WA0003-CS080603Fe ones mw Nichols
INNOVATIVE APPROACHES... PRACTICAL RESULTS
LETTER OF TRANSMITTAL
To: Ken Griffin Date: June 3, 2008
City of Coppell
255 Parkway Boulevard
Post Office Box 9478 Project: CPLO8183
Coppell, Texas 75109 -9478
(972) 304 -3686
We are sending you the following items:
- 2 Copies of the Final Technical Memorandum
These items are transmitted for your:
® Use ❑ Review & Comment ❑ Information
❑ Approval ® Distribution to Parties ❑ Response
❑ Records ❑ Other:
Mr. Griffin:
Freese and Nichols, Inc. is pleased to submit ten (2) final copies each of the Technical Meorandum.
Please contact me if there are any questions.
Sincerely,
Jessica Brown, P.E.
Freese and Nichols, Inc.
(817) 735 -7406
L: \Fort Worth \WP \I \LTE06316 \LET\LETTER OF TRANSMITTAL 3- 31- 08.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
ra
Fm*" aad Nichols
MEMORANDUM
TO: Ken Griffin, P.E., City of Coppell
FROM: Jessica Brown, P.E., Freese and Nichols, Inc.
Jessica Bradley, E.I.T., Freese and Nichols, Inc.
8StCA L AWN
SUBJECT: Analysis of Water and Wastewater Systems for gp -
Service to Southwest Coppell '# e
DATE: May 20, 2008 S TONAL E 0
A8
1.0 Introduction
Freese and Nichols, Inc. (FNI) was contracted by the City of Coppell to evaluate the water demands
and wastewater flows for the area near Dividend at Belt Line Road. The existing water and
wastewater systems with the proposed improvements from the water and wastewater impact fee
study were studied to determine if there is adequate capacity to serve the study area. The required
water demand and wastewater flow for the development were provided by the City.
2.0 Water Demands
Figure 1 displays the buildout water system with the study area highlighted. Several assumptions
from the Impact Fee Study, performed in 2005 by Freese and Nichols, were utilized to determine the
water demands. The historical population and water usage data is shown in Table 1. The number of
residential acres was used with a density of 13 people /acre and average day usage of 185 geed to
calculate water demands. The commercial acreage and usage of 1250 gpd/acre were utilized to
determine the water demands from commercial areas. For parks and open space, the water demand
was calculated using 250 gpd/acre. The assumptions listed above were used to determine the
average day water demand. A maximum day to average peaking factor of 2.25 and a peak hour to
maximum day peaking factor of 2 were used to determine the maximum day and peak hour demands
for the city. The existing and buildout populations and water demands are shown in Table 2 and
Table 3. The Land Use Plan for buildout is displayed on Figure 2.
ICPL08183)T:1MEMWkW TORnal Tech Memo.doc
Freese and Nichols. Inc. • Engineers • Enviranw" Scientists • Arcivilocis
4055 kWemallonel Plaza • Suite 200 • Fort Worth, Texas 761094085
(817) 735 -7300 • Metro (817) 429 -1900 • Fax(617)735-7491
Table 1: Historical Population and Water Usage Data
* Historical Average Residential Water Demand (gpd/person) _ (Average Day Water Usgae - (Commercial Acres * Commercial Water Demand) - (Parks
and Open Spaces Acres * Parks /Open Space Water Dmenads))/Population
[CPL08183]T:NMEM \Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 761094895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
Historical
Average
Historical
Average
Parks /Open
Residential
Average
Day
Park/Open
Spaces
Commercial
Water
Day/Max
Water
Max Day
Commercial
Space
Residential
Average
Water
Water
Demand
Day
Usage
Water Use
Acres
Acres
Acres
Residential
Demand
Demand
(gpd/
Peaking
Year
1 Population
MGD
GD
acres
acres
acres
Po /Acre
d/acre
d/acre
person)
Factor
2000
36,051
8.3
17.0
1,683
847
2,705
13
250
1,250
165
2.05
2001
36,867
8.0
17.0
1,707
859
2,766
13
250
1,250
153
2.12
2002
37
7.6
16.9
1,731
871
2,827
13
250
1,250
139
2.22
2003
38,499
8.4
17.8
1,755
883
2
13
250
1,250
155
2.11
2005
38,900
9.47
17.05
1877
895
2,900
13
250
1,250
177
1.80
2006
39,200
7.94
18.17
1974
895
2,900
13
250
1,250
134
2.29
2007
39,350
-
17
1974
895
2,900
13
250
1,250
-
-
* Historical Average Residential Water Demand (gpd/person) _ (Average Day Water Usgae - (Commercial Acres * Commercial Water Demand) - (Parks
and Open Spaces Acres * Parks /Open Space Water Dmenads))/Population
[CPL08183]T:NMEM \Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 761094895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
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FIGURE I
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CITY OF COPPELL 16"
I"-";! I J, C4
BUILDOUT WATER SYSTEM
LEGEND
r7 Water Lines
Elevated Storage Tank
10 and Smaller
Ground Storage Tank Rd.
