HomeMy WebLinkAboutDrainage Reports - 02/26/1991DRAINAGE REPORT
PROPOSED SPRING CREEK COUNTRY DAY SCHOOL
REMINGTON STREET AND SPRING PARK DRIVE
FORT COLLINS, COLORADO
FOR
LEE FETTERS
CDS Engineering Corporation
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DRAINAGE REPORT
PROPOSED SPRING CREEK COUNTRY DAY SCHOOL
REMINGTON STREET AND SPRING PARK DRIVE
FORT COLLINS, COLORADO
FOR
LEE FETTERS
Prepared by
CDS ENGINEERING CORPORATION
100 West 29th Street
Loveland, Colorado 80538
(303) 667-8010
CDS Project No. 7044
February, 1991
Prepared by:
��2 U.. cl-tl-
Stephen W. Rogers,
M.S., E.I.T.
' February 7, 1991
Attn: Mr. Glenn Schlueter
' City of Fort Collins
Storm Water Utility Services
235 Matthews
' P.O. Box 580
Fort Collins, CO 80522-0580
RE: Drainage Report - Spring Creek Country Day School
CDS Project No. 7044
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Dear Mr. Schlueter:
Attached is the drainage report for the proposed Spring
Creek Country Day School located in Fort Collins, Colorado,
between Spring Park Drive, Remington Street and Matthews
Street. The owner of the site is Mr. Lee Fetters.
Please note that the grading and site plan have been
previously accomplished by Dana W. Lockwood, Architect.
This drainage report utilizes information on those design
plans and no changes have been made to the grading or site
plan by this office.
If you have any questions regarding this report and/or
our analysis, please contact our office.
Sincerely,_
CDS ENGINEERING CORPORATION
c� UJY
Stephen W. Rogers,
M.S., E.I.T.
Reviewed by:
Z
P.E.
cc: Mr. Lee Fetters
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100 West 29th Street • Loveland, CO 80538 • (303) 667-8010 • (800) 933-8011
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INTRODUCTION
This drainage report is made pursuant to criteria set
forth by the City of Fort Collins in accordance with "Storm
Drainage Design Criteria and Construction Standards", dated
May, 1984. Hydrologic and hydraulic analysis have been made
to best represent actual existing and proposed drainage
conditions in the area.
The grading plan for this site has been previously
completed by Dana W. Lockwood, Architect. This report
intends to verify the grading and incorporation of drainage
and flood control structures to adequately meet minimum
standards for drainage and flood control purposes.
GENERAL SITE LOCATION AND DEVELOPMENT DESCRIPTION /?00keMtjto,t
The site of the proposed project lies South of Spring
Park Drive between Remington and Matthews Streets, in the
City of Fort Collins, County of Larimer, Colorado (See
Location Map). More specifically, the site is situated in
Tract 2 of the Replat of Block 2, and Lots 1 to 7 inclusive
of Block 1, St. Vrain Subdivision. The site comprises 1.34
acres, more or less.
The proposed development of the site consists of the
construction of a 7244 square foot building, approximately
18,025 square feet of asphaltic pavement parking area
installation, and general landscaping. Off -site
improvements include approximately 600 linear feet of 5'
PVH
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' sidewalk installation and driveway access through existing
curb and gutter.
EXISTING DRAINAGE BASIN DESCRIPTION
In general, the site has little relief. The average
slope across the site is approximately nine -tenths of one
'
(.9) percent. Existing elevations range from 49795 to 4978
feet (see Exhibit A - Grading and Drainage Plan).
'
Flows typically travel from South to North across the
site as sheet flow. It does not appear that flows would be
concentrated at any point on the site.
'
The areas to the South and West of the site appear to
be much higher and have much larger slopes than the subject
'
site, defined by a identifiable grade break. The areato the
East is relatively flat and slopes North/Northeast.
