HomeMy WebLinkAboutDrainage Reports - 01/20/1984P(-xo', I) za i 0
DRAINAGE STUDY
PORTNER ESTATES SOUTH DEVELOPMENT
PHASE I
TRILBY ROAD AND LEMAY AVENUE
CITY OF FORT COLLINS
Reulknar-Hallogg
8 Aiioc., Inc.
CONSULTING ENGINEERS
111 i
DRAINAGE STUDY
PORTNER.;ESTATES SOUTH DEVELOPMENT. -.-
PHASE I u
'-TRILBY ROAD AND LEMAY AVENUE
CITY OF FORT COLLINS
` December 5, 1.983
Revised January 9 1984
.
.
.
FKA PROJECT NO. 025-83
PREPARED FOR:
MSP INVESTMENT CO_-,
'
650 South Cherry Street '•{.
•
Suite 1050
Denver, CO 80222
(303) 399-9804
PREPARED BY:
FAULKNER-KELLOGG & ASSOC., INC.
'
7190 West 14th Avenue
Lakewood, CO 80215
(303) 232-8076 '
t -
TABLE OF_CONTENTS
Introduction
Purpose and Scope
Figure 1
Historical Data
Site Study
Method of Analysis
Discussion
Conclusion
a
Appendix
Page
1
1
2
3
3
4
6
9
' INTRODUCTION
' This report has been prepared for MSP Investment Co. as a final
1 _
drainage report in conjunction with the proposed medium density
residential pre -manufactured housing development of Portner
Estates South Planned Unit Development, Phase I. Included in
' this drainage report are all pertinent data, methods, assump-:.
tions, and calculations used in the analysis, and design details
' for the storm drainage system of the proposed development.
' The development is located on a 11.56 acre site`on Tribly Road
' east ofU__.S. Highway 287 in southeast Fort Collins, Lariiner
County-
The site is located in the southeast quarter (SE4) of Section
12, Township 6 North, Range 69 West of the Sixth Principal
Meridian; more specifically, the site is located on the north-
' ' west corner of the intersection of East Tribly Road and South
' LeMay Avenue, Figure 1 shows the general location and the
associated drainage, which is tributary to Fossil Creek.
' PURPOSE AND SCOPE
The purpose of this Drainage Study is to determine the impact
1 of this development on the existing drainage patterns in the
area. This study determines the 2-year and 100 year flow rates
1 ;
a • •
-T Harnwny
r•
i6!�
e}
s�q
/
1. •
I
r
h � N i PO7LRtI
r
L L O ti
T�l�l is / t /i:' • ;
\ MAJO DRAINAGr_
1\ll 1 oY
A
COLL . FO `. �' TERL *`
me .;.L Dy SANITATI �D S
-CO, \1Tri i�ba ••`� � �Sf3lJTHS LLI'�1� l ����o woge amens .
SCE TE
TIg��� ,� � •,,.._ __ : �= `.
�f� ►�l ��� 1 AI AG A IN�LIM11 2. '
iAll O O� 113
1' it g000
1•.
SCALE
i11 LE
2
and drainage areas for all developed basins and the proposed
grading plan is shown on the accompanying drainage map. All
swale, pipe, inlet and culvert sizes are computed and shown on
the accompanying drainage map. Flow directions at all inter-
sections are shown as an aid to locating any needed cross pans.
,HISTORIC
The historic runoff from the Portner Estates South Phase I site
flows in two directions; however,. both flows eventually arrived
at Fossil Creek which is east of the site about one half mile.
western half historically flowed to the northwest and inter-
.' sected a drainage channel which flowed to the east and the old
'sewage.lagoons.location, then across South LeMay Avenue and
eventually to Fossil Creek. The eastern half flows east to
Fossil Creek.
SITE STUDY
The site consists of approximately 11.56 acres, and at the pre-
sent time, there is ground cover and.minor structures at the
southwest corner of the site.
' The site is bounded on the east b LeMa Avenue Count Road 13
Y y (County )
' and on the south by Trilby Road (County Road 34).. The existing
Fort Collins Sanitation District old sewage lagoons are north
3
of the site about 1000 feet and the basin eventually flows to
Fossil Creek located one half mile east of LeMay Avenue. The
.land adjacent to the Phase I site on the west is developed
'. (Fort Collins Southside Service Center) and to the north, east
and south is undeveloped.
There are two culverts underlying LeMay Avenue near the south
boundary line of the old sewage lagoons. There is an existing
' 15-inch VCP sewer in LeMay Avenue and an.existing 12 inch water
main in Trilby Road. Previously, the land has been used for
' agricultural purposes; however, the land is not in use at the
' present time.
' METHOD OF ANALYSIS
The method used to analyze the onsite drainage is as follows:
' .
1
1
2.
The site was divided into four areas and a point of concen-
tration was selected for each area. (See Appendix.)
Times of concentration were calculated by using the methods
specified in the Fort Collins Specifications (see page 10
Storm Drainage Design Criteria),for overland flow. For
gutter and street flow, the chart and equation used.were—
from the Urban Storm Drainage Criteria Manual. The velocities
4
were used to calculate times of concentrations. A minimum
time of concentration'of 10 minutes was used.
3. A rainfall intensity -duration curve was used for the site
using the rainfall -frequency curve (Figure 2) obtained
from the Fort Collins Specifications.
4.
