WA9403-CS 940708Rady & Associates, Inc.
Engineers · Architects · Planners
July 8, 1994
Mr. Ken Griffin
City Engineer
City of Coppell
255 Parkway Blvd.
Coppell, TX 75019
RE: Coppell 'CIP/lmpact Fee
R&A No. 94028
Dear Ken:
The average day, maximum day, and fire flow pressures for nodes 1405, 1406 and 1408
were faxed by Greg on July 5, 1994. The average day demand is the demand during the
average day of the year. The maximum day demand is the demand during the highest
daily water use for the year, and the maximum day demand is 3.3 times the average day
demand for Coppell's current system. The fire flow residual pressure is the remaining
pressure at a node where a fire flow demand was superimposed upon the maximum day
demand. Typical fire flows are 3,000 GPM for commercial areas and 500-750 GPM for
single family areas.
Greg also mailed the printout for the average day and maximum day pressures for each
node in Coppell's system. Computing the fire flow residual pressures will require
separate computer runs for each of the 579 nodes of the existing water system. This will
take a considerable amount of time and is outside of the current scope of services. We
will be happy to provide these additional services for the City of Coppell if you so
desire. Please contact me or Mike Weiss if you have any questions.
Sincerely,
RADY & ASSOCIATES, INC.
RJM/MRW/pb
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