HomeMy WebLinkAboutDrainage Reports - 01/10/1990No Text
FINAL STORM DRAINAGE REPORT
for
SOUTH GROVE P..U.D.
(A portion of L'ot 8 and a portion of Lot 9
of Observatory Heights Subdivision)
iCITY OF FORT COLLINS
COUNTY OF LARIMER
STATE OF COLORADO
November, 1989
Revised December, 1989
i'
Prepared by: Parsons & Associates Consulting Engineers
432 Link Lane Plaza
Fort Collins, Colorado 80524
Project Number 83.12 OIL
DONALD M. PARSONS, P.E.
Professional Engineer #1313
TABLE OF CONTENTS
COVER LETTER
INTRODUCTION
SITE DESCRIPTION
PROPOSED LAND USE
HYDROLOGIC ANALYSIS
DETENTION STORAGE
APPENDIX
ENCLOSURE:
Grading and Drainade Plan
f
1
PARSONS &
Ire- 1 ASSOCIATES
CONSULTING ENGINEERS
December 28, 1989
Mr. Glen Schlueter
Stormwater Utilities"
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
RE: South Grove P.U.D.
Dear Glen:
Enclosed please find the "Final Storm Drainage Report for South Grove P.U.D.",
dated November, 1989 and revised December, 1989.
South Grove P.U.D. is presently a semi -developed site with numerous buildings -
within a vegetated area. The proposed P.U.D. is intending to raise the build
ings and to construct two roadways which will service the interior lots along
South College Avenue between Horsetooth Road and Boardwalk Drive.
The intention of this drainage report is to present the methods employed that
will alleviate the increase
stormwater runoff due to the construction of the
roadways. This report has been prepared under the guidelines of the City of
Fort Collins Storm Drainage
Design Criteria and Construction Standards, dated
May, 1984. This submission
incorporates the comments from your department
dated December 19, 1989.
!
'
If you should need additional information, or have any questions, please feel
free to call at your earliest convenience.
Very truly yo $ '
4 QyNOr,I Si ys.
P R
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4a 4� onoynoo U sr
+A�61, �G1&TEIP�-�',,rs
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Donald M. Parsons, P.E.+���
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432 Link Lane Plaza
Ft. Collins, Colorado 80524 [3031221-2400 _ __
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VICINITY MAP
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BORLAND
'H-ESEFORD DRIVE
SOUTH
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PRELIMINARY
SITE PLAN
40
0 30 60
� , I
LU
'
FINAL STORM DRAINAGE REPORT
SOUTH GROVE P.U.D.
(A portion of Lot 8 and a portion of Lot 9,
'
Observatory Heights Subdivision)
FORT COLLINS, COLORADO
INTRODUCTION
This report, in combination with the final utility plans for
South Grove P.U.D., is intended to describe the procedures and
results of a drainage study of stormwater runoff generated by
this project. The historic conditions and 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. ;
The purpose of this study is to determine the quantity of
stormwater runoff generated from SouthGrove P.U.D. and the
'
manner in which it will be accommodated by this project.
I:
SITE DESCRIPTION
South Grove P.U.D. is located on the east sideofCollege
Avenue between Horsetooth and Harmony Roads, on a portion of
Lot 8 and a' portion of Lot 9 of Observatory Heights
Subdivision, in the City of, Fort Collins. It is bounded on the
i
north and east by Lot 7 of the Observatory Heights Subdivision
on the south by a portion of Lot 9 of the Observatory Heights
Subdivision and on the west by South College Avenue.
PROPOSED LAND USE
'
The developer of this site is proposing to construct Hereford
Drive from College Avenue to beyond the intersection of
Mitchell Drive and to construct Mitchell Drive from Hereford
'Drive
to the boundary of Lot 7 of the Observatory Heights
_
Subdivision. The roadways will service the interior lots;
particularly Lots 7, 8, and 9 of the Observatory Heights
Subdivision.
