood Drive.
I also note that the S.I.D. Drainage Report used a composite "C" factor of 0.50
for residential areas. Due to the larger lots and layout, the calculated "C"
for the area under consideration is 0.38. This is a 24% reduction in the flows
originally anticipated.
The street flows in Cedarwood Drive and Hampshire Road were analyzed in the
' original S.I.D. Drainage Report. Certain Inlets and Drainage pipes were
installed to handle the street flows. As we are contributing less than was
originally calculated to flow in these streets, we have not re -analyzed the flow
quantities or depths.
' We have completed the final contours in the subdivision streets. The attached
calculation sheets also show the depths of flow in each flowline (and at crown)
' for Coventry Court due to the offset crown section.
' All flow from this portion of Fairbrooke-flows Easterly to the Fairbrooke De-
tention Pond (Regional Type) at the Southwest Corner of Prospect and Taft Hill
Road.
If you have questions, please call.
71
' Gerald B. McRae, P.E. & L.S.
McRAE & SHORT, INC.
Greeley, Colorado
Engineering, Surveying, Planning &
___ . _.- __-________ _ 7�4 a I_.-_._. _.
°Z.
N
N nit3
J
N
3
PAGE
-- ' ----- 11 �v`3b
tip
O M rj
Qj
VIE0
OF PROD. NO. SUS 0
2�3
2.0
' IJ
r = '
EOUATION: O • O.SS M 94 a*''
10000
n IS ROUGHNESS COEFFICIENT IN MANNING
10
9000
FORMULA APPROPRIATE TO MATERIAL IN
6000
BOTTOM OF CHAN"
O6
1.O
7000
1 IS RECIPROCAL OF CROSS SLOPE
6000
REFERENCE H. A. B. PROCEEDINGS 1/44,
07
SOOO
PAGE ISO, EOUATION 1141
.60
06
4000
(—
.70
EXAMPLE 1lEc DASHED LINES)
05
wo
60
3000
o1vcNl S. • o.o!
To
• INGO �
n •
Bo
.04
.50
.021/n
0
-
3O/ VLL
2000
a • o.I:
0
n11oI o • 2.0 eFB
03
40
10
Z
1000
_
-.30
_
/
.02
Boo
700600
W
fiJ = (2yo a N 20
5 10 �G �.�1, SI J E 5 .3 ...
Q 400 z
~ � ltJ 2
_
�� T k! TIONB (' J .01 Q
Q 00 s•- oT w Q.
NNCET 1/n RATIO WITH !LOPE 191 Q 03 Z .
AND CONNECT DISCHARGE 101 WITH = o3 � .006
ZOO DEPTH IY1. THESE TWO LINE! MUST �(n 0 y0T AQ .007 •�/�
INTERSECT AT TURNING LINE FOR � ..10
COMPLETE SOLUTION. Q .01 •\ .006 W
n' .0 e
I. FOR !HALLOW = T a _ LL .005 w 07
IOC V-SHAPED CHANNEL Q Q
90 AS SHOWN USE NOMOGRAPH
60 WLTH 1 ' 'y w .004 .06
60 a. Q .05
50 ! To DETERMINc T- a ri .003 m
DISCHARGE a IN y N Cr..04
4O PORTION OF CHANNEL
HAVING WIDTH I: I~—E— U
30 DETERMINE DEPTH a FOR TOTAL DISCHARGE IN .002
ENTIRE SECTION e. THEN USE NOMOGRAPH 10 I` .O3
2O DETERMINE OA IN SECTION a FOR DEPTH EQ
Y. '
i
4. TO DETERMINE DISCHARGE `a .02
T e
IM COMPOSITE SECTION �- ; e a
FOLLOW INItRUCTION S. ' 4.
10 — .001
TO OBTAIN DISCHAROC IN'�_R_• 1Pi
SECTION a AT ASSUMED
DEPTH al OBTAIN 0. FOR
From BPR !LOPE RATIO to AND DEPTH a' THEN 0,', 0, 406
Figure 4-1 01
NONOGRAPH FOR FLOW IN TRIANGULAR GUTTERS 3�3
(From U.S. Dept. of Commerce, Bureau of Public Roads, 1965) /oS-852
WIN
MG (mi
a2t.6.)
gNN(Cf')
1
1.37
1. IN
S.N
2
0.61
0.61
r 2
LOT
I.tl
6.M
.N
0.61
0.71
2.69
♦26
2.21
LAC
2.66
5
2. i5
I."
A."
• 5 � 5
6.50
1.21
2
2.0
2.M
6.47
1 .2r 51 6 11
6.6
CAN
12.64
5
2.30
2.30
9.11
.60
LED
6.4
3r6
3.0
2.6S
10.26
IV INTO
if
A --
(ROSS MCA . 9 717 6R5
LPPi51,E LION DAVIS) • C."
NET AND - 7896
CONSTITUTE CIA, DET) , 0.38
MITE INTENTION • 141E
WINME WI4: TRI4RWA[ $.1.0.
MY IS 4 READ W55 MO 4EF IF FREES
NO S S.
SITE IS 14T IN 101-1EM ROAVUIR.
CAVA
//_ �. Ta✓' _MlW' LOCK 2 I
.Og� \ 2 Sf G6 ar ` , 6i^ _ ` 9• q - �. M1 I
Po lYaas
IT \ s.e�« � &rcil \/1 \ E nlff 11 _ TARE11"'e AP
-
/
$ tUN62Nil
MANY
a6✓
--' _-I
FAIRBRDD�BBD/✓/S/ AlF/RSi X
f Y
I r
/ I I S
�aa4rJ�X-�u�.
MCRAE B BHORTR INC.
1201 SIR AVENUE GREELEY, COLORADO 00E31
Ta1pM1p 1 3
50
-2101
FAlRBR00KE SUBDIVIVON TH/ROF/L/NO
roar ca2LVJ, COLO
ORA/NAGS' PLAN
BCAIE sw. u•
6 6/9/B) 6
S JO P110JECT a �
&MAIN