The Rational Method (EQ. 1) was then used to analyze the
onsite drainage basins. EQ. 1 is as follows:
Q =.CIA EQ. 1
where
Q Rate of Flow (cfs)
C CC
f
C = Coefficient reflecting perviousness, slope
and soil characteristics
Cf = Anticendent moisture coefficient
I Storm Intensity (in/hr)
A = Area (Acres)
The coefficients C and Cf used were taken from the Fort
Collins specifications. The following values of C and Cf
were used:
COEFFICIENTS HISTORIC DEVELOPED
CONDITIONS CONDITIONS
C 0.15 0.65
Cf 1.00 for 2 year storm
1.25 for 100 year storm
The residential area uses the 2 year (initial storm) to size
5
' the storm sewer and the 100 year (major storm) to determine
' the size of detention.
' Calculations may be found in the Appendix to this report.
' 5. Preliminary detention volumes were calculated by the FAA
' Mass Balance Method. This method requires calculating the
total developed volume of runoff and allowable release
' volume at successive intervals. The maximum difference in
volumes is the required detention.
'DISCUSSION
Storm drainage for the.Portner Estates South, Phase I will be
transported to a detention pond located near the intersection
of South LeMay Avenue and Brittany Street by a combination of
gutter flow and a storm sewer system. Criteria for the design
' of the storm sewer has been included in the calculations attached
to this report. The actual design for the storm sewer is con=
tained in the construction plans for the project.
The temporary detention pond has been designed to detain the
' developed 100 year storm runoff and release the 2 year historic
flow.
A temporary 15 inch RCP culvert diverts runoff under Brittany
Street, at the intersection with LeMay Avenue.
6
A temporary 15 inch RCP will be installed under Brittany Street
to transport the initial storm from Subbasin A of 1�._81^cfs to
the north. This amount historically was detained by LeMay
Avenue and slowly seeped to the east. The major storm will
flow to the east across LeMay Avenue as the runoff normally
flowed.
A detention pond will be located north of Brittany near LeMay
Avenue and will detain the historic flow from.Subbasin B of .
1.89 cfs for this initial storm. This flow also historically
was detained in the low area near LeMay Avenue. This flow will
be transported to the north by way of a drainage swale that
connects to existing culverts under LeMay.
The detention pond will detain the major storm for the developed
condition of 44.9 cfs and release the major storm historic of
1.89 cfs. The detention volume calculates to be 1.95 acre-feet.
The detention pond as shown on Sheet 3 of 3 is adequate to de-
tain the required amount. An orifice plate will regulate the out -
fall from the detention pond by a.1/4 inch plate having_a 5 3/4
inch diameter hole with 5 foot of head. This orifice releases
1.81 cfs. The historic flow from.Subbasin B of 1.89 cfs and
the release of 1.8 cfs totals 3.69 cfs flowing offsite by way -
of excavated swale north to a low area. Two culverts.cross
LeMay Avenue at this location.
The major storm from the developed area will be detained.from
Area A and allowed to flow across LeMay from Area B.
7
This release point is a change from the historic drainage pat-
tern in the area. The change in the drainage discharge point
was made because the construction of LeMay Avenue did not in-
clude a culvert to carry the flow at.the historic location and
because the planned location for the permanent detention facil-.
ity for.. the full development is in the northeast corner of
the property.
The impact of the change in point of discharge on the downstream
property owners will be minimal because this development will
be detaining storm flows to the 2 year historic level. During
all storms exceeding the 2 year intensity actual flows being
passed onto downstream property by this development will be
less than those present under existing conditions.
Additionally it should be noted that upon development of the
downstream property a channel will be required to carry major
flows. This channel should be located at or near the location
. of the historic drainage path. By diverting the flows from
' Portner Estates to this channel storm flows enter the adjacent
property at a point where a major channel would be required in
' .any case. Concentrating flows to a single point should make
developing the property easier, while detaining the flows to -
' the 2 year historic level will limit the impacts on the unde-
veloped property to less than those occuring under existing
conditions.
8
CONCLUSION:
The proposed development of the site will have no adverse
effects on the site itself, or on the surrounding area. The
final design of the storm drainage system provides storm sewers
where flow in the gutters is at or near capacity and includes
a detention pond that will protect both the site itself and
the surrounding areas from any detrimental effects of storm
runoff.
This Drainage Study of Portner Estates South Phase I is sub-
mitted to the City of Fort Collins for approval.
G\STE,f4, _Up}
Y �•
16.
a
t. & tiS
qTf OF C:
Prepared by:
Eugene M. Ross
Reviewed by:
Larry Faulkner,, P.E.
E
No Text
to coo
9^_OO
6000
7000
-coo
5000
4000
3000
2o00
loco
900
800
700
600 `a
S00 ;
p
400 '
Q300
200
100
90
80
70
6o
50
40
30
20
B
From BPR
2.0
L
e eu.r. a.: 0.01, l7I) .9 )•.
n .s •a.a..rss cc,"..:(.r
.. .•:•.re
0
•C.. V.. u•....... r
( o
r•.t n.1
..
- a .s .ac..•cc•a o• c•Dls
saO•t
.08
1.0
•t•V.xc . • a •.xeta_C, •.•eft
-
.07
..a[ .sa 1:....a. n.I
.O6
.80
EXAMPLE ,Istt O.s.to U.tfl
L
i;
.70
-
ll.