12" and Larger
Proposed Ground Storage Tank
streets
Pump Station
Southwest
12 Proposed Pump Station Study Area
Proposed Water Line City Limits 0 1,000 2,000
'
SCALE IN FEET
Freese and HICINOIS
J,bN.,
Table 2: Water Demand Criteria
Table 3: Projected Water Demands
Average
Maximum
Peak
Day
Average
Hour
Maximum
Peak Hour
Demand
Demand
Year
MGD )
(MGD)
(MGD
Day
Average Day
Day to
to
Buildout
12.3
27.7
55.5
Average
Commercial
Park/Open
Average
Maximum
Parks /Open
Residential
Water
Space Water
Day
Day
Pop /Res
Commercial
Spaces
Usage
Usage
Usage
Peaking
Peaking
Year
I Population
Acre
I Acres
acres
cd
d/acre
d/acre)
Factor
Factor
2008
39,192
13
2,379
941
185
1250
250
2.25
2
Buildout
40,118
13
3,719
1,017
185
1250
250
2.25
2
Table 3: Projected Water Demands
[CPL08183]T:\MEM \Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
Average
Maximum
Peak
Day
Day
Hour
Demand
Demand
Demand
Year
MGD )
(MGD)
(MGD
2008
10.5
23.5
47.1
Buildout
12.3
27.7
55.5
[CPL08183]T:\MEM \Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
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E FIGURE 2
41INt 1
CITY OF COPPELL
ORIGINAL 2015 (BUILDOUT) LAND USE PLAN
LEGEND
Landuse [ Regional Retail
t Flood Plain j _I Neighborhood Retail
Historic Overlay Residential High Density
w Light lndistrial Showroom __ N Medium Density N
w Freeway Commercial Residential Low Density
y z o Freeway Office 3 Public Institutional
t Zo
i <R Mixed Use Park Open Space
a "
P O1 0 2, 500
a rill ,- Freese ee Nichols SCALE IN FEET
,-
The water demand for the study area were provided by City staff and are 1.0 MGD for average day,
1.5 MGD for maximum day, and 2.25 MGD for peak hour.
3.0 Wastewater Flows
Figure 3 displays the proposed buildout wastewater system. The historical population and
wastewater flow data are shown in Table 4. The projected wastewater flows were developed for
the Dallas County College Analysis performed by FNI in 2007. A residential per capita of 80
gpcd was used. Commercial areas and parks and open space areas had loads of 750 gpd/acre and
50 gpd/acre, respectively. A peaking factor of 4 was utilized to determine the peak wet weather
flow. The existing and buildout populations and wastewater flows are shown in Table 5.
[CPL08183]T:1MEM1Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
Upd.lwd T, —day, May 20, 2tT,8
The study area's projected wastewater flow was provided by City staff and is 0.7 MGD for
average annual daily flow and 2.8 MGD for peak wet weather flow.
4.0 Water and Wastewater System Analysis
Water
A hydraulic model of the existing 12 -inch and larger pipes was created using H2OMap Water.
