Alexander Ct-CS070803
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Mr. Ken 0riftiD, P.E.
City of CoppeII, F..neerinB o-.,.-buent
2SS r.kway Blvd.
CoppeII, TX 7~19
LETfER OF TRANSMITIAL:
2 sets of CC8II'UCIion drawinp for Alexander Cowl
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Tim Bennett Engineering & Construction, Inc., d.b.a. TBEC
203 N. Jackson Street
P.O. Box 2077
Wylie, Texas 75098
Phone: (972) 429-3993
Fax: (972) 429-3963
timbennett3(a;verizon.net
August 3, 2007
Ken Griffin, P .E.
City of Coppell
Coppell, Texas 75019
RE: Alexander Court
Dear Mr. Griffin,
I have informed Sempco Surveying to change note 4 on page 2 of the plat.
Enclosed is a sketch and hydraulic analysis ofthe portion of Olympia Lane just west of
the low point. The 100 year Q of 12.5 cfs is not entirely contained in the paving section.
The analysis shows that if the water were to rise to 0.1 feet above the T.C. and encroach 5
feet into the parkway, the street would convey 22.9 cfs.
With the addition of the inlets on Knights Way, the 15 foot inlet in the sag has been
reduced to a 10 foot inlet.
The standard 28 foot paving crossection has been revised on both paving sheets.
Will the radius on the property line satisfy the requirement for a 10 foot x 10 foot clip for
sidewalks on the street intersections?
The hydraulic grades shown in the profile of the storm sewer sheet have been revised to
match the hydraulic grade line.
The concrete cap for the pavement replacement for the open cut in Bethel Road has been
added.
The mark-up set from 7-23-07 is attached.
If you have any questions or other concerns, please call.
Sincerely,
~~
Tim Bennett, P.E.
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OLYMPIA LANE STREET CAPACITY
Street capacity for 28' b-b concrete street on 0.6% slope with water surface at the top of
the curb: .
n = .014
A = 5.19 SF
W p = 28.5 feet
R = 0.18
S = .006
Using Scobey chart: V = 2.3 fps
Street capacity Q = V A
= (2.3) (5.19) = 11.9 cfs
Street capacity with the water surface 0.1' above the top of curb; water encroaches 5 feet
into the parkway:
n = .015
A = 8.49 SF
Wp = 38.5 feet
R = 0.22
S = .006
Chart gives V = 2.7 fps
Street capacity Q = (2.7)(8.49) = 22.9 cfs