'
HYDROLOGIC ANALYSIS
'
GENERAL --The Rational Method has been used to generate
stormwater runoff flows for the 2-year and 100-year return
period storms. Runoff coefficients used were based on City of
'
Fort Collins Storm Drainage Criteria Manual.' A composite
runoff coefficient was calculated for the pre -development
!
condition and post -development condition of the site.
'
HISTORIC CONDITIONS --The entire site plus approximately 1.68
•
acres of land to the south drain northerly and easterly across
the site. Offsite flows are 0.54 cfs and 1.93 cfs respectively
for the 2-year and 100-year frequency storms. Onsite flows for
the developing portion of the site (including the streets) are 1.24 cfs
and 4.55 cfs respectively for the 2-year and 100-year frequency storms.
DEVELOPED CONDITIONS --Under developed conditions,;runoff from the streets
' will be directed to two temporary retention basins on Lot 8 of the Observatory
Heights Subdivision. The northern half of Hereford Drive will discharge
through a curb opening at the intersection of Mitchell Drive to Retention
Basin "A", which is located on the northwest portion of Lot 8.. The southern
' half of Hereford Drive and.all of.Mitch6ll Drive;,will.discharge.at their re-
spective terminus into Retention Basin "B' which is located on the east por-
tion of Lot 8.
' The water that is collected into the temporary retention basins will infiltrate
into the ground and eventually discharge into the Larimer 0l2 ditch as ground-
water or interflow.
i
The temporary basins are provided to store the volume of the increased runoff
due to the construction of Hereford and Mitchell Drives. These retention
basins are strictly temporary basins such that when the interior lots are de-
veloped permanent detentionfacilities will be provided on their respective
sites. Thus, the permanent detention facility will provide stormwater measures
for the developed site as, well as the portion of any and all roadways adjacent
to that site.
' As Parcel A is_developed, the parking area will serve as the detention basin.
The outlet will be controlled with a restrictive orifice and will discharge
into the gutter of Mitchell Drive. Because the Mitchell Drive Right of Way is
dedicated,'a drainage easement will not be required to the Larimer #2 Ditch.
' A drainage swale will be provided to carry the outflow of the detention basin
to the ditch and, at that time, approval will be obtained from the -Ditch Company.
' RETENTION STORAGE
As mentioned above, the runoff from the developing portion of the site will be
' directed into the two basins where it will be retained with no outlet. The
retention basin volume was calculated based on the difference between the 100-
year runoff volume and the two-year historic runoff volume multiplied by a
safety factor of two. The volume of Retention Basin "A" is 24,880 cubic feet
' and Retention Basin "B" is 2,135 cubic feet. The two retention basins will
more than adequately store the one hundred year storm runoff.
APPENDIX
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KHOO, WAR WAR PRIMITIVE ME POP SOVIC111
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NOTES:
L WYTCAT T4P3 TO EX/ST/A/S MOUSES TO BE
A84NOONEO AT THE MAIN BY THE CON- /
TRI LTOL.
Y. THE EXIST/A/Q NUALO/N6S AND FEA/CES
A! 'ro BE A!EMOVED.
9. TEMPOLgRY .@ETENT/ON PONO8 TO 8E
4ECONF/OUA?EO AT T/ME OF FINAL S/TE
PILAN SUBMITTAL. AMINTE"AMCC OF RETENTION
PmOE$ OT as 7N MOF LT�S
1f ATRMANENT OETENT/ON FgC/L/TICS FOl /WA'CCL
A TRY BE ApOV/OEO ON S?E NY USCR.
E. M/TCNELL OR/VE RUNLIOAF TO FLOW UNOETq/NCO -rtJ
LA4/MER N�NII ANN APP�/MA%ELY J60 FFA
M9A�TN, W /TCAELL VE 5 CONST4`UCTEO
TMROVOM FEENEY SUBOIVIS/ON.