•05
-
a.r[.. s • o.oa
too
.60
n :-'w _
30
_50
a, Ott
V
LL-.
r ..eft oft a Gra _
�—__
20
LL.
_
.40
^-----
to
`.
Z
a
.30
.02
CY
--
Y
s
-.20
3
F-
" INSTRUCTIONS
.:
-Z
a
W
.01
Q••r-OS
•rD CO..[Cr
a.,:.••at .Ot ..A
.....
-•>T
Otlt. fat t.tst 1.0 y••ts ..U.
03
z
,OOH
..19.s1Cr •r. ru....a ..ftt •a.
Ox
Q
.007-
(f)
to..0 r[ so.uno.
0
.01
V
.10
.006
!.raft l.aae. h _
i --08
•s lw.. use .o.ec.e..
p
0
•OT
.004
-
LU
/y
cc
.06
..
0.
p
.05 "
.a.••er a. c....e i
(A
e4
atlt•..•t a•r. a (C• 101.L o•lt...oe ..
e.r.ft[ $cc?.*. . T.C. use kc.Oe.... ..
otlt•...t O, .. stt1.0. . raft Of.,.
(i)
a at
.. t:..os.re seer.!.. . - ....)
... reLLa..•(••uc
to as'... a." ... of .. i -- �— f•
stcr.D. a .T .(fc.ro •a•u.at
r•1.1. , y OaL•ft 0� .a.
lta.e ..r.a ,. .•a Ct•1. i ..eft o Q. . o
,JV
.002
.03
Q
T
~ Q .02
let
.00r p
- - L.ol
FIGURE 3 NOMOGRAPH FOR F1 OW IN' TRIANGULAR GUTTERS.
.. • - I'S___.-`.�
r'
'
LG
'
9
.8
.7
ti
o .6
U
Q
IL
0
Z .5
• v
0
w .4
.3
' .2
' .O
I
I
I I
I s_O.4%
• = 0. 5
I 1
1
I
I BELOW MINIMUM
ALLOWABLE
STREET GRADE
I
0 2 4 6 8 10 12 14
_.. SLOPE OF GUTTER (%)
'. FIGURE 4 " REDUCTION FACTOR FOR ALLOWABLE GUTTER CAPACITY
APPLY REDUCTICN FACTOR FOR APPLICABLE SLCPE TO THE THECRETICAL GUTTER
' ' CAFACITY TO C_-41N ALLC'NABLE GUTTER CA=ACITY
0 2 4 6 8 10 12 14
_.. SLOPE OF GUTTER (%)
'. FIGURE 4 " REDUCTION FACTOR FOR ALLOWABLE GUTTER CAPACITY
APPLY REDUCTICN FACTOR FOR APPLICABLE SLCPE TO THE THECRETICAL GUTTER
' ' CAFACITY TO C_-41N ALLC'NABLE GUTTER CA=ACITY
AC I50/5=* S9
3
■ -.
Z
le
K
Use Fortnuto For
.:.tomes in Excess:i
r Of 800 Feet.
���... �:� ��.._ `__-- •--ham
•�L ��^-. —~: •mot h. r_t .O' .. yt.. .�
7.
70
...-.fit-.--tii .: •i---- 1 --i �_-^_�. _ 1' __'__ _-___. .. .: t_ ._
:r. ftri
�•�'... .ate - r_��....:
s ..�.�• W
1 Nl �ic:j: a ...�.:1: i 1• t.•�.... .'J .. .
t rnl.�
34
io
'95'
e .
ivrf�e Ito. ram» Cl,.r.,
to" N
f . FIGURE 8
Limits of
hC.3G.
14"-31j� 17"
3' g"•
��•
Z
(1.1J) (1.42)
\
b73)
m M
`W1
I
i
Flow I . o," '• :::. c . ' :: q • :.:.
�r y .+. .• .10 4.'
�`1D11
JE I 18'
aso) p o')
DRIVE -OVER CURB,_ GUTTER AND SIDEWALK
2' 6'
6.
1 '12-1 4 112
I • ::: •.:
N 1 1/ 2�R
2"R ••'
T
1
410
t.b.�' �.�. ••A....•'• •4 •. <' 'a.
-i a o:'
':4••
Where walk adjoins a curb it,shall be
constructed 114 inch above the curb.
a
SIr
lope Sidewalk to curb-1147to 112' per ft.
fe 4' Min. I
VERTICAL 6 INCH CURB, GUTTER AND SIDEWALK
N.TS.
Edged surface
�118"R
._314'Min:•
_DUMMY JOi NT
FOR WALKS
ry T S.
4AS
2.67
-COMBINATION CURB GUTTER
ND SIDEWALK "HOLLYWOODI(
OBSOLET E
UTS
CURB AND GUTTER DETAILS.
Revised 8-10 72
CITY OF FORT COLLINSJ COLORADO .
ENGINEERING DIVISION P OvED:
�-1
MEN
►�►
-
10
mm
MEN
ONE
INLET INTERCEPTION RATE Q/Qo
0 0.2 0.4 0.6 0.8 1.0
Om�
■��nv
mom►-•��nro�r
v IU
GUTTER FLOW SPREEAD, w (FT)
FIGURE 7 CAPACITY OF CURB OPENING INLET ON CONTINUOUS
GRADE W=1 FT., a>IIN., L=15 FT., h>yo
INLET INTERCEPTION RATE Q/Qp
0 0.2 o_a n a n u 0
v v ! 0 7 IV ..