North of the Spring
site and Park Drive is Spring Creek
'
which flows from the West to the East. This creek is a
major off -site conveyance channel and has flooded
'
significantly in the past. The 100-year frequency flood
plain and floodway boundaries are shown on Exhibit A. The
'
existing 100-year computed water surface elevation (CWSEL)
'
is estimated as 4978 feet. These values have been confirmed
with FEMA floodplain information. The first floor of the
'
proposed building has been set at 4980.88 feet,
approximately 2.88 feet above the 100-year CWSEL. The
proposed building encroaches on the 100-year floodplain
boundary slightly but is well out of the 100-year floodway
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boundary. We understand that the issue of floodplain
.'
encroachment has previously been addressed and has been
resolved by the owner, Mr. Lee Fetters and will not be
'
discussed further herein.
The adjacent off -site basin is defined by College
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to the
Avenue West, Rutgers Avenue to the South, Matthews
Street to the East and Spring Creek to the North (See Basin
Map). This off -site basin was determined to be
'
approximately 8.88 acres in extent. Much of the off -site
flows are expected to be conveyed down the maiorarterial—
'
street's curb and gutter. Due to the slope and width of
College Avenue, a considerable amount of flow is estimated
to be conveyed to Spring Park Drive. However, high points
'
in College Avenue exist at East Stuart Street and Rutgers
Avenue thus limiting the contributing drainage area for
College Avenue flows.
HYDROLOGIC ANALYSIS
' The rational method as outlined in the "Storm Drainage
Design Criteria and Construction Standards" was utilized to
' estimate on -site and off -site flows for both the existing
and proposed conditions. Calculations are included in
Appendix A.
For the off -site basin, a runoff coefficient ('C'
value) of 0.65 was estimated. For the on -site basin, a
' runoff coefficient of 0.2 was estimated for the existing
condition and a value o .38 as used for proposed
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conditions. The value of .38 was determined from
information on the proposed development of the site. Ice
values were estimated using information from the Storm
Drainage Design Criteria Manual. The results of the
hydrologic analysis are shown in Table 1.
c TABLE 1
2-yr 36 --- --- 19 10.9cfs
10-yr 36 0.7cfs 1.32cfs 19 19.6cfs
100-yr 34 l Alcfs 2.67cfs 12 48.3cfs
It is estimated that the proposed development would
increase on -site flows by atinroximately 0 6cfs for the 10-
year event gnd 3__ cfs for the inn -year event. This is
approximately a 3% increase for the 10-year and 100-year
events over the total on -site and off -site flows. Please
note that the flows do not appear to be concurrent and that
peaks probably do not occur simultaneously.
'
EXISTING DRAINAGE SYSTEM DESCRIPTION
Off -site flows are conveyed by the major arterial
'
streets curb and gutter. The capacity of Spring Park Drive
is estimated to be approximately 50 cfs from curb to curb.
The depth the flowline the is
at of curb and qutter .5 feet
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and the crown is just inundated. This value of 50 cfs
exceeds the estimated 100-year flow of the proposed
'
condition of 49.6 cfs (Off -site flows plus increase in on -
site flows.).
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A 15" Reinforced concrete pipe (RCP) and two (2) 3'
'
wide curb inlets with grates exist at Spring Park Drive
adjacent to the site. The capacity of the two (2) inlet
'
structures is estimated to be approximately 39.6 cfs. The
capacity of the existing 15" RCP is estimated to be
'
approximately 10 cfs. Therefore, the capacity of the
'
existing RCP controls and is less than the estimated 10-year
and 100-year events. The culvert will however, convey
approximately the estimated 2-year runoff event of 10.9 cfs.
Please note that calculations were based on limited survey
'
information. Dimensions were determined in the field from a
'
site investigation.
Excess flows that are not able to enter the 15" RCP
'
storm sewer will pond in Spring Park Drive and eventually
overtop the North curb and migrate towards Spring Creek.
a e
The depth of flow the Spring Park is
over curb estimated to
be approximately 4" for the 100-year event. Therefore,
during a 100-year event, the crown of Spring Park Drive will
'
be inundated approximately 411. Maximum depth in Spring Park
Drive is estimated to be 10" more or less.