G /f M/TCNFLL OR/VE � OF TN/E S/TC /9 NOT
fONSTTUC TEO FP/O.e Tn UwM4!YL MENT OF TNss
JS A TO 6gFIMCT NE IWR FISEMENT WILL BY
O/II/NCO
INTAS
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FEASTING PAVfIIVT SPALL OF MAN OR NAVEL
Off
m nor
St., AffIffm
CUT M CAPTAIN A STRAIGHT AV7 NIVAT HOPE
M PAYING AFTER CAPRIOLE TO INSTEAD OF
MEN PAVEMENT ,
2
PRIOR To F%STALLATION OF CATCH. AL
EDUFF OF LDASTIVG ASPHALT SHALL HAVE A
Alp
ff 11.11.1
TACK CANT APPLIED.
I'll, A
3
74 SPECIFIED. AFTER ALL ASPHALT HAI BEER
AM Aw , IASI
PLACED, ALL SUMS BETATION %TV AND LEFTIST
mAm"',
CAROLINA X,`11
PA� RECALL BE TEACHER WEST! AN ASPHALT
EASE CAST
THE
or n �E�;a � °� , ASPHALTSMALL PAVE
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ASPHALTIC mSCR WHICHEVER I5 ORWTm.
W
PIN
DETAIL NO.2
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CITY OF FORT COLLINS, COLORADO
"L`'OCD H-m
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ENGINEERING DIVISION
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ASPHALT PAVING DETAIL AT
CROSSPANS
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SECTION A-
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9ECTIONS -11
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A.
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IS TAL'
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SECTION C-C
re..a
CONCRETE SIDEWALK C
VERT
FOR VERTICAL CURB, G
JTTER
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AND SIDEWALK
OF COLLINS. KOHL
IRADO
L. VICES ul
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\ SgSE TOPPED WITH 2'
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TFVALVES E
6�EE ^f/TB.
TYPICAL CURB STOP LOCATION
J Ll
a. \rT_(4i
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168 Acres
�� dv _4\
OFFSITE DRAINAGE MAP _..
I
IRE HYDRANT DETAIL
CITY of FDRF cowvE. C0.oRADO
,rrao
PERSPECTIVE
VIEW
LL =
NFL
IWFn
NEW DRI
WAY APPROJU DETARS
TICAL CW IID mITTER
TIDY OF rdn COLLIE
MLORA00 I i A Yam. INVWD ,-_
PORT CLLNS -t m WATER DniNCT
LPxx rcm COLLao
a AT DSmcT
UTILITY
PLAN APPROVAL
APPRDVEO
xxY4ER
CATE
APPROVED
CISTEW ENG EEA
ATE
PARSONS & ASSOCIATES reject 1
.YYLink L.nePLB, SD.L: �NDm Bs.'Z DIIC TH GROVE P.U.D.
CONSULTING ENGINEERS F1. Collins.221--Y;UU 50329 D•BtMmon: pnpe:a: *°D GRADING, DRAINAGE AND UTILITY PLAN yaC. O'BB
m
L
LEGEND
c9� EX. TREES TO
�8 REMAIN
1 EX. TREES TO
BE REMOVED
EX. BUILDINGS
TO REMAIN
EX. BUILDINGS
TO BE REMOVED
C
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I
I 1
1
GREAT WESTERN I
F CAPITOL CORP.
I I 1
L - ihb
v ll I
J.S. & L.V.
BORLAND j
hb L — — — — — — --
I
--- L _ J
FOOD
11
RESTAURANT
►7
1 1
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I I
I II 1
I 1 1
II LEGAL DESCRIPTION
xrvOw u( MEN or PIFY PFFYNrs fear the under ip o l nMp the mews me
w 1 j cc 1 Alternators Oro The ",amp ee,vON /me. fa -ail:
t— Z 1 NN Coot awfAm a/ the Northeast awe.. o/ Ge[ew ]G yom"n p
Q w J three. prove 69 "at If In. Set P.M., La,d e/ CIGNA caw more pwrkWwly
U J ae,ndee., kpo.s
Lu
O Ll- aporbo o/ Lot b me a P,-hb, o/ toe 9 Wso orwY Xeiplf+ 6WdWMy
��— a Cwmly It iwine. AWwood also OMp o pwfat o/ booth CoVp.