GUTTER FLO.119 SPREAD, w. (FT)
FIGURE 8 CAPACITY OF CURB OPENING INLET ON CONTINUOUS
GRADE W = 2 FT., 0 > 2 IN., L =5 FT., h>you
-30-
INLET INTERCEPTION RATE Q/Oa
0 0.2 n
■EM.Mo
M■�■■■�■■
MM�NE�..,
■ME■■EVEeE®®
1.MEEO■Q1/'/ir./i■
■MEW
\■s
■O■E�.1�
. �■■■■■MOM
.�tii1./■
Ed
■■■■■■�►
■■//O//
5 10
GUTTER FLOW SPREAD, w (FT)
FIGURE 9 CAPACITY OF CURB OPENING INLET ON CONTINUOUS
' GRADE W=2FT.1 a>21N., L=10FT.$ h>_ya_
INLET INTERCEPTION RATE Q/Qa
0 O
■■■■■■■■■■■■■■■■■■■;
■■�M■�■
W►7.
.
.
,
■■■■■ON■■
MEMO■
•�1J/,M
►/'%
■M■■\►•.
,El■■NONE■
,■■vol
■
mn■�►,,
■■■■
MMa
6 7 8 9 10
' GUTTER FLOW SPREAD, w (FT)
FIGURE 10 CAPACITY OF CURB OPENING INLET ON CONTINUOUS
GRADE W = 2 FT.', a>_ 2 IN., L= 15 FT., h =>ya
-31-
i.cl
182 . CONKCI.ETE PIPE DESIGN ?%IttNUtL
FLOW FOR CIRCULAR PIPE FLOWING F-ULL
EASED ON MANNING'S EQUATION n=0.013
.3
.2
NO
�v
OS 1 .2 .3.4-5.6.81 2 3 456810
SLOPE OF PIPE IN FEET PER 100 FEET .v
FKA `1025 83
DRAINAGE CRITERIA MANUAL
STREETS
'
V
2.0
I0000
n is "OYGHNaaa C01PPIC11"T in "Aw"m
.10
9000
rORWULA APPROPRIATE TO MATESIAL IN
BOOO
Borrow Or CHANN{S ,
7000
JLIS NECV*OCA\ OR CROPS SLOPE
.>
•08
1.0
6000
wIVENtIC{, K K a PROO[EOIN63 I"k
_
'-'
5000
Na[ Iao, [WNION 4g1
.07
. .
.06
.60
4000
70
EXAMPLE Ise, D•aM[o LINES,
log
�
.05
3000
giver. g . 0.03
\
.60
J
SITE . Izoo
so
04
n • OE
.60
2000
so o.Ea (�
zu
I!.
TEND. o • 2.0 cra
03LL
.40
t
1000
�` —
!
2
.30
800 W
1600
x,_�
02
T
C
�.
-
=
Q
r.N
'
500
-T
s
.20
0
400
Z
-_ INSTRUCTIONS
1
.
a
ago
�
-�
.01.
1. CONR[CT a/n R•Tio NIT* SIOR[ ls) Q
.oT
Os
W
/p
lJ.
RNO COwMSZT OISCM•wo[ 101 WIT" =
•O,
z
.008
-
'
200
DEPTH IJ). r"[SE TWO LINES MUST
INTERSECT AT TURNING "At POR N
'Oz
•007
N
.10
COMPLETE SOLUTION. Q
POI
•1
.006
V
(L08
a. row SWSIOW I"'—'-- a--
�I
W
-
100 -
90
V-SNAP[D CWNw{l J
�'
O
.005
.07
—80
AS allow"W{ "OroCRAPN
Q
70
wvl, a. v
.004
.06
W
'
so
50
a. To DETERMINE " ry
a
o
.003
o
.05
40
T.
aaCWARGE 0t Iw j •
N
fY1
.04
a
PD"TIOII OP C"AMNE� lil
'
30
AVING WIDTH w:
;, -• -
D{T[wMIME DEPTH J FOR TOTAL DOCRARaE IN
•O02
.-
ENTIRE 510TIOM N. Tog" use komooma N1 TO
L
•03
20
DET[RM133N{ 0• IM -SECTION • FOR o[PTN
_
' -
A. TO ry
-
' -
Dare"",*[ OISCW"gE
M COMPOSITE Sterloo I. J g N
FOLLOW INSTRUCTION S. 1 ''
¢•
-
a
W
•02
-'
10
TO oST•I" DISCMARg[ in 'h�A E•Y
POOL
Q
_
SECTION a AT ASSUMED •JPIJ-J'/
.
oe)TN s a OSrAIw % ►OR
-
From BPR
SLOPE RATIO 1. AND OePTM Y Tog% "t. OP •Ob
-
' ,
.01
FIGURE 6-1.
NOMOGRAPH FOR FLOW IN
TRIANGULAR GUTTERS.
II--15-68
'
Denver Regional Council of Governments
ONSITE . DRAINAGE & PRECIPITATION
13
FAULKNER-KELLOGG
ASSOC, INS
��o
'--I
SHEkET
NO. OF
ConEn&*em
JOB'NO.
stAting
B 04
Y -A2 DATE
303-232,18076 Fz;
16
oF e0o or
a rml 7 7 0
I
' y -ICIxI�cc -PORTNER ESTATES"'SHEET t�1
¢ SSM INQ JOB NO. o25 0 8
M;c7"orW:wtftlErGirem Sec. 12, ._T 6. N, R 69 W
BYDAM
T' L 303.232$IY78 -.- .�.�f L.
