HomeMy WebLinkAboutDrainage Reports - 04/03/1990FINAL DRAINAGE INVESTIGATION
FOR
APPLEWOOD ANIMAL HOSPITAL
FORT COLLINS, COLORADO
Prepared for
Dr. William Musslewhite
5001 South Shields Street
Fort Collins, Colorado 80526
March 20, 1990
Commission No. 1180-01-01-02
CONSULTING ENGINEERS
FOUNDATION ENGINEERING
320 N. Cleveland Avneue
Loveland, Colorado 80537
i
FOUNDATION II Counsulting
ENGINEERING Engineers
March 20, 1990
Commission No. 1180-01-01-02
Dr. William Musslewhite
5001 S. Shields Street
Fort Collins, Colorado 80526
Dear Dr. Musslewhite,
The enclosed report represents the results of the final drainage investigation
for the Applewood Animal Hospital, located in the Northeast Quarter of Section 3, i
Township 6 North, Range 69 West of the 6th P.M., Larimer County, Colorado.
This investigation was based upon the proposed site development plan and plat;
proposed site development construction plans; 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.
It is our opinion that the construction of the Applewood Animal Hospital is
feasible provided that the recommendations contained in the attached report and
the incorporated final design are performed in accordance with the final approved
plans for the project.
If you should have any_.quest`;olease call.
Respe u ly, ;;.� 5-ot .......�{,' - s 23841
Kevin W. tterson, P.E
FOUNDATION ENGINEERING
KWP/kmp
320 North Cleveland Avenue 0 Loveland, Colorado 80537 0 (303) 663-0138
TABLE OF CONTENTS
Letter of Transmittal
Table of Contents
Scope
Site Description
Existing Conditions
Proposed Development
Conclusions and Recommendations
EXHIBITS
Vicinity Map
Calculations
Drainage Plan/Site Plan
Preliminary Drainage Report Comments
Exhibit A
Exhibit B
Exhibit C
Exhibit D
ii
S C O P E
The following report represents the results of a drainage investigation
for a proposed development to be known as the Laurie Subdivision, located
on a parcel of land situated in the Northeast Quarter of Section 3,
Township 6 North, Range 69 West of the 6th P.M., Larimer County,
Colorado. The investigation was performed for Dr. William Musslewhite.
The purpose of this investigation i to determine the effects of the
proposed development on the area existing drainage conditions and to
determine the improvements, if any, and the appropriate sizing for
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 and plat; proposed site development 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.
S I T E D E S C R I P T I O N
The site is generally rectangular in shape and contains approximately
eight acres, however, the sit& East-West dimension is approximately
1,150 feet and its North -South dimension varies from approximately 390
feet at the westerly boundary to approximately 280 feet at the easterly
boundary. The site abuts the westerly right-of-way of South Shields
Street at a point approximately one-half mile south of Harmony Road. The
site is located on the Burns Tributary of the Fossil Creek Drainage
Basin. Only Lot 1 (Applewood Animal Hospital), is to be developed at this
time. AD
E X I S T I N G C O N D I T I O N S It, �i
The site is presently used as a large residential tract with the existing
structures located at the southeast.corner of the site near South Shields
Street. The Pleasant Valley and Lake Canal passes through the adjacent
property to the north with a lateral of that ditch flowing through the
site. Near the center of the site is a ravine that has been created by
scouring action associated with an overflow discharge from the Canal as
it flows across the site toward the South. According to the irrigation
company's officials, the overflow to the ravine is designed to discharge
a maximum flow of 30 c.f.s. (cubic feet per second).
East of the lateral ditch passing through the site, the property slopes
gently to the East toward South Shields Street at a slope of
approximately 2%. The area below the ditch is irrigated and is used for
pasture except for the residence and out -buildings at the southeast
corner of the site.
1
The portion of the site that lies West of.the ravine is not irrigated and
slopes rather steeply at approximately 15% toward the Burns Tributary of
Fossil Creek. The area is sparsely vegetated with ground cover consisting
mainly of native grasses and sage brush. The site abuts The Ridge
Subdivsion at the West and South.
The site receives run-off from the properties to the North and West. For
the purposes of this investigation, th area above the Pleasant Valley
and Lake Canal was not considered to iffect the conditions onsite since
the ditch flow is controlled to the extent that there is an existing
overflow structure that directs excess flow to the ravine throua the
site, as previously stated. The area to the North con t of
approximately 10.5 acres which drains easterly to South Shields Street
and then southerly along the west side of South Shields Street through
the site. An area of approximately 2.5 acres drains into the smaller side
ravine that enters the site at mid -point of the northern boundary.
Approximately 4.5 acres drains directly into the major ravine before it
enters the site near the northwest corner.
