HomeMy WebLinkAboutDrainage Reports - 07/27/1995 (2)O ' _, ITt"
T•
RENIINGTON COURT APARTMENTS
TO BE LOCATED ON
LOTS 19 2 & 3 OF BLOCK 123 IN THE
CITY OF FORT COLLINS, LARIMER COUNTY, COLORADO
Prepared for
Rocky Mountain C. M., Inc.
19 Old Zbwn Square
e, Fort Coiling, Colorado 80522
April 1995
Project No. GRD -166 - 95
Prepared By:
DMO MIR Engineering Associates
150 East 29th Street, Suite 225 Loveland, Colorado 80538 Telephone: (970) 663-2221
Engineering Associates
April 7, 1995
Project No. GRD - 166 - 95
Mr. Don Smith
Rocky Mountain C. M., Inc.
19 Old Town Square
Fort Collins, Colorado 80522
Dear Mr. Smith,
The enclosed report represents the results of the drainage investigation for the
proposed "Remington Court Apartments" to be located on Lots 1, 2 & 3 of Block 123
in the City of Fort Collins, Larimer County, Colorado.
This investigation was based upon the proposed site development plan; proposed
site grading plan; on -site observations; and available topographic information.
The investigation was performed in accordance with the criteria established in
the City of Fort Collins "Storm Drainage Design Criteria and Construction
Specification Standards" manual.
We sincerely appreciate the opportunity to be of service to you. If you should have
any questions, please feel free to contact this office.
Respectfully Submitted,
Dennis R. Messner, P.E.
MESSNER Engineering Associates
DRM/mkm
Enclosures
Civil and Environmental Engineering Consultants
150 E. 29th Street, Suite 225 Loveland, Colorado 80538 Telephone: (970) 663-2221
Letter of Transmittal i
Table of Contents
Scope 1
Site Description 1
"Historic" Conditions 1
Proposed Development 2
Erosion Control Measures 2
Conclusions and Recommendations 3
Vicinity Map
"Historic" Conditions Exhibit
Proposed Conditions Exhibit
Calculations
Drainage Summary
ii
The following report represents the results of a drainage investigation for a
proposed residential apartment complex to be located on Lots 1, 2 and 3 of Block
123 in the City of Fort Collins, Larimer County, Colorado. The investigation was
performed for the project contractor, Rocky Mountain C. M., Inc. The purpose of
this investigation is to determine the effects of the proposed development on the
area's existing drainage conditions and to determine the improvements, if any,
and the appropriate sizing for the proposed improvements so that it may be
incorporated with the construction of the project. The conclusions and
recommendations presented in this report are based upon the proposed site
development plan; proposed building construction plans; on -site observations; and
the available topographic information. The analysis was performed in accordance
with the City of Fort Collins "Storm Drainage Design Criteria and Construction
Standards" manual.
The site is rectangular and contains approximately 0.48 acres, exclusive of the
adjacent Alley and Street rights -of -way. The site's East-West dimension is
approximately 140 feet and its North -South dimension is 150 feet. The site abuts
the westerly right-of-way of Remington Street and the northerly right-of-way of
Magnolia Street and the easterly side of the alley that traverses Block 123. The site
is located in the OLD TOWN BASIN.
The site is presently vacant but has been previously developed. Four single-family
residences were located on the site prior to their being raised to allow for
redevelopment of the site. The ground surface has been roughly graded and a
ground cover of grasses and trees remain from the single-family lots. The
"historic" direction that the site slopes is from Southwest to Northeast. The site is
considered to be flat with slopes ranging from 0.5% to 2%. A portion of the site
currently drains onto the existing apartment building property to the North. The
major portion of the site drains easterly onto Remington Street. The run-off
generated on the adjacent Magnolia Street right-of-way flows to the West along the
street's curb and is intercepted by a storm drain inlet located at the alley in the
mid -point of the Block. The existing paved alley located along the west side of the
site has an inverted crown section. The alley is constructed with a grade break
located at the Northwest corner of the site. The flow in the alley to the North of this
point is northerly toward Olive Street. The flow in the alley to the South of this
point is southerly toward the existing storm drain inlet. The run-off from off -site
to the West of the alley is intercepted by the alley and directed toward Magnolia
Street or Olive Street. The existing storm drain located in Magnolia Street is
considered to be an 8 inch diameter pipe. The storm drain located in Olive Street is
considered to be a 12 inch diameter pipe.