ETj
L .
'4
y S I w -- _ •__� _ J
_ '�ti.J G.J iF•�«-_. a�// �,CV�L /•
_. ` - i /+•'n' - �' —TI•,T _ / F•� 1 f -s`-i• am.--:
r1�M y r j
��x+.'t •.=z .'.'�±a. I � � 1 � I.T-''. /'1 `. � �t i � ± .•j /li I_1� 1 1 - t • + y � ( 1 .. . t
L t--^-fir—!T---t--; -�•—rT.
- �--t•---•_-� , r
�L
1 l3
1
y r �.L.+�.±.��__a-----`-mot--- • - Tom— �-'--•----i— i---�^'-. � - r ;
ii� sr. , '-/�/b�..�•5 _�_49/•!�Jy.Yai� I ' . - --,-_• ' 1 , ' 7,77
1s a� �z C. •� _7-FICi.•i?._�_Y °/./,� • _ / 1 �I lam•_,ksasr 1'r'(�, ..t .1� , ` j. •_-1 '>� a„ —:1. 1•�-�--.-i}�--_\` /L_•( 1• 3 � {+� r5 ' � .. � v - • '
r f P - t + i •�.• �j ; r^'�� .—yam i__T� _.--.....�.•.. .� __�_r
ate, '
�uk'< - i. , 1 Iv.F `. �'`f I , I S y.l �. '' .j., j..e;; -.: f, j - 1'-..i•
•Q4• oft F � r: r ♦ s t { d r � f1
1 __ 7 r .r-t a •- i ' ± i `I I -' '
�,{d� t r'Y ' . I 1 .,�/�, I-)�' •K...__-___ _" • I` '�1� ' t � ( r' .. i i - }i , j I y f �' ' . i
"_ ;aY s , , t/ \ �- -.. 2 T = � - .. i + • t J_ v T
—Ki
x��„t, :� ° ,. `i 5.���^�3a OJ $���a_ '+l '- ; f,' �• :r. ;i• , � ! � i f _ • � . I -
wt.
a .��. u§,cd �° y' ! ' j '. ! t , , . ;. '+ L 'I 7a { , 1 1 1 i. ! i f +..•:.� ; 1 1 -
y_ .
x'r iS i-- I,r••-'�:/F,1E '1� -i=. -bF 1 `_.-T y G' '�::' t ' + ' 1/1.1 i
fiI 1—'r •�, I .� t ! .7 f .i , ' ' f , , ;' _ ;
^ Y.
r 'ter---r «T _ _ --• r -- _.r__-.: .
. I
fdFAULYWE=,GG PORTNER ESTATES' SHEETNO.-I-OF
,
Na
CI Consdft EnOxws Sec.' 12 T' 6. No 1 R 69 W JOB'NO. 02 S - eS
BY D;TE-
303-232-8076 OF ZQOeRfT477()1,J
Ij
17"
;L
*q
:L71'
t I
16'
L � vt-
1 64
- 04
Dt p iF
-L-J
L
A
m
-A
F-L
oL
d,
-s- 64, F & 6) A. KI;44
-----------
f
7-1
kAL�
-T'
-Wi
&ajFAUt(NER-KEtlOcG PORTNER ESTATES SHEET No. 0
& ASSOC. INC. JOB NO. Q2
consw&vEr>gv*m Sec. 12, "T 6. N, R 69 W
-- �(l,. y..... :- BY D=E
303-232.8076 Pn 1 r OF t/ o 1 cc, i TRA-p ok )
i
t -t--+- --t-'- -- -- . - r
LY
o
--------------
Nj
I I _' 1 ' i • _( 1 1 1 , 1 r i j I i 1 I I 1 i
•
�1 �. �'_C_i '`� •"/�/�)l(/���� '
�{'yy��/� ! I 'A T
3 ._L _.�._fyy/.-.' • _..\..w..1
F-i
1
• i 1 i i 1 • 1 VV 1 1 , i 1
jt }�(Jj� tit.—"T_.�'•_ — _ __._ __'__.r._:—___..—.
I
of
1
1 1 ( 1
--,__a_-c—r.�...—�'-:-_-i._.._J_' _ _' ! L_ i • i _I - ! i i
1".j___�_T-t--'I—T—•--__
_ram-..._L._.�._
14
cii � a
B
ceto
w
J
r
IL
c
V
�
q
jM
c
�
N }
tJ
v
C
% C
O O
9
N L =V
aH-Jr• �+ti
p n C) q
OJ :
7 0
S
a
.
•
J w
y. C
,.
`W
r
L
O
LO
u
�
-
•�-
tom,
v,
J
H
j�V
a
o
r�
a n`
1,n
lfl
L1
L�1
,
so
ili
s
_
g
_
o aL
z_
x
a
cs+
N
�w
C)—
o,-.
ov
s
N O
<X
H u
U
C
4. u
Op
>`y
a
A W
y L1
f
0
0
a
5
a
J '
W O.
K
F
O'' p
c J
o
p
O �
N
...
,�
•,r
�9
aGS
. J
'cr+
CIS
go
V
u
::�1
�
l!►
ill
a
a
O
4
d
.
r
7` w
N
x
0
H
H
y
cu 4..
ra
C3 N O
w HA
ca H
CC X
�G
C G U C
M O
W -.
