HomeMy WebLinkAboutDrainage Reports - 08/06/20011
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ReportFs Ked
MOPMTY OF
ate Z
FORT COUMS TUMMS
FINAL DRAINAGE PLAN
FOR
PARK SOUTH COMMERCIAL PLAZA SUBDIVISION, THIRD FILING
McCLELLANDS / MAIL CREEK BASIN
PREPARED FOR BELLISIMO CONSTRUCTION INC.
DUNE 20, 2001
PREPARED BY
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
TEL. 970-482-9331
FAX. 970-482-9382
12o N
JUN 2 6 �pp�
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' TABLE OF CONTENTS
' 1 Vicinity Map
2-3
Teat of Report
8-9
Runoff
Calculations
'
10
Drainage Table
11-12
Retention Required &
'
Retention Volume Table
13-16
Erosion Control Calculations
17-20
Water Quality Volume Calculations
21-23
Swale Cross Section Calculations
'
24-25
Rip Rap Calculations
26-31
Revised Retention Pond Pump Station
Pocket
Grading, Drainage & Erosion Control
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VICINITY MAP
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STEWART SSOCIATE
8� S
' June 20, 2001 Consulting Engineers and Surveyors
Mr. Basil Harridan
Stormwater Utilities
City of Fort Collins
'
P.O. Box 580
Fort
Collins, CO 80522-0580
' Dear Basil,
The following is the Final Drainage Report for Park South Commercial Plaza Subdivision,
Third Filing, Fort Collins, Colorado. The site contains 4.4721 acres and is located in the
McClellands / Mail Creek Drainage Basin. The site is bounded on the West by Manhattan Avenue,
on the North by the access road to the Carmike Theatre, on the East by the Carmike Theatre site and
on the South by Park South 2nd Filing PUD which is a partially developed apartment complex. The
site is zoned C-Commercial.
The site slopes from Northwest to Southeast at an approximate slope of 1.5%. Part of the
existing retention pond for all of Park South Commercial Plaza is on Lot 3. The channel from the
' North side of the access road is in Lot 2. There is a stockpile of dirt on Lot 3 that was excavated
from the retention pond.
' The proposed development is a mini storage complex that has 13 buildings and two office
buildings. The site will be graded to carry the stormwater runoff to the existing retention pond in the
inverted crown driveways. The retention pond will have two times the volume of the difference
between the 100 year developed runoff rate and the two-year historic runoff rate.
The site is considered one historic drainage basin. The site will sheet flow from Manhattan
' Drive to the existing drainage channel and to the existing retention pond. The two year historic rate
of runoff is 1.53 c.f.s. and the 100 year historic runoff rate is 6.84 c.f.s.
' The developed site is divided into three sub -basins. D.B. I is the North 1.57 acres of the site
and its runoff enters at the North end of the retention pond. D.B. H is the middle of the site and
contains 1.69 acres. D.B. H will flow through D.B. III to the retention pond. D.B. III is the South
' 1.21 acres of the site. Its runoff enters the existing retention pond at the Southeast corner of the site.
The existing retention pond was enlarged in May of 1998 to accommodate the runoff from
' Lots 2-B (Autawash) and this site which is Lots 1, 2 and 3 of the Park South Commercial Plaza
Subdivision, Third Filing. The volume of retention for each of the lots was based on a runoff
' coefficient of 0.75. The runoff coefficient for this site is 0.75. The runoff from this site was
calculated with the revised rainfall amounts.
' The high water line of the retention pond, after it was enlarged in May 1998, is 40.76. Due
to the Rainfall Intensity -Duration -Frequency Curve being revised in 1999 and that the volume
available for detention storage was calculated using the average area of two contours rather than the
' James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
970/482-9331 • Fax 970/482-9382
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equation V = 1/3 d (A+B+ vrAB), I have recalculated the volume of runoff from Lots 2-13, 1, 2 and
3 that will be retained and the volume available in the enlarged detention pond. To provide the
additional volume we have raised the high waterline from 40.76 to 41.00. The new high waterline
provides 1.00 foot of free board for the theatre and 3.00 feet of free board for the lowest storage
building. There will be some additional material placed on the berm along the South and East lines
of the Carmike Theatre portion of the retention pond to provide a minimum of 0.50 feet of free board.