Prmsre.. A,,m AW to The any o/ Awe CWAy CtlwoLa all Cos mo"
Q J I J I Pwli wwy doweM or "Dan
CmsHwn.p the Wes! Cos o/ sod Nwthrv+r awre, Of swrem .Is a. Arledge
= Li- torn M79'.M' fast We Plea all Cost Contain" nand .Mayo mmfo
H , Meferpoot or (he Nw Atorh [wnw o/ gale Sx/bn J6.' Mwc. Wwp
w N Ansrah es sae Nwof'ooest lot a smth ro ur A eml effCo roar
\ to the ni the [weer er Me lot a wee the mud peen fast
MWfar'
O Li fn,nn Wmp Me NwMMl lee of eel t. Nh . 6OPOW0 fos! l o4d w1h
re
f' 1 mc. re In AL 51 J5. lose
Fa,l feet to t.a plot
a Mrs, 1, t gale N✓MMy
ht
V)LLI 1 ear Sore wim/ drier of }]6 W' me o aonl m o mm fe Ms Menc
norPp o [mint Me r o/ osmeh ' one o .Dews et Y6)W and
teen[.
N 1 1 shoo
ono don9 me are -m Sw1,Ny Al/9 /sl ro the me o/,aie [w.0
0 fnmar rm9+^I hi
to sod avow sooen of,& West nee /eel m
Q I I poser Co o eels w me tart WWI o cenlom rv.ye If dAt l:u'n" ,fe o
= d o o/ I I MI: ld,n[e dmq 0e Corn Sauln f y 2175 feet to M.
.na o/ sad mono the S dm9 0 /f I maid to of cum SOP eN hold"
a c 62C0 p, to the 946-We 0/ a nm-lenpenl mow to ,, /Im narNp
J_ e'�• -. . p [wr(I"Gal✓a./ IlWY6 me o roA4rs o/ be it If I Mmv cmo,oir9
1 — -- flop IM own NwOm,MY ".Pal elders A t 96 a/ seal the Mm
roper horn ede qm,wh,, SeoP ee ]Oar allo J]9.6P heI la the xl,l
h b 1 I 1 me of the Cob NwPle+r a to the rnm[e Nwrn OOz9O6" Wr,e aaxeo
Mf dw9 +^ie W++leolY lee to Pe ]AUF PWN/!Y BFGWNNG
Me low eesw0" haf [olds 2.0 areas. move w Ana me lr sofi
I to As
o',,,r refs me foes -or -me" on mm d air uTp w I,Gno'emi n/
I 1 1
I 1I 1
LAND USE BREAKDOWN GENERAL NOTES
sil.nee first me v ..q rl As ..-.rtt A..n.r... a
l be subm tale `Planning ..elxoning • e for review
r .r.m a.... 1.n e. .n err... Il Prior to tea. 111,11, It any building Palate.
I. also..1 If . P... uy botl. .Ill be
entitled with the ,.L.lrt.i of the Final F.U.C.
.nu . u • 1• suet ...u, n Plat anduttllp plan, bLL ...uu..in ue
morale I.NG all 9
.1. t ` -CilltY Pill' 1.1 at... enin.n area,. Ability .,Ins and
....
1 .mi p..ee uw w It s S. All Pealant ,f [ anterior Valle of the tint . ely It a
b.ilein . v u; .e[N, ISO- a .n ...... ...away II
1 �..ra .oar .. iIva .lui a: `will be .ie.i tine :: e..::a ••`t.. tea.
n.a.nin neAILhIlIty .ein . b e sateent, I of t
1c, the
to, as
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PROJECT NO. 9150
DATE OF PREPARATION 12-04-89
REVISIONS:
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