1
PROPOSED DEVEL
The proposed development of the site is to consist of constructing two six-plex
apartment structures to be located on the southern third of the site. The
structures are to contain a total building "foot -print" of 8,004 square feet. A paved
parking area is to be provided for 24 vehicles and will be located between the
structures and the northerly boundary of the site. Vehicular access to the site is to
be provided from the alley at the West side of the site. The proposed site plan
indicates that the Northwest corner of the site is to remain vacant. This
investigation has considered that this corner of the site has the potential for the
construction of an additional six-plex structure.
The current City policies require that the difference between the historic rate of
run-off and the developed rate of run-off be detained onsite. The release rate is to
be no greater than the 2 Year Storm historic rate.
The City's policies normally require that the adjacent street flows be incorporated
with the onsite detention requirements. This policy applies most efficiently when
the street construction and onsite detention are developed concurrently. In this
instance, it is not physically feasible to combine the two flows since the flow
generated on the streets can not be intercepted and directed onto the site.
EROSION CONTROL MEASURES
Erosion control considerations based upon the short term activities that occur
during construction and the long term measures that are to be placed for the life
of the facility. The long term erosion control measures are the proposed methods
and materials to be used to provide surface treatments for the driveways, parking
areas, walkways and the landscaped open areas. Landscape materials and
plantings in the open areas will provide a combination of ground covers to deter
erosion.
The anticipated construction schedule should have the site grading completed
and structure foundations in -place within one (1) month after commencing
construction. The schedule for construction activities is anticipated to be: April 15
- April 25, perform site grading and access related construction; April 17 - June
30, structure construction; June 1 - June 30, construct parking and drives, and
install landscaping. The recommended short term erosion control methods to be
incorporated with the construction activities consist of the following: upon
completion of grading operations and at the time that the drainage outlet pipe is
installed a "Straw Bale Filter" is to be placed at the pipe inlet; the placement of a
"Gravel Filter" at the outlet is to occur when paving is in place before landscaping
has been installed; and a "Silt Fence" is to be placed along the eastern and
northern boundary of the site in order to control and contain mud and debris
onsite.
The proposed construction site is exempt from providing wind erosion measures
since its area is less than one acre.
2
1. The proposed development will retain the "historic" drainage patterns.
2. The site is located in the OLD TOWN BASIN. The site is not located within a
defined floodway or flood plain.
3. All development is to be performed in accordance with City of Fort Collins
criteria. A variance to the City's policies is requested for detention of
adjacent street flows due to physical impracticality.
4. Onsite detention of storm water is required by the City of Fort Collins. The
volume of run-off to be detained is estimated to be 2,640 cu. ft. The detention
volume has been determined based upon the calculated volume of run-off
from a 100 Year Storm with the site considered at the proposed conditions
being released at a controlled rate of 0.48 c.f.s.
5. The City of Fort Collins Standards for temporary erosion control measures
are to be incorporated with the construction activities.
3
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} This Exhibit has been taken from a Topographic and Boundar3
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Dated: November 10,1972
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DRAINAGE INVESTIGATION CALCULATIONS
Client:
ROCKY MOUNTAIN C. M., INC.
Project No:
GRD-166-95
Project:
REMINGTON COURT APARTMENTS
Date:
Apr. 4, 1995
Location
327_ REMINGTON STREET, FORT COL.LINS CO
By:
D.R.M.
This investigation is being performed to determine the required detention volume, discharge rates, channel
and structure sizing for the subject project site.
The site is located in the "Old Town" Basin. The site was previously fully developed and contained four (4)
single-family residences. The "Historic" run-off from the site is considered as that which occured at the time
that the site was single-family residential. The adjacent streets and alley have not been included in the "Historic"
run-off calculation because they do not drain onto the site.
RATIONAL METHOD Runoff Coefficients, "C"
Fort Collins Stone Drainage Design Criteria
Land Use Description
"C"
BuildinWRoofs
0.95
Drives and Walks(paved)
0.95
Gravel Surfaced
0.50
Undeveloped Areas
0.20
Landscaped Areas
0.20
EXISTING CONDITIONS:
Building/Roof
Drives and Walks
Gravel Surfaced Landscape
Undeveloped Open Areas
Landscaped Areas
TOTAL SITE AREA
RATIONAL METHOD
Frequency Adjustment Factors
Stone Return
Period ears
Freq. Factor
"Cf
2
1.00
5
1.00
10
1.00
100
1.25
Area=
4,060
Sq.Ft.
Area=
3,740
Sq.Ft.