EROSION CONTROL:
The site is in the moderate rainfall erodibility zone and in the low wind erodibility zone. A
silt fence will be constructed along the South and East and North sides of the site. A straw bale dike
will be placed at the North end of the existing retention pond and at the Southwest corner of the
existing retention pond. A soil sealant will be applied to a part of the site.
The existing retention pond will provide the extended detention requirements for a forty hour
period for water quality treatment. The total Water Quality Volume for Park South Commercial Plaza
Subdivision Third Filing and Carmike Theatre is 13,643 cubic feet. The existing pump station is being
retrofitted by Falcon Supply Company, Inc. to provide discharge down to elevation 5036.70 and
leave the 13,643 cubic feet of extended detention in the pond for 40 hours.
The grading, drainage and erosion control plan is enclosed as a part of this report. The
historic and developed runoff calculations are also a part of this report.
This drainage report and the design of the drainage system are in compliance with the City
of Fort Collins Storm Drainage specifications and criteria. If you have questions regarding this
report, please call.
Sincerely,
..S.Richard A. Rutherford, P.E. & S.
RAR/meh
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
1 STEWART&ASSOCIATES
Consulting Engineers and Surveyors
1 By: TEA /2. Date: 1 �♦? o� Tom Client: R E i L► s 1 M n Cp Aj m T N c. Sheet No. J of_
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STEWART$,LSSOCIATES 10 S. LD1RUM,FAX FORT COLLINS, CO 80521
PH. 48Consulting Engineers and Surveyors
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103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: 2 !} 12 Date: 4-1 � t o t Client: B e z- L is i M n Gn n.r T Sheet No. J2__ of
Project: E Pi ,4 % Z, nrs Z-13 TPeoua)a 3—D OvTN C0MMF,eC/4L PLA74
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CONSTRUCTION SEQUENCE
PROJECT: KEPLAT Lori 3—A THBevc,s 3-1>, %�.42K-OvTiIGoMMEaGAG STANDARD FORM C
Pa^zAIZ,va F,e.lAlA-
SEQuENcE. FOR Z ool ONLY COMPLETED BY: 2.4t? DATE: oEc.zo,a000
r^?
Indicate by use of a bar line or symbols when erosion control measures will be installed
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
ZOO l YEAR I I
MONTH I T I F I M IA
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
A
I I I I I
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
M T T
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MAINTAINED BY
APPROVED BY CITY OF FORT COLLINS ON
' JAv'LA?': 1991 8-20 DESIGN CRITERIA
MAINTAINED BY
APPROVED BY CITY OF FORT COLLINS ON
' JAv'LA?': 1991 8-20 DESIGN CRITERIA
04)
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RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------------------------------------------------------
PROJECT: izC-PI-AT �-07I 3-4 TNeou,k 3-D, F�A SkJourY STANDARD FORM A
G6M1ACfeC/,4L P[.AZA ZND• lF7/1-/AJC
COMPLETED BY: 2 A p— DATE: p g Z�
I---------------------------------------------------------------------
IDEVELOPEDIERODIBILITYI Asb I Lsb• I Ssb Lb I Sb I PS
ISUBBASIN I ZONE I (ac) 1 (ft) I (;) .`(feet) 1 (0) 1 (o)
---------------- ------- I ------ ;1------- I ------- I ------- I-------
Irorac- MoverLRTEI ¢.4--7AGI ZZS 1 /.64%1 ZZs' I C,v-7oI 79.7
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iDI/SF-A:1989
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EFFECTIVENESS CALCULATIONS
PROJECT: Q C pk_,4T La. I s ?-A T1v2ovc y 3-D, OR zkSovTH Go h h• PcAPTANDARD FORM B
SEGO .emu Fi L i a
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COMPLETED BY: ,e 4 DATE: D Ec•Z o. Z can
Erosion Control C-Factor P-Factor
Method Value Value Comment
BAoc-6,eouup /,00 /-00 3zac.
