ST9401-CS 950501MEMORANDUM
TO: Ken Griffin
FROM: Ulys Lane ,
DATE: 5-1-95
SUBJECT: DENTON TAP ROAD; COPPELL, TEXAS
W&A NO.: 94093
Attached are our computations for the state and city criteria for
diverting the watershed. We used the state's criteria and areas
as per Kenneth Shirley's direction. For the city criteria we
deleted areas south of Spur 553 that will drain through the
private properties to Denton Creek. The system we design in
Denton Tap Road south of Spur 553 will assume the Vista Ridge
tract will take all of their area to Denton Creek without
reaching the roadway. Part of the Coppell 200 Acre J.V. tract
south of Spur 553 will drain to Denton Tap Road as shown. The
discharges are relatively high and the hydraulic grade lines are
pretty high. We may need to oversize the system we design in
Denton Tap Road to receive potential overflow from the inlets at
the intersection with the future frontage road at Spur 553. The
storm drain pipe in Denton Tap may need to be enlarged to a 54"
or 60" pipe to receive some of the area or bypass from the
state's system in a 100 year event. I believe we can make the
design work and the best solution is to divert the watershed to
the existing 10'X 10' culvert. Please call me if you have any
questions.
End of Memo
MEMORANDUM
TO:
Kenneth Shirley
FROM: Ulys Lane
DATE: 5-1-95
SUBJECT: DENTON TAP ROAD/SPUR 553; COPPELL, TEXAS
W&A NO.: 94093
Attached is the design computations for the diversion of the
watershed, the discharges, and the hydraulic grade line
calculations on the existing 10'X10' culvert. We used the runoff
coefficients and areas you asked us to use. Please let me know
if you have a problem with the hydraulic grade line. If you do,
we can look at taking a small part of the watershed to the system
we will design in Denton Tap Road. Diverting the major watershed
to the 10'X10' culvert is the solution and we need to work out
the details so it will work.
End of memo
Copy to: Ken Griffin