Area=
0
Sq.Ft.
Area=
0
Sq.Ft.
Area=
13,200
Sq.Ft.
Area=
21,000
Sq.Ft.
Avg. C2 = ( [(0.95 x 4,060)+(0.95 x 3,740)+(0.20 x 13,200)] + 21,000) x 1.00
Avg. C2 = 0.48
Avg. C10 = ([(0.95 x 4,060)+(0.95 x 3,740)+(0.20 x 13,200)] + 21,000) x 1.00
Avg. C10 = 0.48
Avg. C100 = ([(0.95 x 4,060)+(0.95 x 3,740)+(0.20 x 13,200)] + 21,000) x 1.25
Avg. C100 = 0.60
0.48 Acres
Page 1 of 4
DRAINAGE INVESTIGATION CALCULATIONS
Client:
ROCKY MOUNTAIN C. M., INC.
Project No:
GRD-166-95
Project:
REMINGTON COURT APARTMENTS
Date:
Apr. 4, 1995
Location:
327 REMINGTON STREET, FORT COLLINS CO
By.
D.R.M.
EXISTING CONDITIONS: (conL)
Time of Concentration
Consider sheet flow across site from Southwest to Northeast
L = 200 ft. Elev. Difference 91.8 - 89.6 = 2.20 ft.
Slope, S = 1.10 %
T = 1.87(1.1-CCf)gL+(SAl/3)=1.87(1.1-(0.48xl.00))4200+(1.1A1/3) = 15.89 Minutes
Tc = L / 180 + 10 for urbanized condition with longest flow path considered
Length, L = 235 ft. Tc = 235 / 180 + 10 = 11.31 minutes
USE Tc = 15 minutes
Rainfall Intensities based upon 10 minute Time of Concentration:
I2 = 2.10 in./hr.
I10 = 3.90 in./hr. I100 = 6.00 in./hr.
Determine Runoff from site under "Historic" conditions:
Q = CIACf
PROPOSED CONDITIONS:
Building/Roof
Parting, Drives and Walks
Gravel Surfaced Landscape
Undeveloped Open Areas
Landscaped Areas
TOTAL SITE AREA
Q2 = 0.48 x 2.10 x 0.48 x 1.00 = 0.48 c.f.s.
Q10 = 0.48 x 3.90 x 0.48 x 1.00 = 0.90 c.f.s.
Q100 = 0.48 x 6.00 x 0.48 x 1.25 = 1.73 c.f.s.
Area=
8,004
Sq.Ft.
Area=
7,320
Sq.Ft.
Area=
0
Sq.R.
Area=
0
Sq.Ft.
Area=
5,676
Sq.Ft.
Area=
21,000
1 Sq.FL
(includes "Future" 6-plex)
0.48 Acres
Page 2 of 4
DRAINAGE INVESTIGATION CALCULATIONS
Client:
ROCKY MOUNTAIN C. M., INC.
Project No:
GRD-166-95
Project:
REMINGTON COURT APARTMENTS
Date:
Apr. 4, 1995
Location:
327 REMINGTON STREET, FORT COLLINS CO
By.
D.R.M.
PROPOSED CONDITIONS: (cunt.)
Avg. C = [(0.90 x 5,187)+(0.90 x 25,668)+(0.50 x 0)+(0.35 x 9,000)+(0.15 x 32,655)] + 72,510
Avg. "C" = 0.75
Flow path will not change significantly from Existing Condition therefore, USE Tc = 15 minutes
Determine Peak Rate of Run-off at Proposed Condition:
Q2 = 0.75 x 2.10 x 0.48 x 1.00 = 0.76 c.f.s.
Q10 = 0.75 x 3.90 x 0.48 x 1.00 = 1.40 c.f.s.
Q100 = 0.75 x 6.00 x 0.48 x 1.25 = 2.70 c.f.s.
DETENTION VOLUME CALCULATION FOR PROPOSED SITE CONDITIONS
From previous calculations QRelease = Q2 (Existing Conditions) = 0.48 c.f.s.
At Q100 Proposed = 0.75 x I x 0.48 x 1.25 = 0.45 x I (inJhr.)
Time
min.
Rainfall Int., I
(in./hr.
Q100 Prop.
c.f.s.
Vol. @ Q100
cu.ft(c.f.s.)
Q Rel. @ 2 Yr.
