HomeMy WebLinkAboutFORT COLLINS WHOLESALE FLORIST - PDP/FDP - 18-97 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTEFFECTIVENESS CALCULATIONS
PROJECT: F,cr 61,4-,Ns tJ,4,t� ,act FZo-z,Sr STANDARD FORM B
COMPLETED BY: 15�s, Ekk,e )f-c-405 DATE:
Erosion Control C-Factor P-Factor
Method Value Value Comment
DJE Ip SNoe - Cz y. e LT,o,3 orJW ?oST C..OI-��P-Jcr, o..l W>''S EIa-`.✓.o��Y?
�05� �on15T2.,c-rvrJ.:
ham o.ol I.00
�sraausEo Grs«ss p, ors -
MAJOR
PS
SUB
AREA
BASIN
($)
BASIN
(Ac)
CALCULATIONS
A
78. I
A
/. 72
PvrD /. 32 Ac. = 77% .(1, 32AI)
£sr. G2ASS 0.1/0 AL ' 25'i- 0.4o Ac�
Wt C-Fincroe = [0.77 �0• oi1.32) + (!o.23xo.0�5��•'�o�J�,�2
p- FALTD�
Er->=
l00%
MARCH 1991 9-15 DESIGN CRITERIA
K!
TABLE 8-A
RAINFALL PERFORMANCE STANDARDS FOR FORT COLLINS. COLORADO
FLOW
-. _
------
-
LENGTH
SLOPE ($)
(FT)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
'6.0
7.0
8.0
9.0
10.0
20.0
30.0 40.0 50.0
100
70.9
74.6
76.8
78.4
79.5
80.3
81.1
81.6
82.1
82.5
83.0
83.4
83.6
83.8
84.0
84.7
84.8 84.9 84.9
200
72.0
76.3
78.2
79.5
80.5
81.2
82.1
82.5
82.8
83.2
83.6
83.9
84.0
84.2
84..3
84.8
84.9 84.9 84.9
300
72.4
77.0
78.8
80.0
80.9
81.6
82.5
82.8
83.1
83.5
83.8
84.1
84.2
84.3
84.4
64:.8
84.9 84.9 85.0
400
72.6
77.4
79.1
80.3
81.2
81.8
82.7
83.0
83.3
83.7
84.0
84.2
84.3
84.4
84.5
84.8
84.9 84.9 85.0
500
72.7.77.7
79.4
80.5
81.3
81.9
82.8
83.1
83.4
83.8
84.1
84.3
84.4
84.5
84.6
84.9
84.9 85.0 85.0
600
72.8
77.9
79.5
80.6
81.4
82.0
83.0
83.2
83.5
83.9
84.1
64.3
84.4
84.5
84.6
84.9
84.9 85.0
700
72.8
78.0
79.7
80.8
81.5
82.1
83.0
83.3
83.5
84.0
84.2
84.4
84.5
84.5
84.6
84.9
84.9 85.0
800
72.7
78..1
79.7
80.8
81.6
82.2
83.1
83.4
83.6
84.0
84.2
84.4
84.5
84.6
84.6
84.9
84.9 85.0
900
72.7
78.2
79.8
80.9
81.7
82.2
83.2
83.4
83.6
84.1
84.3
84.4
84.5
84.6
84.7
84.9
84.9 85.0
1000
72.7
78.3
79.9
81.0
81.7
82.3
83.2
83.5
83.7
84.1
84.3
84.4
84.5
84.6
84.7
84.9
84.9 85.0
1100
72.6
78.3
79.9
81.0
81.7
82.3
83.3
83.5
83.7
84.1
84.3
84.5
84.6
84.6
84.7
84.9
84.9
1200
72.6
78.4
80.0
81.0
81.8
82.3
83.3
83.5
83.7
84.2
84.3
84.5
84.6
84.6
84.7
84.9
84.9
1300
72.6
78.4
80.0
81.1
81.8
82.4
83.3
83.6
83.8
84.2
84.4
84.5
84.6
84.6
84.7
84.9
85.0
1400
72.5
78.5
80.1
81.1
81.8
82.4
83.4
83.6
83.8
84.2
84.4
84.5
84.6
84.7
84.7
84.9
85.0
1500
72.4
78.5
80.1
81.1
81.9
82.4
83.4
83.6
83.8
84.2
84.4
84.5
84.6-84.7
84.7
84.9
85.0
1600
72.4
78.5
80.1
81.1
81.9
82.4
83.4
83.6
83.8
84.2
84.4
84.5
84.6
84.7
84.7
84.9
1700
72.3
78.5
80.1
81.2
81.9
82.4
83.4
83.6
83.8
84.3
84.4
84.5
84.6
84.7
84.7
84.9
1800
72.3
78.6
80.1
81.2
81.9
82.4
83.4
83.7
83.8
84.3
84.4