'
It should be noted that this analysis is done for local
off -site and on -site flows only and does not include
flooding- from
Spring Creek During concurrent flooding from
'
spring Creek, Spring Park Drive will be inundated to a depth
of 4978 feet for the 100-year event as indicated in the
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Spring Creek Master Plan. This depth is greater than one
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' 6
(1) foot over the crown in Spring Park Drive in most
' locations.
' PROPOSED DRAINAGE SYSTEM
The proposed on -site drainage system consists of curb
in the lot to the
and gutter parking area East. A curb
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opening in the Northern most island near the entrance to the
site has been incorporated to allow flows to he_convey_e_d_
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off -site. Capacities of the parking lot are adequate to
convey on -site and local off -site flows to the Spring Park
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curb and gutter.
Flows generated in the Western half of the site will
typically travel as sheet flow or shallow concentrated flow
during larger events. Runoff will discharge to the existing
Spring Park Drive curb and Sutter
'
Off -site and on -site flows reaching Spring Park Drive
will be conveyed by the existing 15" RCP and two (2) curb
'
inlets to Spring Creek. As stated earlier, it is estimated
that the 15" RCP can adequately convey the 2-year runoff
event. Larger frequency runoff events will overtop the
' Northern curb and gutter on Spring Park Drive and migrate to
Spring Creek. As stated earlier the estimated depth above
' the top of curb and crown on Spring Park Drive due to the
' 100-year runoff event is estimated to be approximately 4
inches. This depth is not expected to be increased
' significantly due to the proposed developments. Also, it is
probable that during flooding events, Spring Creek flooding
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will control in the vicinity and the existing 15" RCP will
be inundated. Increasing the size of the 15" RCP is not
expected to be beneficial in facilitating drainage in the
area.
During construction, erosion protection shall be
provided to adequately contain sediment discharge from the
site due to a large runoff event. Erosion control shall be
provided in accordance with the City of Fort Collins
"Erosion Contzol D—F �ence Manual". Straw bales and/or silt
fences will be provided as needed to reduce sediment from
entering off -site street areas and storm sewers.
CONCLUSIONS
Hydrologic and hydraulic analysis have been performed
in order to estimate peak runoff rates for both the existing
and developed conditions for the site in question. Off -site
and on=site flows will not be increased significantly due to
the development. On -site grading has been performed to
adequately convey on -site flows through the site without
significantly altering historic flow paths.
Off -site flows will be conveyed by existing street curb
and gutter. Erosion protection and sediment deposition
control structures will be provided during construction.
On -site flows will typically travel as sheet flow on
the Western half of the site and will be confined by parking
lot and drive areas on the Eastern half of the site. First
floor elevations of buildings are set at least 18 inches
8
above the nearest adjacent curb and gutter and are at least
18 inches above tle-estimated 100-year floodplain of Spring
Creek.
Results of this report indicate that the development
will not significantly cause increased runoff rates or
flooding depths and will not cause significant flood hazards
downstream or to structures on the site.
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APPENDIX A
CALCULATIONS
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DS ENGINEERING'CORPC
100 West 49th Si'r
LOVELAND,-•COLORADO
(303) 667.6010 493
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S.O. No. 704y
((! Subject: SP2iNV l.fiEEIC (C6UMMY Dxv Se H00t_.
Sheet No. �of
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Drawing No.
Computed by 5� Checked By Date O2 I ��
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P�R�a L S�oAF - ,00-) = 3301. AREa,=
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32��ly�sF : `lo imp = 23
COS ENGINEERING CORPORATION S.O. No.
'100'West 29tliStmet subject
: -sppufu� QA,
LOVELAND, COLORADO 8053
(303)'667-8010 ;;493-8010� Sheet NO. Of
Drawing No.
Computed by Checked By Date
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CDS ENGINEERING CORPORA
100 West 29th ttreit
LOVELAND. COLORADO 8(
(303) - -067-8010• i:-419"
Subject
Computed by `5W k Chocked By
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S.O. No. _701-i L-1
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Sheet No. of
Drawing No.