Vol. Rel.
cu.ft
Vol. WE
cu.ft
10
7.25
3.26
1956
0.48
288
1668
IS
6.00
2.70
2,430
0.48
432
1998
20
5.20
2.34
2,808
0.48
576
2,232
25
4.60
2.07
3.105
0.48
720
2.385
30
1 4.15
1.87
3 366
0.48
864
2,502
40
1 3.50
1.58
3,792
0.48
1,152
2,640
50
3.00
1.35
4 050
0.48
1440
2,610
60
2.60
1.17
4 212
0.48
1728
2.484
70
2.30
1.04
4,368
0.48
2 016
2.352
80
2.05
0.92
4,416
0.48
2,304
2.112
90
1.85
0.83
4,482
0.48
2,592
1890
100
1.70
0.77
4,620
0.48
2,880
1 740
110
1.55
0.70
4,620
0.48
3,168
1452
120 1
1.45
0.65
4,680
0.48 1
3 456
1,224
Therefore, a minimum of 2,640 cu. ft. of Detention Storage Volume is desired for the site.
Page 3 of 4
DRAINAGE INVESTIGATION CALCULATIONS
Client: ROCKY MOUNTAIN C. M., INC. Project No: GRD-166-95
Project: REMINGTON COURT APARTMENTS Date: Apr. 4, 1995
Location 327 REMINGTON STREET, FORT COLLINS CO By. D.R.M.
PROPOSED CONDITIONS: (cont.)
DETENTION VOLUME CALCULATION FOR PROPOSED SITE CONDITIONS (cont.)
Elevation of Low Point = 4989.25
Design High Water Elev. = 4989.25 + 1.0 = 4990.25
DETENTION OUTLET CONTROL DETERMINATION:
Determine Orifice Opening Area for Discharge at Q2:
Orifice Equation: Q = CA 42gh
h, Depth = 1.00 ft.
Q Release = 0.48 c.f.s. C = 0.65
A = Q / (C42gh) = 0.48 / [0.65 4(2 z 32.2 z 1.01= 0.09 sq,ft.
With Round Opening A = mA2 r = 4A/x = 4 0.14/7c = 0.17 ft.
radius,r = 2.04 in.
THEREFORE, USE 4" DIA. PIPE FOR OUTLET CONTROL.
Check Detention Volume of Site
ELEV.
ELEV. DIFF.
AREA
AVG. AREA
VOL.
I VOL.
Ft
S . Ft
(Sq. Ft
Cu. FL
Cu. Ft
89.25
0.25
25.00
570.00
142.50
142.50
89.50
1115.00
0.50
2697.50
1348.75
1491.25
90.00
4280.00
0.25
4672.50
1168.13
2659.38
90.25
5065.00
Required Volume @ 100 Year Storm = 2,640 cu.ft.
Therefore, Elev. @ Vol 100 = 90.25 t
Page 4 of 4
STORM WATER DETENTION SUDEM ARY
SITE DRAINS TO "OLD TOWN' BASIN
NET SITE AREA = 21,000 SQ.FT. = 0.48 ACRES t
HISTORIC "C" = 0.48
DEVELOPED "C" = 0.75
CRITERIA BASED DETENTION VOLUME = 2,640 cu.ft.
PLAN DETENTION VOLUME = 2,659 cu.ft.
MAXIMUM DEPTH OF DETAINED WATER =1.0 ft.
PEAK DISCHARGE, Q = 0.42t c.fs.
RAINFALL PERFORMANCE STANDARD EVALUATION
PROJECT:eMIN�a7on CbuRT AP���vnF�lrs STANDARD FORM A
COMPLETED BY: l�rruN�s !✓I�LESS,yDATE: r.l I
DEVELOPED
ERODIBILITY-
Asb
Lsb
Ssb
Lb
Sb
PS
SUBBAgIN
ZONE
(ac)
(ft)
($)
(feet)
M
M
Mode.aul
6 .4t
I1'S
1,4
? 7, S-
MARCH 1991 8-14 DESIGN CRITERIA
EFFECTIVENESS CALCULATIONS
i
PROJECT: /1 STANDARD FORM B
REM/.vGTDN CouRT r7i°�9/pj/nsyjS
COMPLETED BY:�-.r�{,s ac. eA . DATE: -4p�,
Erosion Control C-Factor P-Factor
Method Value Value Comment
►ti �Jo� I ,DD .OD 6i^&4c4 (o F
I„le,- F%tiery—
MAJOR PS SUB AREA
BASIN ($) BASIN (AC) CALCULATIONS
77.5
0,�8'
/3a�e So,/ = 3,34 u,. t Ayj
W4d 3ox /,00) A(D,/� x6,0/)]_0,1e$
775 oak
�.I
MARCH 1991 ... 8-15 DESIGN CRITERIA
SEQUENCE
PROJECT:
/&441rvA7hAt
GvulPr A4AAAon6VrS
STANDARD FORM C
SEQUENCE
FOR 19 9S
ONLY COMPLETED BYt ✓E.yv f%J a E+�
DATE:.74 /791�
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.