SIL-r *jr_06 O. So
S-rP,AwSALES /• 60 o,80
D ,ey&AAJD 624X1 0.07 /.00 0 7Lac.
Arpt- 4LT 4Co/jc. 0.01 boo 0./4Ac.
.S olc. SEALA AJT OD Z•Z9 4c
MAJOR
PS
SUB
AREA
BASIN
BASIN
(Ac)
CALCULATIONS
Mr.0-9
MR��te�
AV 7B%
774
T2ac�
T 4il�c
wrD C zC.06X /.32�+ (62-1 Z9� (0,7x 6-7L) (0•o�x 0• i4�
- /'3L t o. -7 �- p, Soo- f 0,cb/4
L(J t D v SO X L7. SD = O. 4-O
S3 x 0.4, `(/60 = 766.8
O /C
$TEWART&ASSOCIATE$
' Consulting Engineers and Surveyors
'
December 20, 2000
Mr. Basil Harridan
'
Stormwater Utilities
City of Fort Collins
P.O. Box 580
'
Fort Collins, CO 80522-0580
Dear Basil,
The following is the cost of erosion control for Replat of Lots C-A Through C-D, Park South
Commercial Plaza, Second Filing.
1. 1120 Feet of Silt Fence @ $3.00 / Ft. $ 3,360.00
' 2. 2 Straw Bale Dikes @ $100 $ 200.00
3. Reseeding Site: 4.47 Acres @ $650 / Acre $ 2,906.00
Collateral = 1.5 X $3560 = $5,340
' If you have any questions regarding this cost estimate, please call.
' Sincerely,
IJA•
`� Fes'•, �.
. z
' Richard A. Rutherford, P.E. & L.S. _ 5028
RAR/meh *=
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' James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
970/482-9331 9 Fax 970/482-9382
STEWART&ASSOCIATES 10 S. ME 3D1RUM, FAX FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors
' By: R-A .2 . Date: 4 f-0 L Client: 13,� / t 1 C / A4 0 C o n, s r Sheet No. 7 of_
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82
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1 By: R A k Date: lylgX Z Zovi Client: _- B E t..t_isi m o Sheet No. 9 of_
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DRAINAGE CRITERIA MANUAL (V. 3)
STORMWATER QUALITY MANAGEMENT
1
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9-1-1992
UDFCD
51
Note: Watershed inches of runoff shall apply to the
entire watershed tributary to the BMP Facility.
FIGURE 5-1. WATER QUALITY CAPTURE VOLUME (WQCV)
_EX-_55_M_E—D_DETENTION POND HIGH WATER LINE
3t43.0:,=.,REQ;::VOLUME :]
CONTOUR
AREA
(sq.ft.)
AVERAGE AREA
(sq.ft.)
INTERVAL
VOLUME (cu.ft.)
CUMMULATIVE
VOLUME (cuft)
HIGH WATER
LINE (ft.
35.0
1.0)
27,.:
4 5
15 .4
36.0
6,653.0
36.7
.... ................ ..
....
... ..17,2175
16,010 Tp:
.......... ... . .......
.. . .....
37.0
27,782.0
.... ....... .... ..
g
39A29:
...........
.............. .....
38.0
51,077.0
.. . . ........
114277
57,32350
57,209.
39.0
63,569.0
.. ..... ...
.68�539�O�
.......... ..
.. .........
40.0
73,509.0
. .. .... .....
... . .. ..... 8:
26.19514
41.01
85,020.01
1
NOTES:
1. FOR THE FIRST CONTOUR VOLUME A CONIC SHAPE WAS ASSUMED
VOL. = 1/3 (AREA ABOVE) (DIFFERENCE IN COUNTOUR ELEV.)