84.5
84.6
84.7
84.7
84.9
1900
72.2
78.6
80.2
81.2
81.9
82.5
83.5
83.7
83.9
84.3
84.4
84.5
84.6
84.7
84.7
84.9
2000
72.2
78.6
80.2
81.2
81.9
82.5
83.5
83.7
83.9
84.3
84.4
84.6
84.6
84.7
84.7
84.9
2500
71.9
78.6
80.2
81.3
82.0
82.5
83.5
83.7
83.9
84.3
84.5
84.6
84.7
84.7
84.8
3000
71.6
78.7
80.3
81.3
82.0
82.5
83..6
83.8
84.0
84.4
84.5
84.6
84.7
84.7
84.8
3500
71.4
78.7
80.3
81.3
82.0
82.6
83.6
83.8
84.0
84.4
84.5
84.6
84.7
84.7
84.8
4000
71.1
78.6
80.3
81.3
82.0
82.6
83.6
83.8
84.0
84.4
84.5
84.6
84.7
84.8
84.8
4500
70.9
78.6
80.3
81.3
82.0
82.6
83.7
83.9
84.0
84.4
84.6
84.6
84.7
84.8
84.8
5000
70.6
78.6
80.3
81.3
82.0'82.6
83.7
83.9
84.0
84.4
84.6
84.7
84.7
84.8
84.8
D
RAINFALL PERFORMANCE STANDARD EVALUATION
PROJECT: STANDARD FORM A
COMPLETED BY: Tsr + •�c . rs�,s , �c � � �Ec�.S DATE: s- - is - 9;4
DEVELOPED
ERODIBILITY
Asb
Lsb
Ssb
Lb
Sb
PS
SUBBA§IN
ZONE
(ac)
(ft)
M
(feet)..
M
M
A,
%ZD
zo
MARCH 1991 8-14 DESIGN CRITERIA
LL I NI 7/T�
<— —� � L— �•—. it
z.4- iG. •_\-- —�1.0 L�l
r/ o�oi,sa E N oo•or; 43 G �- 1T30.BJ
If 1
/ NOTE t Shie)ds' irriJa}ion diic
fro... FCOI-oact R/,v
I \�•-� / / � / PARCEL � / and �rorrl Gal}" COVrfE
Wcoro pos a to no'
Z / \ dis+vrb S�ields4d r
DETELTlON REQUIRED = 418660
DEN99Lccc.�.A
OUTF�0.377cfs , 9`. e.
44
r `• oL` f/ I
o!eAj
FUTTE STFt EI— .A,fJTOMATI I, DtZIVE `` v
/ b
2 O
CCkICT 9- CATCH f3AS/A1
/ QrM: /1.5 <Ft CO = Ft COP •W fZN I 1 NE�/+OW.aac SQ.�r� "• �. // / / GZ AL 2.9 T- �l� / — coNsr 4 CP1TCl7 3ASM1;
a t Q �/
H d PA.05
RGEL
PARCEL I / / / 0 ♦✓' / IQ / / O�
cy
u lY y 0.
/ �• '� / PRCE[. / 2 `i'i N Q _ 'y�� .. T o P �� / f�_• ` .G.
u .d c p"; 1 C�NTTO rGz '� / O ia• F/a15>s
b •�! PriRCEL
Za Ob 1'" / / v Go nI TOUR �\
Q• ,06 Q/ M / 3.8 .�Yc. 3. O r �/
r�Q ^'ae,l¢ z FUG z �. s/ at,
i \\
�Jt� (/ /``o • j/F yED / /I41.5 RLP
OcIr, / /oc 14.$ JS - / . 4 4'i /fNV: 43. zS t. Lill
—
/ / r�w ty 6 4 co/.IcaETE Pall 9 `5'IS
/ ~. t V. .z is-is'rscv 30-lSRCA-'T PROPOS+':D 24`'OVTF.aLL PIPE
/ a s•/ F� �(P"R PFRIVIUVs
7., \PLAN l_..►�
i i 1 S OO�oa'44rG 29a.a0• --Y-— --\ $OOP--�49' f 30 TIM°ERL)NC OV_ FLN/ -4,7.0 �Tc1---•—
' _-- ���,� p�—yam �1�7.�e_�.-- _--�\--- C` •�_ --tei��__�----_--
_— — +-H YT�C� �1 V G.�- / �\ v/. S Ae . 24 P ,
C•'� C' lL �- �',+ Cw57 Y4 GORnHR sEC T1oN 3✓=j-f.'�--- FxlSr 4Z'• rtc
LU
wE
2SOITc/-7�
INC
°;
CO
rry� V%
Ozo
14. or- 14-
iCQ
bp•
I
i
,
1
-��
t'_--------
1
I
,voc�
�
Hey,
,
7
AMENDED 01/ERALL DEVELOPMENT PLAN OF
COL L /NDA L E BUS/NESS PARK
SCALE-/%/00'
O SO ,00 r00 e00
RLP Zone
MEADOWS ; SUBDIVISION
I
PHASE SIX
4.5 acres 9rv"_--
4.4 acres net �%
1 6V
NO 9
f / .