Date 021041CU
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L'S ENGINEERING CORPORATION
100 West 29th Street
LOVELAND, COLORADO 80538 ;Subject:
(303) 667-8010 :---�493-8010
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S.O. No. 7OH ('
Sheet No. Ll of 6
Drawing No.
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ICDS ENGINEERING CORPORATION
100 West 29th Street "`
'LOVELAND, COLORADO 80538
(303) 667-8020 4 493-8020
SubjectSP 2i
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Computed by - 5 W (� Checked By
S.O. No. r 0S y
Sheet No. J of
Drawing No.
Date 021051A1
ICOS ENGINEERING CORPORATION
100 West 29th Street
'LOVELAND. COLORADO 80538
(303)' 667-8010 , 493-8010
Subject:
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SECTION A -A .ma wa. yr m.a na
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ACCESS RAMP DETAIL
VERTICAL. CURB WITHOUT APRON
Its NO OVEM AS Is EXPESTINEGIVALK
ADDITIONS TO EXISTING SIDEWALKS
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SEDIMENT FILTER
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PERSPECTIVE VIEW
NOTE
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SECTION A -A
era
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tort R"MI. b
REM.W0
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SEEMS'.
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31R
NEW DRIVEWAY APPROACH DETAILS
VERTICAL CURB AND GUTTER
Engineering
Corporation
3101 V. DESERT IN RA SUITE BA IDS Wet EGGS Shelf
LAS WGAE, NEVADA a9im LOVkLVID. COLORADO 60534
(702) 311 (303) 687-8010 183-8010
2. Piece ord S:dkr. 2:-y
Bales
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9R =F
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3. Badflla"d Compact Ememoted Coll Faker Feh,:e
Alktth Sealindy to
I Stmu B°le Skeet o.ri
Tw-ne1Wood Pos! C pecked Bttkfalcfxl BSckf�llRuwffl f i Runoff f AIM, CAEAS� Aq,(
of ni
CROSSSECT 014 VIEW SECTION VIEW
STRAW BALE BARRIER
SILT
FENCE
INSTALLATION
DN CONTROL DETAILS IFFIFFIFFIFT
LEE FETTERS
COS ENGINEERING CORPORATION
•CmvN"9 E e en u"a Pmrmbnd Gn.wailm
N9tee
1. All off site construction shall be subject to inspection
by the City Engineer and shell conform to the July,
1996, 'Street Design Criteria and Construction
Standards" for the City o1 Fort Collins.
2. Bituminous pavement and curb and gutter, shall be
removed to clean, straight lines by saw or wheel cutting
at the locations shown on the drawings.
3. Traffic control devices shall be provided by the
contractor for work along public streets.
1. Structural backfill shall comply with CODE
Specifications for Class I material. Subgrade and base
serial shall be compacted to at least 95% of maximum
density within t/ 2e of optimum moisture content as
determined by ASTH D698 78.
5. Erosion protection shall be provided during construction
in accordance with the City of Fort Collins "Erosion
Control Reference Manual". Straw bales or milt fences
shall be used a necessary to minimize sediment from
entering street areas and curb inlets during runoff
events.