W u
a o a
.`. a "
LV 0
H
y.
>l
C r
J y w
CL
Ly
0 0
O
o
LA
94
-��
<
3
Q
Q
/.. v
9
�
N
9
���
O
A
o
O
.9
�9
�C
r
_
Ui
N
op
OrO
m
a
Q
1
a
-42
C r
p
w O
n 4
zi
O
i
0
W
foil C&
•"� H H
'..{' SL•tCa '
U
x ..
M
w
N w 4 e0
u
c
Nfloa
o"
<►•a5.
Uv) q
0 W O 5
0 0 J A
3
3•
�.
«
LL
E
y
i E
�
Q
A
V -•
rid
_
M
'�
rJ
0 o
c J'
p
co
.�
E
OL
i
1'
i
to
;U\
til
cT
p �
so
u
9
n
a g
r
Q
C s
-
r
•
t9
x
Q "
1 (Hi
td
In
i H
Q v.
U
H O
+<
O n
L
U c
N
O
)a
a
Qrs
�
a
v
a
)
H
N
V
•S
v
tJ to
ca c a
'' G`•
x
r
w
�.
E
M
i..
U
to
i
L.L
17
Zi�1} � w
ca c
TJXcm
boo
• 1. ;- •-• Cl
V3 J
v Cl) ca
O A: CO
riOJn
3
j
LL
LL
o
Q
J
�
c
43
i
~
N
a o
•G
�
J o
U)
J
,
N
M
M
r-•
N
4
+
Cn
.9
j
_
M
V'l
•
cr
9
cq
ij1
E
t,;;
�
j
=
�
Q
v
9
+�
oo
M
N
to
C
O
-�
r
'�
'CIO
to
to o
lu
0o
Op
V
O
O
O
O
Y
_
N
Lr
LIN
O
n
�
_
c
j
C
0 0.
Q
` 3 C r^ 1
of
�Itv
FL i�l
c M
r i E M
d
W n _
L `U
• � e v sU 4
:z
r+
C] H O - -
CA H u
39
O i g to l N LiCI
PC 54
-
N
H
� O
:L W :4
if T
VN
cp
•jc
La
c 4 ,- a
U� e 4.
d lc S -
�l a wa Z
r i• u e C � .�' � o
to c
cn
o y00
o a
co
H V i•• r+O C �� Q
93
W U N P. QO-
co o 3 n - • Q
t
Q
93,
a
C1 C4
7 cw 4 •o o a o '`
i E
V 1
W �
p
o ..-. ..
co
N y '
to
ONO
_
In
_
-a
94
�'c3,4
O_
w � C4 L
o n o f n, fl
to
U O
H
ti
Q N71
1.3 S` -'L
w �� /J O O A_ Q O 4 O O
kn LA
t
_ U
w a N li`d R1 _ c Co
V
�a: LL C eCb
6; e `g r O
..
cl
0 C> � o
CID
n
so 'o
"
I
�
a
y
x
• o
N
lA
Cu
x /�
H
O -0 .
V
H O
x
<
v c
►+
o
w .+
oa
Ste.
,.L
• .+
a
O
H
N
3
m —!�
C
y
V !M Cal .a7
.-. a.. �+
9 C)
x ..
z
9 `.
oil v
w
1
U
o ° ; 0
v H caa
o�nooa
Ln x cc a
MO
o<►»wr_
LO V fn q
7O a_0:.,.%
tp rl n J L3
r
o
0
tt
i E
V
�•
4
•
s
J ' 4
W
�
y
•
O t.
a J o
n
o
� V
_
�
`
n
JC
w
N
�►
®
uc�
w
IL
N
i
�—
CA
S
S
d a
Z
r
LA
N
m
�-
N
.9
a"
<r
a
Q�
-Q
4
d
Q
•a
�
a
�
C �
o .s
V
Q
» o
O 4L
O
r
•
d!m'nFAULKNFA-KEUOGG PORTNER' -ESTATES' -'I L
SHEETNO.aof
I_ ASSOC, INC
Sec. '12,,. T 6.No R 69 W 'JoB'No. olzs;-
-T�BY DATE
303-232-8076 M 7ES�
M�
J-
4
2
rl --t�
it i I
13
-T
ELI.]
5-1 rIn
FAULKNER-KELLOGG -PORTNER ''.ESTATES' SHEET NO.
fAa& ASSOC.. INC .. ... .. .., . - - : , - . , JOB No.
ConsWkvEno*m Sec.' 12* "T 6. NJ 6 9 W
BY-WA-rt--- DATE I-!,;-,P
303.232-8076
1A, "i f T)A. C M I-E-S
VV
I T j,
0 7A 4ELl
en
k
k4-
X__
7
AA 1
711 A I
i - CA
4L
LIU
j I 12�
(Aj
i 1-4
ie-s L. Z4
Li
_T
4- -
f
---------------
v
-7
FAULY.NM,GG -PORTNER' SHEET NO. zej� Na cr
conwav Eng7meem See. "'1'2, '*T* 6 N, F4 69 w -JOB*No. Ozs- PS!!j
BY DATE
303-232-8076 CSEWEAZ 'PIPS "slZrEll,
_71.71
r
------------------
L-L
+ Ll
7ij
Z7
LL
L +
7
- - - - - - -
- - - - - -
-7-
L-L
I r
. .. . . ........