�? 1A
Zon�,�/ ; -•- h l ell
4 abode
1 o a SE E
HA
1 1 / l rxy ti
9.T oeres gross
8.2 acre/a net
I
.. s00.0/'JJ •W _�__�
LEGAL DESCRIPTION
.I A tract of lead slteatf In the Oast } o/ Section 71, ierMlp 1 YortA. Ranps
:L 68 Nest the SIsM I.M., City of Fort Co1Hna. Cents of tarlrr. State of
�p0
Set
of
,...• Colorado. thich. c0asldsn9 the East it. of the Northeast } of gold Section
ri
i•"•ro• �_• • 71 a sh.ring S OD' OS' DD. E .d seth -11 sautn9s gonalad hareis relots.
the Ea toles Nap In at the Oast i Career
GT YA
e , • tMrfto. is contained e1Nln
.0" he East Ilne of the sautMat { Of
coded. elm,p
-J
V
3 , of tfld setton 21, and N'
tests
Sctlan ]l, S DD' 01' ]T N 871.62 bKi thence N 89' Y' 21• N 70.00
•
• gold.
/at: Mare M 7a' 01' /8• N 291.97 het; thra N p' 52' 48• • 279.45 free
•
• thence N 76. 51' IS. N'a7. 11 fat: Mahc. B 81' 49' 26• N 716.81 bet te the
-
• East r19h t6 1igo of the wtr Pacific Railroad: theec..1she Said ri0ht-
trio
r'P i l,r t 00' oo' d7• E 1911.2s test; chant• S 89' 56' 27• E 1058.I8 lest
j��a��7r}}��
-�".,'��,J -�
d of
i • tp a riot pre cse Pier of the IbrtMat } of aid't Mq. elaw9
beginning,
,'
CF
of I1
2 i aid East Ile. S 00. OS DONE 1770.19 fast to the oelnt of
DO.
lab had Ming wspect 0 all he
•
7
yy • cwalnl no 49.:2 airsb .ore or
F "� ad rlgharof-shy caw a Plas,or of record. -
I
:
RLP Zone
t nLLINDALE . 'GOLF
RAILROAD
PHASE THREE
11 5.4 acres gross/
J 4.9 acres net
PHASE TWO
114.6 'acres gross - --
J 35 'oeres'net
/ IP Zone
`' . r PIfd4S 'ONE
/ 4.4 acres gross
- 3.3 acres net
so' xaYel he
Soo
COURSE �� �
7F-1WA Y-------19----------- -- --- ----- -
J
PH,4SE F
�6-e acres gross
6.4 acres net
fe/sr/,p 11see/erMN AiYf/y I I, 0
PHASE FIVE.
6.5 acres gross
4.9 acres net
• I
x,w1 se
i
�-Zmf &w.Csiw of settle• s/-r••F=—;
� j� "I RLP Zone
OI QzI /tANN1Nd 6 um'7nlNc DERIiIGTId
=.b the /1 rnIM had Joel" Bu.,d of the City of Fort Collins, Colorado,
r this _ 9v of 1f—
ZI . .
Secretary of I10n009 Nd 70sifg Bout
Q . OWNERS $IGRAINE
its uderel9^4d, being the lawful sears of the Peclurty described an this $ite
Plan, de Mrdy certify that they sc-Ot W conditioet end restrictions set
forts r said $Pawl .
Stuawd at.