nTLE. SPRING CREEK
COUNTRY DAY SCHOOL
71TLE:
DETAIL SHEET
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UTILITY, DRAINAGE & GRADING PLAN - aD
SCALf F-i?S7
Discharge Table I
I ,rpF Atonalfor surta 6YF5 eNAT IOWAXT 4 As1C[V.iES
B6"in IQ_vM 100-year SECTION A
A 0.2 ere 0.3 cfe ✓" prelimtnaru conarrucrlon S-------
B 0.9 cfa 1.8 cfs
C 0.7 cfe 1.4 cfa 1. Excavate foundation, construct and backlill
Off -Site 1.4 cfs 2_9 cfe z_ET_L_ 2. Building wnstzuction
I�_q�� USCG- 1. site grading
Total 3.2 cfe 6.4 cfa H e. Curb and gutter installation
SEC110N B B. Asphalt pavement
�—
®Engineering
Corporation
jIW W. DESERT D8d RA SO1TE 27 lO0 W 29% Shalt
LAS VEGAS, NEVADA 88102 LOYIIAND, COLORADO BOSSE
(702) 364-1820 (301 66T-BOLO 493-MO
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ON —SITE CONSTRUCTION DETAILS
(Nor OFF-51 9 DrfAl:a. SEC SHEET eof 2)
2 f I GENERAL NOTES
L to street sanitary Fracre., storm sewer, and eater Lions construction teat date of
execution
or Fort Collins
lo standards agr and specifications <to ibis ev love or
t anion or on lowering three
agreement a Pertaining In. n of the develop
I Asir construction occurring ire r renal utter the u< or me the
_
nl er who r snag reqire he to y be madeaiion of of plant to ere end
i most
who may require that
that n<r be made. to confirm lu standards and eeae a -oat
Specification current nt bit time.
d
II IrE I 11 Seen paving shall not start until the soi $ report an saucers design are
GO YFl approved by the Eng near and subgrade compeer oy cvs aken and
Ne SI�L approved.
LAID type. size. local on and number or all known underg•cuAd utilities are CONCRETE PAN
approximate when shown on The drawings. It mall N the responsibility of N10
ere contractor le verify ernaa
e existence and [motion of all e a ndnst nd
utilities along the route of the workBefore commencing n construe.
tbin, the contractor shall be responsible for unknown underground utilities.
d/ The engineer who has prepared these plant. by `•contained
c enc ion and/or sea[
L, hereof, does hereby affirm responsibility t me City, a beneficiary of .y. aid engineer's work• for any errors and emissions conta ed in shoe plant.
and approval or these plans by the. City Engineer shall not relieve the
engineer o hasprepared these plans of all such responsibility.
s. s \ When an existing vpnsli street mutt N cut. the street mist be restated to
'a a condition equal to or bcier than in original condition. The existing
q street condemn shall be documented by the City construction Inspector
Mrore any cuts are made. Patching shall be done in conformance with
the City of Fort Collins Street Repair snndardL The rained patch shall
9dA1 j mend smoothly into the existing surface. All large patches shall be pared
5 ec1 vwith a asphalt lay -down machine. In str«¢ where must than on t e
'<" made, overlay of the entire strut width, including m< patched er a
may be The determinationof need For a complete overlay shall
be de by me Director of Egning.
&Prior to the commencement of any eomtruetion, the contractor shall contact
all utilities to coordinate icM1edu[eL and the City Forester to schedule A site
impeclum for any tree removal requiring a Permit.
). Prior to the commencement of any construction, the contractor shall give
the City Engineering cDepartment H (twenty-four) hours advance notice.
A Prior to the commencement of any construction that will effect traffic
1- signs or any type, the contractorShall contact the City of Fort Collins
Areas Division who wilmporarily remove or Schrum tie sign at no cost
to the contractor However, if the contractor moves the traffic sign
himself the <o tmet r will be charged for the labor, materials and
equipment to reinstall the tin as casting
9/ Nel t f - it t t f illtle h 11 b
e e a
VICINITY MAP aD rho"resp"onsibility'of the property comars.)
10/ If chwitering is used to install utilities then a State
Construction Dewatering wastewater Discharge permit is
required if discharged into a atnre sever, channel,
irrigation ditch or any waters of the United States.
11. Erosion control to be implemented in accordance with
the City of Fort Collins -Erosion Control Reference
Eanual for construction Sites', dated January, 1991, or
latent addition.
CLIENT:
P
dECT TITLE:
SPRING CREEK
P91-700M
LEE FETTERS
COUNTRY
DAY SCHOOL
COS ENGINEERING CORPORATION
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UTILITY,
DRAINAGE &GRADING PLAN
pma „D LA o �NHCIPK PL, I G L„„D AND CONSTRUCTION SURVIVES
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