YEAR
MONTH
q
I Atop I MY I J.A
I
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughening
Perimeter Harrier A //�
Additional Barriers /
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters .an
Straw Barriers Noonan=
Silt Fence Barriers �..�0000o
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving IIIIIIIIIII11=6
Other Fs
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettinge/Mate/Blankets
other
S/TE L653 THAN
STRUCTURESt INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
MARCH 1991 B-16 DESIGN CRITERIA
Engineering Associates
April 7, 1995
Project No. GRD-166-95
Mr. Glen D. Schlueter
Stormwater Utility
City of Fort Collins
235 Mathews
R O. Box 580
Fort Collins, Colorado 80522 - 0580
Re: Remington Court Apartments, 327 Remington Street, Fort Collins, Colorado
Dear Mr. Schlueter,
The subject project's estimated erosion control security amount has been .
determined to be the minimum amount required by the City of Fort Collins.
Therefore, the amount of $1,000.00 should be included for the erosion control
guarantee along with any other surety requirements that are to be a part of the
City's "Developer's Agreement."
If you should have any questions or desire additional information, please feel free .
to contact this office.
Respectfully Submitted,
MESSNER Engineering Associates
Dennis R. Messner, P.E.
DRM/mkm
�/°r�, /0, /Wrs-
cc: Mr. Don Smith, Rocky Mountain C. M., Inc.
Civil and Environmental Engineering Consultants
150 E. 29th Street, Suite 225 Loveland, Colorado 80538 Telephone: (970) 663-2221
GENERAL NOTES
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nt
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141
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LEGEND
-- Eo --
Existing
Contour
— 80
Proposed
Contour
—O—
— Existing
Menhole
--�--
Existing
Storm Drain Inlet
Proposed
Storm Drain Pipe
l
Exlsling
Edge of Asphalt
TOTE
1. The perimeter of the proposed paved parking areas is to be bordered by a
raised Curb Or curb and gutter.
3. All roof drainage Is to be directed to the parking Iotestorm water detention
area.
ear01 Concentration
IdenllHer �v
/ 0
2.14
Drainage Area
(acres)
10 40 SO
3.0
6.6
W
Peek Flow, O,
100 Year Storm (c.l.e.) 0 PO 60
If
Peak Flow, 0,
® 2 Year
Storm fc,l SCALE' 1 No $V
"145
Existed Spot
Elevation
90.95
Proposed Spot
Elevation
® Pavement Surface 0
9155 T.o.O.
Proposed Spot
Elevation
® TOP 01 Curb \m--90"
91.5 T.c W
Proposed Spot
Elevation
® Top of Welk
1'-0
March ExiS Ftoline M—rXfinp CUT
ed�6' Mln.
per
SECTION BIB
(Nottoscale)
Match Existing
on
Op eI.eroo
6' dieoutlet pipe Orifice
om Detention Area
A
BARED CURB OPENING" DETAIL
(Not To
elgLY WA= O61WI]W2 91MYB4
EITE DRAINS N OLD'IOWNBA91N
NLTSM Al1EA 121,000 K, FIT .048 ACR x
HIMMC -C. - 048
DEVELOPED-C-.075
CRITERIA BABBD DZRNTION VOLUME.Z4WD A.
III DP'I'F.MION VOLU.V I yet aft. at N.ill L=90.25
M UNDFVI'6OPI)fA1NEDWAMR.1.0A a1HWL.-90.25
PFAR DISCHARGE. Q . Olar [ L.
bond, onrm Plate of e r oar Meet Piw win
0,1 Op "W g i1 a Me Iranian d Me 0.q
C RI PLATE DMENYYIB
0.t
Area
P.1
Orlliw
(0.) Dpsolrlp
Pleb
inakmn
IT
a- 4- p e
1I4
ORIFICE PLATE DETAIL
jf oRla-Sca ss
H W l.. bl.25 $wdewilk
89 75 r Top of Vi
an can Nx MT Mai we