HomeMy WebLinkAboutWater Design ReportK. Chen Fin
Consulting Civil Engineers
July 6, 2011
Ms. Erika Bridges
City of College Station
P. 0. Box 9960
College Station, TX 77642
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Re: McDonald's Restaurant, Tower Point
KCE Job # 0696 -01
Water Line Design Statement
Sanitary Sewer Design Statement
Best Regards
K Che Engineering
ineerin
A Division of KC United, Inc.
The waterline servers Lot 7, Block 3 of the Tower Point Subdivision (McDonald's Lot)
was designed by Walter P. Moore & Associates and constructed by the Tower Point
Developer. Currently a 12" waterline has been brought into the southeast corner of the
lot 7 and ready to serve the proposed McDonald's development
The proposed McDonald's restaurant building is 3911 square feet and classified as fast
food restaurant with designed water consumption (demand) of 3500 gallon per day. The
size lot 7 is 1.3064 acre. The building will be sprinklered and will be constructed of Type
V -A construction which requires 1500 gpm fire flow per IBC 2009.. According to Walter
P. Moore's design, the waterline was sized to provide service to 16.5 acres of
development with an average water demand of 7,000 gallons per day per acre.
Therefore, the lot 7 is allocated with 9100 gallons per day of water supply which is more
than enough to satisfy the water demand of proposed McDonald's development.
The sanitary line designed by Walter P Moore & Associates and constructed by the
developer of the Tower Point Subdivision. The 10 inch sanitary line is located along
Private Drive " A" with a lateral stub out located at the southwest corner of the subjected
property to serve lot 7 (McDonald's Lot). The proposed McDonald's is designed to
produce an average daily flow of 2,625 gpd and a design peak flow of 10,500 gpd or
0.016 cfs. As per Walter P Moore's design, the 10" inch sanitary line would have a
maximum pipe capacity of 1.39 cfs which is sufficient to serve the McDonald's
development.
6161 SAVOY, SUITE 310 HOUSTON, TEXAS 77036 PHONE: 713.952.6888 FAX: 713.952.9994
I. GENERAL LOCATION
The McDonald's Drainage Analysis
The proposed McDonald's restaurant is located near intersection of State
Highway 6 and William Fitch Parkway in the city of College Station, Texas. The
1.3 acre tract is currently undeveloped and is platted as lot 7, block 3 of the Tower
Point Subdivision Phase II.
From the Drainage Policy and Design Standards Manuel for the City of College
Station, our property is situated in the Spring Creek Drainage Basin. The site is
part of Tower Point shopping center development and uses the regional detention
facility developed for the project.
II. PROPERTY DESCRIPTION
The proposed McDonald's will be situated on 1.3064 acres, located on the
southwest corner of the intersection of Highway 6 and Private Drive "A" of
Tower Point Shopping Center, College Station, Texas. The McDonald's will
encompass all of Lot 7 in Block 3 of the Tower Point Subdivision.
Currently, the site is undeveloped and has a natural grassland cover. The
proposed development will encompass a parking lot as well as single story
building. The owner of the property is McDonald's Corporation and the current
zoning is C -1 and OV. The zoning classification will remain unchanged.
III. DRAINAGE BASIN DESCRIPTION
The proposed McDonald's is going to drain into the storm sewer system located
within the storm water easement on site via a proposed inlet.
The property is located in Zone "c ", areas outside the 100 -year flood, as identified
by the flood insurance rate map of the federal emergency management agency,
map no. 480401CO205 D
IV. EXISTING DRAINAGE CONDITIONS
Parameters:
Area:
"c" value (grassy, undeveloped):
Ito (College Station Rainfall Curves):
Iioo (College Station Rainfall Curves):
TC (See Exhibit 1):
1.3064 acres
0.40
5.81 in/hr
9.15 in/hr
20.00 minutes
Based on the parameters listed above, the following pre - development peak
discharge rate has been found:
Qio (c x I x A):
Qioo(cxIxA):
V. DEVELOPED DRAINAGE CONDITIONS
Parameters:
Area: 1.3064 acres
Landscape Area: 0.16 acres
Impervious Area: 1.14 acres
Composite "c" value: 0.83
I (College Station Rainfall Curves): 8.25 in/hr
I100 (College Station Rainfall Curves): 12.5 in/hr
TC: 10 minutes
Based on the parameters listed above, the following post - development peak
discharge rate has been found:
Qlo(cxIxA):
Qloo (c x I x A):
VI. IMPACT TO DRAINAGE SYSTEM
3.03 cfs
4.78 cfs
8.94 cfs
13.55 cfs
The post - development runoffs at the site for the 10 -year and 100 -year storms
respectively are 8.94 cfs and 13.55 cfs with post development runoff C value of
0.83. According Walter P. Moore report, the post development drainage for
Tower Point was designed to use C value of 0.9. The runoff allocated for Lot 7 is
9.80 cfs for the 10 -year storm. The McDonald's site has a total post development
runoff of 8.94 cfs for the 10 -year storm which is smaller than WPM original
design runoff. Therefore, there is no adverse effect to the existing drainage
system. The existing system was designed to handle the post - development runoff
from the site. The regional detention facility is also adequate to serve the
proposed McDonald's Development.
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K. Chen
A Division of KC United. Inc.
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Consulting Civil Engineers and Surveyors Houston Dallas
6161 Savoy, Suite 310, Houston, Texas 77036
Phone: 713.952.6888 Fox: 713.952.9994
'KC JOB #: 0696 -01
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CERTIFICATION SHEET
I hereby certify that this report for the drainage design of McDonald's on Highway 6
and William Fitch Parkway was prepared by me (or under my supervision) in
accordance with the provisions of the City of Co11eu Station Drainage Policy and Design
Standards for the owners thereof. i �� P �E OF rex I+
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rofessional Engineer
State of Texas No. 79711