ST9302-CS 940304COPPELL PUBLIC WORKS
DATE:
TO:
FROM:
RE:
MEMORANDUM
March 4, 1994 (/
\\~./
Steven G. Goram, Director of Public Works~
~\¥\
Howard L. Pafford, Utilities Superintendea~x
Sandy Lake RST 92-02 - Rady Study
(Tickler 3/3/94)
Attached you will find a packet that includes all the information requested by Rady and
Associates that we can provide from this office.
If you have any questions regarding this information please advise.
HLP/dm
RADYASSO.HLP
To.'
From:
RE:
Date:
MEMORANDUM
Steve Goram, Director of Public Works
Kenneth M. Griffin, P.E., City Engineer
Sandy Lake Road (ST 93-02)~-~rCO~d~
February 18, 1994
PUBLIC WORKS
As you are aware, on February 8th, 1994, the City Council approved an amendment to the Rady
and Associates contract for the design of Sandy Lake Road. This amendment allowed for Rady
and Associates to perform some modeling of the existing water system.
Attached to this memo, please find a letter from Rady and Associates detailing the type of
information necessary so that they can perform the modeling of the water system. The letter
indicates that they would like to have this information no later than March 7th, 1994 so that they
can stay on track for modeling the water system.
If you should have any questions please feel free to contact me at your convenience.
Rady & Associates, Inc.
Engineers · Ardmtects · Plam~ers
February 17, 1994
Mr. Ken Griffin, P.E.
City of Coppell
P. O. Box 478
Coppell, TX 75019
Coppell Sandy Lake Road & 24" Water Line
Project No. ST 93-02
R&A No. 93021.00
Dear Ken:
Enclosed is a letter outline of a "Water System Analysis - Logical Progression of Tasks".
Rady & Associates will need the information identified in Items A - Data Collection:
System and B - Data Collection: Water Demands, before we can begin the development
and calibration of the water system model.
Loading, calibrating and running the model will take between six to eight weeks. In
order to meet our schedule for preliminary design, we need to receive the information
in Items A and B by March 7th.
Your assistance in this matter is greatly appreciated. If you or your staff has any
questions regarding the requested information, please call me or Adel Zantout.
Sincerely,
RADY & ASSOCIATES, INC.
RllVl/pb
Encl.
010 Collier Street · Fort Worth 'Iexas 76102-3542 ° 817,335-0511 · Metro 817,0-54-4266 ° Fax 817/335 5070
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WATER SYSTEM ANALYSIS
LOGICAL PROGRESSION OF TASKS
NOTE: Rady and Associates will work closely with the city to ensure all requirements
are satisfied and client expectations are met in a timely fashion.
Data Collection: System
1) Identify location, type, age and size of existing piping network
2) Identify location, size, and overflow elevations of water towers
3) Identify location and size of ground storage tanks and pumps including
head discharge relationships and any instrumentation/operation
parameters
4) Identify locations and characteristics of pressure regulating valves and rate of flow
controllers
5) Identify pressure plane boundahes
6) Obtain topographic map of service area
7) Identify locations and capacity of water supply sources ie. wells, water treatment
plants, and outside purchases
8) Obta/n population, number of connections, and land use (current and future
projections) for the city
9) Identify water conservation measures
Data Collection: Water Demands
1) Locate historical water use and pumping records
a) Annual demands: average day, max. day, max. hour, and diurnal distribution
b) Identify large volume users
c) Obtain sampling of meter books to determine average water demand per type
of connection
d) Include any periods of water rationing or other unusual circumstances
2) Obtain land use map and meter book
Development and Calibrate K-PIPE model
1) Work with fire/water department personnel on planning and performing flow tests
2) Obtain status of every pump and elevated tank simultaneously with the checking of
residual pressure and flow at selected locations
3) Obtain water demand for the days of flow testing
4) Prepare computer model for system
5) Calibrate computer model against flow test results
System Analysis
1) Existing system evaluation
a) Evaluate supply sources and water system components ie. elevated tanks,
ground storage tanks, pumps, and transmission lines against Texas Water
Commission Rules and Regulations, insurance industry standards, and specific
system demands using present max. day demands and an extended period
simulation which includes max. hour and fire flows superimposed on max. day
and average hour demands
b) Determine system deficiencies and potential remedial solutions
2) Evaluate future conditions and system improvements needed to meet future system
requirements (see 6a.)
3) Incorporate future requirements into present system and develop a system
improvement plan that is compatible with future system requirements
4) Prepare a cost projection and capital improvement plan to implement the selected
course of action
Report
1) Prepare final report outlining the evaluation, recommendations, and selected plan
for final approval by the city. As stated above Rady and Associates will work
closely with the city and communicate on a regular basis the status of the analysis.
2