.1
•PORTNER ESTATES.'- SHEET NO.�C=�
fd8 ASSOC, iIG JOB HO. 5 c�
ConsuttingFn�neers Sec. 12, T 6. N, R 69 W By
303-232-8076
FLiN C."SS
J.
e�+T- .�i.�. i_' i �:.17_$_F,'7�..!__ ( �,_ � i•_¢`P i •�u$�,n � ? I
F
_.i' �µ.7li.._'ts`_ �'^'i'd -,. '__i _..�. _'+��.A r_
.�5--�•_.i��.ML^W-._
t
It
It
_.fir'--_�
i
L. .. • i � ,_—.f— ,
It
+
is^—t—A--�
' FAULKNEA-Keliocc PORTNER ESTATES SHEET NO. -0.DF t�
��' & Assoc. we Sec. -
conslrlfing Erglr>eers 12, T 6. N, R 69 W
JOBNo. 02 s-
BY D l is
' 303-232-8078
.••%//• /(��J -'- --:- t - �•�-fir"` ! - , `
Ld-1 , /� 1� ': /i.ri f 3 - -.+1. 10'_5
IL
SDI: L ( •F_ __•+/ `. 1 _ �� `' �1 ; i t : f { - !
��� ► i ; M t t 1 i t � � : : 1 ' _
InL-
ij
i T ' '•1
1 1 j 1 1-�- •
--T
4
,' i ' f I 1 i-• _ 1 I i I- i I i 1 1 7 • + i }
1
........ _ - __. ... .... ......._. ... _ .... --. __ •_.__ .-- -J. -
1
-r-- 1-J. .•. __ 1. � 1
t
,
:
OGG. SHEET NO. -jZ?- OF
FAULKNER=, INQ JOB NO.
��a Consulting Enginews G9 \/\1 BY EM (?— DATE
303-232-8676 e��'Rkcrn Es
E"M OZ4� iao 6A( C>,/ ef25-IzI, uj s
W 0.c) - —3;15.!
T-
T
--J ---L--i
L-L
7
--J
en
f
I j,
--7 I I
II
i1"L 1 i I
-t t7
-7
7
-PORTNER' ESTATES'
FAULKNM-KS I GG SHEET NO. OF
& ASSOC. 1..4a
onsUft Er4reers Sec. ' 12 'T 6 JOB NO.
C
No R 69 W
BY DATE
303-232-8076
-7
L L
tA 0 ob
0
A I
-A i
-Lj
r
u
t
\
\
II
I \\ 11
\ `7♦♦
I
/R /
\ q I ,I
"95Y'
��I
I I
I 1
/ /
VI
Q
a/
a I
v yI.
1 n ♦ /
`♦
// /4q�i I F s
v /
/ I \ I I
I
/ ♦ �' 5WALE bC
I
It
f
m
0
r_. fir_ 1-i-�
/ ♦`♦ .+
`♦♦
E�=/4I
U
I
/
/
���'Ati/
I
Q ._
1 1 / I I
I I
}I♦ /
/ // / /
I
P ,�O /
/ I I
55-/5"RCF
I OURET
I'
�Lq
C
1 \
h/ `♦/ /' 1
/' / "yLh I I
I
/ IP / "q26
/ 1 I
P/PE
/
/
Cmi
Z
Q
1
l� 7♦,. L / 1 /
/ /
/� %E / qyP
UTLE /Fl/ \
IV
N
7
/
%f•6TL. FQ\\
I
W.
Fo:
♦O,qr
♦`O�/)
+918/
/
1
I
l.q�
O
(i
a
vi y
0. 90 / / I I /
L�i A"DIA MHjY�
//
0
[V�])
ems.. ♦�
/hq4�
, / / 5'-R TYPE�(lvLf7
/
\\ I
ISki
/
I 1
IY/NLE7 I
\
/
/ / / /200. •^/,. U_=
y phi
6� I�
\0.'u
h9 ,
II I
F7-1
I:
I
I '��♦
I
ID
I
�
F7
/ I /
I �o ♦`
1 1
�,
I 3'I. i�%mil I
:�
I / / �T♦��e- /".tr'e'.we'r
I l / ♦'�
T (� Trou i
yl
I
a'
e
/ Z. �3 I I
I rr
♦,
l , t / I
I ��� /
! _ / A /,
♦♦m syn
/�zeou/0A)D
O
/
I/ �g� I / R.
N -ilol.
o
a
WWI
aj. ♦ do I / / /
2Q�♦♦♦A, I1 /
/ l / ♦ N
♦`♦
L 49/O. _
/
\
/
-TI'P
I I
/ /'
Pt2 I I 1 /
/ / I I i
l,♦
l�
/ / /
/�/cET
1 /
P ♦ \ti'r (
( 1
I 1\ \\ \\ I\
/ /' //
♦
I
e \\ \
`II \\
`
\ I\ I I I
*�cQO 4
`♦♦ `''6 '_
/$ 0 1
w
\ \ \ \ 1
\ I \ I
\
I
"
ItC
S-YZ-TYPE\ \ \ \
I I 1 \ I A 9 I
I
\ ♦♦ \�/
/
I
MEN
0
p
INLET\ \ \
\
\\'
♦ I StVALE -b
\
iJIV
I
0-22
+.
c
I \ \ I
\ \ \ \ \ \ \\
I \ 5WALE \w -A
j
w
W
m
0.87 I \
\ \\ \\ \\ \ \
\ \
w
r
\
a
c
v�
\\AR-kbC?w`
-
�
U
3
u
0
Won
4
\ I
\
\ I I I I I
I I� `•_i���__-i
I \
\ 1 \ \ \ I
l I I I l
ALr7mil
C NIOUR IVE4Vk L' \
I
L
/
1
![VISIONS
1,
1,
roof
„*AR
\ �
1
L_ � 1_ � `
—\ —\
C � i
BY RO
tYLAD \q
m
_
qp�
—`,
\
ShooI
No.