Demands were distributed using the buildout land use assumptions. The existing water system
was analyzed for three demand conditions: maximum day, peak hour, and maximum day plus
fire flow. The maximum day analysis indicated that the current distribution system has the
ability to maintain levels in the elevated storage tanks. The peak hour model analysis showed
that all areas of the city were capable of maintaining pressures of 35 psi or greater. Fire flow
analysis indicated that all areas of the system are able to maintain a residual pressure of 20 psi
with 1,000 gpm of demand superimposed on the maximum day demands. The study area is able
to provide up to 3,000 gpm of fire flow under maximum day demands with a residual pressure of
20 psi. There was no excessive velocity or headloss in any of the pipes for any of the demand
conditions.
Wastewater
A hydraulic model of the lines along Beltline Drive was built using H2OMap Sewer. Loads
were distributed using buildout land use assumptions, and the wastewater system was analyzed
for peak wet weather flow. The 12- and 15 -inch line north of the study area also experienced
surcharging and there a few manholes overflowing. Figure 4 shows the areas where the
wastewater system is currently deficient. The red lines show where the flow over the total
capacity (q /Q) is greater than 0.90. Having the pipes flow at greater than 90% full indicates a
need to upgrade these lines; however, since the lines are being modeled for buildout conditions,
flows between 90% - 95% may be acceptable. The majority of the deficient lines are on the
Denton Tap Road and Beltline Road.
5.0 Conclusions
The water system is capable of handling the additional demands associated with the new
development if the Capital Improvement Plan from the Impact Fee Study is implemented. The
wastewater system has deficiencies in the existing system that should be addressed before any
additional flows are brought online.
[CPL08183]T:1MEM1Final TM1Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
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Table 4: Historical Population and Wastewater Flow Data
Year
Population
Average Day
Wastewater
I Flow m d
Commercial
Acres acres
Park/Open
Space Acres
acres
Residential
Acres acres
Parks /Open
Spaces
Wastewater
Production
d/acre
Commercial
Wastewater
Production
d/acre
Historical
Average
Residential
Wastewater
Production
d/ erson
2000
36,051
3.5
1683
847
2705
50
750
62
2001
36,867
3.9
1707
859
2766
50
750
71
2002
37,683
3.9
1731
871
2827
50
750
69
2003
38,499
3.9
1755
883
2888
50
750
67
2004
38,650
4.0
1779
895
2900
50
750
68
2005
38,900
3.7
1877
895
2900
50
750
58
2006
39,200
3.2
1974
895
2900
50
750
43
2007
39,350
3.4
1974
895
2900
50
750
48
*2006 Average Day Wastewater Flow is calculated with January through October data
* Historical Average Residential Wastewater Production (gpd/person) _ (Average Day Wastewater Production
- (Commercial Acres * Commercial Wastewater Usage)
(Parks and Open Spaces Acres * Parks /Open Space Wastewater Usage )) /Population
[CPL08183]T: \MEM \Final Tech Memo.doc
Freese and Nichols, Inc. * Engineers * Environmental Scientists * Architects
4055 International Plaza * Suite 200 * Fort Worth, Texas 76109 -4895
(817) 735 -7300 * Metro (817) 429 -1900 * Fax (817) 735 -7491
Table 5: Wastewater Flows
[CPL08183]T: \MEM \Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491
Average
Average
Peak Wet
Average
Daily
Daily
Weather
Average
Daily
Commercial
Park/Open
to Average
Annual
Peak Wet
Parks /Open
Residential
Water
Space Water
Daily
Daily
Weather
Pop/Res
Commercial
Spaces
Loading
Loading
Loading
Peaking
Flow
Flow
Year
Population
Acre
Acres
acres
cd
d/acre
d/acre
Factor
MGD )
(MGD
2008
39,192
13
2,379
941
80
750
50
4
5.0
19.9
Buildout
40,118
13
3,719
1,017
80
750
50
4
6.0
24.2
[CPL08183]T: \MEM \Final Tech Memo.doc
Freese and Nichols, Inc. • Engineers • Environmental Scientists • Architects
4055 International Plaza • Suite 200 • Fort Worth, Texas 76109 -4895
(817) 735 -7300 • Metro (817) 429 -1900 • Fax (817) 735 -7491