Sighed Data
Signed Date
SI9rd Data
S19awd De"
Signd Osto
aw
E
� W
n
DETENT/ON POND;
N
SNARfO OETENT/ON i
4.4acres gross II
3.6 acres I
� I
t 1
SITE DATA =
Es/stlnp.ZOOM,, /P and NE
Ad i,,,, B IAy/r0 iwow — 40 fen -•.
nyto/ Ate/ewer Fwr Aree— 656,304 square feet
ANTICIPATED LAND USES:
I
Off/de SO %
MenuleeNrap 219
WOMIwa/M 29 %
All dr/lc/ 410d Lord dbee hill Ae "i"A" A' for Pdases.
z
0
ONE sa ON£
,rialiI l visi on �pll; n�a�P BcIS�nPSC rG!`�
!.o n'ion SEA o� NF%- Sep 31-7-GP
L2.sign Storm /�Yr. Recurrence Interval
Computations By P/ jZ Date Z /
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
Runoff Computations
(Rational Method) PAGE e OF 14-
Dvu
Area
A
c
e(
Cs
A•c
IA•C
tc
I
On
Slope
Length
VELgn
At-
Polm
Designallon
(Acres)
(caaO
(min)
(In/hr)
(IA•c)■I•
c(c
(S)
L
(feaI)
V
fps
(hvn)
Rcmorks
0
�-. 4
0.85
1x
1
s
7
¢4,8
/ 7
9r00
Ur -Ad e✓P)otle
de e
5.7
0'
.4.2
4-3
.
¢,
frinas
r L
_
'
•
1.3
b.Z0
0.2i
o-33
Zq
t 4-
17#
330
prior e"(vfd�fPPer�e
o✓
1.5
(p .
7
W. S
' l e
3761
1" 3.r, err
S�
S
3, I
020
o.2s-
0.76
35
3.6
3.6
17
500
®
3.g
v.Bc
1
3.5
5
7
�00
/�
%
/.z
���
1
l.2
6
?
8�4
I �
p
33o r
* uLifCr
_
9
z.1
0.eq
I
z. 9
7
7
Z0.3
1
470
+ 330,
qU r
C
I
3,S
8<
I
I
3. S
�o
.7
Z4 S
7
5-oo
10
0.8
I
4-1
7
Z Ifs .3
IVSI.
4-
1. �j �o
Z
11, s
l�o lass
330
+ )360
zs-frcei'
4G
1
• 4C
.+7.1free
>..I�,livision CO%Ind a%P gIJSIneSS �Qr(S
:o•-:irion V _5 ctP T,.-h--1 rP ' /d--Yj 4n1 S. fiorSeiucl•,
)tsign SLorm 16 Yr. Rec:uirlscice Interval
:om(,nlations Oy PLR, Datc Z / Runoff Computations
(Rational Method)
PAGE 6•
Oa
Length
VEL
.P•pr-
vnoF�
e r07{'
U
_O+e
TST, INC.
Consulting Engineers
CLIENT ROGae) �/a11�CJOB NO.
�P
(/ h/I;,
PROJECT aT //Oti r.✓S /In/�.5� L CALCULATIONS FOR
2
MADE BY DATE �� �`S� CHECKED BY_DATE_ SHEET o� OF
t I l i I I i l I C I' I .L I I 1 1 t I I_ � ..1_'f.,l. r t 1 I �' t I .L_. f r '.�---.-J—r.11 �. i �...>✓'
(�i/1 L 4
i ! I �T�- 2 � I I I � i i I i��._L t.'� '„�-; i i I "} -r•- - ���'T� _i I T �"'i ` J. -I "�� t" f 1 ,
._ PE,°� I J/i/OF I -l.. ). I t ! ! ! i i� ' t ..-Z -I-�— �"�1". .;.-.-.e.- ! r •� •I- �- "�°.b..l..�..', f'a� � �"' , '.I..:^'{"°"r
! 1 i_ 1
IP,._�s,�'i.o,�/..
_i..� lot
0 1 Ili�I,�,+1 �!rtF-� ! -�-1-I -1 L I -�-�--, I- j i-',-.-- I I ,• --- I`�-r
-` f l f t i ! I I 1 I � I I I�: 1 i'l"`•""'�I i i—" !! .! I?-'`'t� _ I 1.`.� 'i`"` __����i� I I'"
i
_�-L-7
-..-_ - J._ �-�- I- ' ! 1 I_L.. ST _ I i I t-' - + _.:. i ' y_� i '- j-T'_'•ttttttt
._ _.:._.t�_ I r—.rJ...,, ! - t_.i
I 1 7? f f l i I t i r i I I ly i t +•�" I !' %' �, t. 1 I i L..� , -' y
Li
tt
• I �_� I 4 ! ! I r i' -I I I -. i i i s---, + + rf I (-r-r-I -,- I r I I
7.
1, . _�_1
L.�_ -_ I )•`'— 1 r-T'�'"` I i'-�".l- i ; r.��.»L... _t. i .I I '
i l i l i
J, ? ' t_I _"7'r. +
t_�-.--)���� • I I'_T_-'_- i I I I � i 1 I '__'__I I� j T-_"`"1`r.i'�— - � `� ` i
j- 1 I a
LJ� I I 1!