2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2)
VOL. = DEPTH/3 (A +(AB) ^.5 + B) FOR: Uniform Sides sec.(9.2)
3. HWL= (VOL.REQ. —VOL. LOW CUML)*3/(AREA LOW+AREA HIGH+(Iow area*high area) ^.5)
....HWLP0NQ$
ORIFICE SIZING
ORIGINAL DESIGN DATAZ
24.00 = Allowable Des. Re[se Rate(cfs) NOTE: 1. VERT. PLATES WILL BE PLACED
0.60 = Flowline Orifice evation(ft) AT PIPE FLOWILINE
V,65 = Orifice Coeffi' nt (Ccl)
16.tA = Available DO(jing Head(ft)
VERT. CIFWULAR PLATE
168 23ut et.
. ... .......
Circular ra s inches
x
'Ac'tua1J4Vdraui1i Dnvina:.Head
VEAT. SQUARE PokTE
167 86 ;Outlet Areas !inches
penin inches
............
461"(6 Head ff
=4 y
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STEWART&&SSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: R,4k Date: Ape. z,zool Client: BELL/s/Mo Govfr. =.mac. Sheet No. Hof_
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PH. 482-9331 FAX 482-9382
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FHLLUN SUPPLY 1NL N0.360 P.1
FALCON SUPPLY COMPANY, INC.
P.O. BO�( 469 • NIWOT, CO 80544-0469
FAX (303) 652-3460 • TELEPHONE (303) 499-7131
FACSIMILE TRANSMISSION
'
TO:
Stewart
ATTN:
Mr. Dick
FROM:
Marion h
DATE:
May 17, ;
SUBJECT:
Park Soi
'
NUMBER OF PAGES INCI
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Dear Dick,
1 have come up with a pro
retention time with autom
solution requires a "one
one control relay and one
switch is used to activate
delay relay with timed clo
reset for the "one shot" c
to it. This re -sets the cycl
relay to operate. The timi
initiates the repeat cycle t
buffer should the float sw
no check valves in the pip
differential between "on"
change could cause boun
the level control section c
When the RCT is activate
low level off float switch
the level control circuitry
determined level, even th
level of LS1. The1imer w
switches until such time ,
Associates
Commercial Plaza Pump Station
DING COVER SHEET: /
iosed method of providing the 40 hour
tic pump out after the necessary delay. The
iot" repeat cycle timer, one time delay relay,
formally closed float switch. The float
he control relay and an adjustable time
ing contact. The control relay acts as a
cle timer to cause a momentary power blip
. The float will also cause the time delay
I closing contact acts as the "trigger" which
Tier. The timed closing contact provides a
:ch bounce. (This is a possibility if there are
ng. The float switch will have minimal
nd "off" points. Even a very small level
;ing.) The "one shot" cycle timer controls
the panel.
It will open a contact wired in series to the
51). This will remove control power from
nd shut down both pumps at the pre-
igh there is still water in the well above the
then prevent pump operation by the level
one of two events occur:
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Dayton Operating Instructions and Parts Manual
947NU-jb1dG P.43/w
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Dayton' Time
Delay Relay
Start 1-Shok....................... .............. One -Shot At end of time delay period, output
Switch
:ti .................................... Off Delay corffaets will transfer back to their
+ Intervaal...... ............................ .. Interval original position;, and timer Is ready
s' a for a new cycle.
D.O.M................................ _.... On Delay �9 On
11
�s Read tthm the operation and application Vo a Off
sections of this manual t0 determine the Start On n
t Inpuc► — proper, function selection for your Switch Off
Figum 2 application. To insure proper operation, Load Off
Operation the inlsut power should be disconnected Off TJ im'
before changing functions. Figure S
lng
RANGE SELECTION On WIIIay- Upon application of voltage Repeat Cycle: Upon application of
There are five different timing ranges to input terminals` time delay period voltage to the input terminals, the
from which to choose_ The 3 digit begifd. At end of time delay period, •off" delay is initiated. At the and of
switch selects the amount of time outpui contacts transfer, either the 'off" preset time, the contacts
to each range, connecting or disconnecting load, transfer from the 'off' to the 'On'
Reset is accomplished by removing position and the'on' delay starts.
Input voltage. At the end of the 'on' preset time the
contacts transfer from the 'on' to the
Voltage Cif ", 'off' position and a new cycle begins.