/I^�
/
Nov
No.
025-83
VICINITY MAP
STALE i' 12"'
o,.,.z.os /
<n/47 /
/ SOUTH FORT COLLINS
ISANITATION DISTRICT
LAGOONS
0" /m zoo
suer.
C L Z •
i
\1 \1
v' 1
°
i I
/ I
y
/
z
0
LUWF4T9
LEGEND
\ \ 1 Olf-Zas pe BASIN NDESIGNATION
4.298 ).00 AREA IN ACRES
N \ � w --n ->. HISTORIC BLOW DIRECTION
z
z ����� I
1 Ill sAaW SOW DART
OE81ON EO`NT
iw
I I I \ at
/. 00ANEA INAqE8 gxZoel. 2-YEAR STRM0,.:5 Ue6 100-YEAR TOgM •Z5/ TIME OF C NCENTRATION
x
°
W
o
O
J
W
oQ
>
o
z
WO
Z
w
E..
C)
d
i
Qli
_fn
Fo.
05
>nJ
U
wo
c
>;
zo
le
P4
11 REVISIONS
Shoot NO.
1
025-83
/`I
z`
I.
F�Nhyi
SIC
r
Q
W
�SOLITN FORT COLLINS
Y
W
Ul
0
SANITATION DISTRICT /
Cl
��r41CL
PORT X Fl7._FSTpi ES. SVJ TN I• -rrr
LAGOONS I
TYPICAL
SW LE SECTION
f_,
Z O
I
..I
w
SNAL DIMENSIONS
o a.0
[�11��
�,
I
~
-. i Y r ad
_
SNALE
OICFSI III) W(FT) H(FT) Y(FT)
[�
J
A [// AJ \ 1\�� Sc4Lt' I Am, \ \ \ 1 \
A - A
9 - a
4.T3 0. T.2 1.T9 0.99
13.62 2. 9.0 1.26 0.26
^
7
FY
O
1 � 0... -c.a - e'
o
c 3
;1�
_
O
�S...
1'
/ / 'j�i
1 (()\
v`;��
[ A A AA V A V
\� \\`\`\\� \\ \` \\
tns nna a•cuveFrt
FO3
Wei
) J•'
\ \
WCIN/rY MAPXALE
C
rt/I
�
.V
I
\� IIII
�
�TEN/RIRARry
�♦ I I I
\\\i00 I♦♦ /
__ � I I N , :
__..
_.._. __
O
d O
♦ / 1 I
♦ /
♦♦ 1 9QQ /a+.•ucr / I I 1 /
I'
1 /
,F'YTIQV ENO ' li
I /.// I 1�9L. LAO K
..Y�.'1`.'-'. 1 Cl�j
`
C 3
•01 Y
.
1
I I
44 t~ ♦ / /� P�/40 I I / I l
I I I♦ / ,n'
ID
I .eb: RRtt {el /
1\ V I
Lu
C
ry
q•asA.
A4 I
i / L.It /
Z
0
<
/
1}
�
_l
l lI I ♦ /
7% // /
J I
d
e:
.r
46
�/
/ / I ♦♦
1 491D
♦�Y /N)IM,
e m
/ I
♦�'
E
LEGEND
quo
o
// uI R,�'.
►
I \1/ a/
c&77��
l
11
cMo
C
^
49/so
/
rl
F, •• K\\ `� \\ \\ I\ �\ I
I\ I 1 A-ro \ ♦1 ♦♦
r
A
BABN DESIGNATION
Y
\\
\
I
lDO
AREA /N ACFES
'
\ \ \ \
\ (SWALE
\
\ \ A' tT{ U
—
HcromC FLOW DIRECTIONaA-8
oil
*A
I I I \
\ \ \ \ \ \ \ \ \
mmm��
BASIN BOUNDARY
I II / % / 11
II \\I \ \ \\
PROPOSED CDNTOUR3
E
/ 1
�� \I 1 f / /
I
-
\ \� \ 11 \`� \\
IM
7R4N5PORT \ I
/
I ICI /
~�/ / / I
I I
I I I 11 II' 1 \ \
W
/—
PROR11E0 GOT LNIES
'\
SLOG. _
I \ I \ \ 1\ \ 11� \ I i 1
1 I / +'� 1 I I \
1 >
B45I0 AREA
1.
1
/
5T02M
\ I
I
I I I
Z"YEAR
STORM
TIME OF COgtuTIZATIDN
9$4
i
so
REVISIONS
I I I
i 1 \\
IRIS
Do"
OES/61/ POrNTI
sZ/--
/
o5L m 4•Lm=4
$
wrsaar to SLEW ANNEAAT/ON
!
Sh••f
No.
FII• N°' 025-83