P R O P O S E D D E V E L O P M E N T
The proposed construction is to consist of a vetinary clinic with
associated parking that is to be located on Lot 1, situate in the
northeast corner of the site adjacent to South Shields Street. A new cul
de sac street is to be constructed to serve the new clinic and the
existing residence. The cul de sac is to be extended to a circular turn-
around west of the existing and proposed construction in order to provide
access to the area to the West. At this time, development to the West is
not planned, however, future development is assumed to be single family
residential. CLdo�i�jD/lQ &e, ve*xGtr'� IQ��
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C O N C L U S I O N S A N D R E C O M M E N D A T I O N S
1. The proposed development will retain the existing drainage patterns
with only a culvert to be provided under Laurie Drive.
2. As South Shields will be reworked and widened to full width in the
near future, and the shallow nature of the borrow ditch in which the 24"
RCP is to be placed, we recommend instead the use of a 15" RCP. At the
time South Shields is widened, the RCP will be abandoned. Provide for
overflow of Laurie Drive due to 100 year flood.
3. The site is located in the eossil Creek Drainage Basin. The site is
not located within the floodway or flood plain.
4. All development is to be performed in accordance with City of Fort
Collins Standards and Specifications.
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5. Onsite detention of stormwater is not recommended due to the site
proximity to the existing "Major"drainage course. Gm107di>z1IV1".7 /5�le 4/-
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6. Additional runoff from the Applewood Animal Hospital clinic travels to
the West drainage ditch, then flows qQuth to Fossil Creek.
opinion that e small amount of additional runoff from the site will not
require enlargement of downstream facilities.
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Dr. Mussleshite-Laurie Subdivision
By: DRM
Commission No. 1180-01-01-01
Date: March 20, 1990
Calculations for Drainage Investigation for Laurie Subdivision located in
the NE 1/4 of Section 3, Township 6 North, Range 69 West of the 6th P.M.,
City of Fort Collins, Larimer County, Colorado.
Total Site Area = 8 acres +/-
EXISTING CONDITIONS
Rational "C" Factor = 0.20 for Offsite Irrigated Areas
it to
It
= 0.25 for Offsite Steeper Non -irrigated Areas
It
to
" = 0.25 for Onsite Irrigated Areas
It
It
it = 0..30 for Onsite Steeper Non -irrigated Areas
PROPOSED DEVELOPMENT FOR LOT 1
Rational "C" Factor = 0.225 for Lawns and Landscaped Areas
= 0.95 for Roofs, Decks, Patios, etc.
= 0.95 for Streets, Drives, and Parking
Lawns and Landscaped Areas = 29,413 sq. ft.
Roofs, Decks, Patios, etc. = 4,400 sq. ft.
Streets, Drives, and Parking = 13,800 sq. ft.
Area of Site Consideration = 325' x 146.5' = 47,613 sq. ft.
"Q" avg = (29,413 x 0.225) + (4,400 x 0.95) + (13,8000 x 0.95)/ 47,613
"Q" avg= 0.50
Refer to following calculations for runoff quantity determination
CULVERT SIZING
1. New culvert to be installed at cul de sac street from Shields
Street.
The culvert is considered to be at "Inlet Control". Based upon the
runoff
calculations the design flows at this point are: _=6 cfs; and
Q100=20
cfs; therefore -
Using the Design Nomograph for Circular Pipe at Inlet Control:
��
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@ HW/D = 1.0 and Q = 6 cfs an 18" dia. pipe will be sufficient
yl'
GAP
@ HW/D = 1.5 and Q = 20 cfs a 24" dia. pipe will be sufficient
4,8
USE a 15" dia. pipe due to site constraints . ; a GC .�u �
j%qU� Q �Z
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EROSION CONTROL
The primary area of concern is the newly graded area adjacent to
Laurie
Drive at the inlet and outlet of the 15" culvert. We recommend
these
areas be seeded with pasture grasses. This �equire some type o
rop
structures" along its course, and inlet and outlet protection
proposed culvert under the cul de sac street. Additional protection
at the
at'��
dryta
the inlet and outlet ends of the culvert at Shields Street should
also be
4
provided.
The City's Standard Erosion treatments for wind and storm -runoff should)
also be incorporated during the course of construction.
5
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EX�H�I�BIT "C"
City of Fort CoUins
DATE. 3 Jan 90 DEPARTMENT. �, W
ITEM. 44-89B SHOUTH SHIELDS VETERINARY CLINIC PUD - Final
No Problems
Problems or Concerns (see below)
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Date Signature
DEVELOPMHNT SERVICES 300 LaPorte Ave. P.O.Boz 580 Fort Coffins. Colo W522-0580 (303)221-6750
PUNNING DEPARTMENT
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