T
ILL
I_
I r . '� �'-r __ L
G050713.84
TST, INC.
Consulting Engineers
CLIENT JOB NO,
PROJECT qTF CALCULATIONS FOR
MADEBY /K<S DATE O-T- 9Z' CHECKED BY -DATE SHEET OF 2�
--
-
4-7
-T
1 L
L I
I I it I I I
1 I I I1 L
LJB SA J,
L i -La -L
F 1 11 It
III I t I
;ii
I I I t till I I 7 -7
r
A
Jill I
1 14
T I
'7
f
T�
I{ I I
T, I T
1
r—I 1:5AS IJ Aek--A-.. W04MI
it
�-A
4 -17AC I JEV 4 CA
7 1
it
17-
_._.I j
tU77
T,
F, T TFf
L
Op M Z� L/4V CF
-7 -T I—
AZ750�T'�LZI) ZTe: —7;4!
TL I
-Di 0t ime71iC ✓q,.1jZxP- t-$.O 4—e��-— dh -7-W
_Lj-,
-j-L1 L
VF-L;.
_J -L
-4 ......
4--
� -- 1. -- 77 r F.
_7 -: (k Y�
77
-J 4
G050713-84
Mr. Schleuter
July 18, 1997
Page 2
We believe that the proposed Fort Collins Wholesale Florist Site addresses and complies to all
criteria set forth by the City of Fort Collins Stormwater Utilities Division and the Drainage
Report for the Collindale Business Park. We look forward to your review and if you have any
questions or comments, please feel free to contact us.
Respectfully,
TST, INC. CONSUL-TING ENGINEERS
Keith G. Sheaffer
KGS/jts
teve F. Humann, P.E.
July 21, 1997
Mr. Glen Schleuter
City of Fort Collins — Stormwater Utilities
235 Mathews St.
Fort Collins, CO 80522
Re: Fort Collins Wholesale Florist Site
Project No.: 10-881-000
We are pleased to submit this Drainage Report and supplemental calculations for the Fort Collins
Wholesale Florist Site. We have analyzed the 1.72 acre site in conjunction with 1989 Storm
Drainage Report for the Collindale Business Park prepared by Stewart & Associates, Inc. and the
City of Fort Collins Stormwater Drainage and Design Criteria Manual. The report prepared for
the Business Park accounted for the storm runoff generated by the proposed site and sized the
detention facility to account for the runoff. In the report, Parcel 4 (the approximate proposed
site) was assumed to consist of 1.5 acres and have a runoff coefficient of 0.85. The Parcel was
assumed to sheet flow to the Northeast corner then continue flowing East along the existing
Caribou Road to existing inlets located at the intersection of Caribou and Timberline Road, then
North to the detention pond located in Parcel 10 of the Business Park. In our evaluation of the
1989 Drainage Report, the 10-year runoff and the 100-year runoff was calculated to be 5.3 cfs
and 10.5 cfs respectively. However, during our evaluation, we recalculated the runoff for the
assumed site in the 1989 Drainage Report using the City of Fort Collins SDDCM equation:
Q = CCf IA
Where Q is runoff, C is the runoff coefficient, Cf is the frequency factor, I is rainfall intensity,
and A is area in acres. We found a mathmatical error and the runoff from the site for the 10-year
and 100-year storm should have been calculated to be 5.23 cfs and 11.16 cfs respectively.
While analyzing the proposed site a composite runoff coefficient was calculated based on the
amount of impervious and landscaped area. The composite coefficient for our site was
calculated to be 0.75, this is less that the assumed 0.85 established in the 1989 Drainage Report.
The runoff was then calculated for our site. The 10-year storm runoff was calculated to be 5.42
cfs and the 100-year storm runoff was calculated to be 11.29 cfs. In comparison, the 1989
Drainage Report assumed a 1.5 acre site, where as the proposed site is 1.72 acres. Even though
our site is 0.22 acres larger, the net total acreage for the Collindale Business Park has not
changed. The composite runoff coefficient we calculated of 0.75 is less than the 0.85 coefficient
assumed in the 1989 Drainage Report for the Business Park.
Based on our calculations, the proposed runoff is within tolerance of the runoff quantities
calculated for the Business Park and no modifications of the Master Planned Facilities are
required.
TST, INC.
Consulting Engineers
748 Whalers Way — Building D
Fort Collins, CO 80525
(970) 226-0557
Metro Denier (303) 595-9103
Fax (970) 226-0204
102 Inverness Terrace East
Suite 105
Englewood, CO 80112
(303) 792-0557
Fax (303) 792-9489