1St 0.05 to 9.99 seconds Load On Timl,tg The 'on' and *off" cycles will continue
2nd 0.1 to 99.9 seconds I Offto alternate until input voltage Is
3rd 1 to 999 seconds 141111,,ri3 removed.
4th 0.1 I to to 99,9 minutes Int `vat Upon application of voltage Voltage to
on
Sth 999 minutes to Input terminals, output contacts Load Off
On Tine
I_ The input power should be discon- transfer and time delay period begins. on
nected when setting the time interval At end,of time delay period, contacts Off
to Insure proper operation. transfer bads, either connecting or PFFM 6 Off Time
2. Determine the time interval need for discongecting load. Reset is accomp-
your application. (EX: 20.5 seconds) lisped by removing input votage. One Shot.• Voltage is to be applied
to input terminate at all times that this
3. Position the range select switch to i • On g Votage r-'--�, product is In use Upon momentary or
the lowest range that meets your t Off maintained dosure of control switch,
needs. (EX: 99.9) t0 On output contacts transfer and time delay
I Timing period begins. At end of time delay
4 Set the three digit time select seghne 14 period, output contacts will transfer
switches to the desired time.
(EX: 205)_ Off Delay; Voltage is to be applied to tide to their original positions and
timer is ready for a new cycle.
FUNCTION SELECTION Input 'terminals at all times that this On
There are five different functions from produi.t is in use. Upon closure of Voha9e Ole
which to choose. control hwitch, output contacts transfer. Start On
Once control switch is 'opened." time Svratch On
FUNCTION SELECTIONS delay deriod begins, control switch
Repeat ............. ... Repeat cycle closures prior to end of time delay toad On
(50% fixed duty cycle) period Oidil immediately reset timer. Offftura
2 Tmhing
i
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TOTAL P.03
1
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EXERCISE
'•- 3 +
10
7 TORt 2
RUN TIMER
SET sE
c.
;2 2n
;
PUMP 2
TC2
r2T2 4. PUMP 3 +
N0.2
N
EXERCISE
RUN TIMER
2T3 7.1 F.L.A.
SEA MODC B:
0-;30 66EE
+
LA
7 T017 2
DELAY
REETLAY
460 VOLT
A'
3 SEC.
TR-1.5KVA
CR1 12
CR1
PUHP NO.1
CALL FOR
NO.2
FOR
PUMP NO,1
10 OFF A
I-p�?
-0 SVA
TS1
PUMP NO.2
AUTO 313 -;- 14 4M
^511MY1—
K:TO i
PUMP NO.2
CR2 G RUNNING
B 5
BE CONNECTED TD EARTH GROUND. 6.) THIS CIRCUIT DIAGRAM IS DRAM WITH bQ ELECTRICAL POWER,
THAT It WITH ALL COMPONENTS IN DE —ENERGIZED STATE.
7.) ALL LSENSING SNITCHES ARE SHOWN VAIN NO LIpUID IN TANK . n 7 us w
RAIN DISCpN<iEt;x(O;:OEVICE. NI111• SHORT OR WEL
ELECTRICAI:;BCY,. - B.) MOTOR PROTECTOR CONTACTS (MP) ARE NORMALLY OPEN. HOWEVER. pUpLEX
CONTACTS', W.� ALI, ypTQRS. THEY ARE CLOSED WHEN UNIT IS SWITCHED 'ON CONTACTS WALL
CH; ]ijjSE Ij S MUST'. BE ' FAIL 'OPEN' WHEN UNIT SENSES EITHER MAGNCTIC CURRENT, THERMAL 2-4,70 Ll
xt 1 CURREAJT OVERLOADS, OR WREN UNIT IS TURNED 'OFC.
%.fo ENCLOSURE FOR I DWI~.
! A:s C%sip `i' •;1 .: I FALCON SU
+I..
nAl
MAY.17.2001 2:47PM
FALCON SUPPLY INC
,1.
p 1)
' NO.360 P.6
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.- EAISRNG CONTOURS
PR SED CONTOURS
♦ b.v
EKISDNG SPOT ELEV
• 5/.A
PROPOSED SPOT EIEV.
------_
B61N LINES
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