ST0502A-CS121009
Rhonda Adloo
From:Kyle A. Bennett <KBennett@TNPINC.com>
Sent:Tuesday, October 09, 2012 11:41 AM
To:Keith Marvin; Michael Garza
Cc:Mike Jones; Andrew Luce; Chris Schmitt; Casey McBroom
Subject:City of Coppell Drainage requirement
Keith and Mike,
We have a question regarding the City of Coppell’s requirement for drainage. My understanding is that the City of Dallas
Drainage Design Manual is to be used. In their manual, the following statement is made regarding gutter flow / inlet
location.
“Inlets shall be placed to ensure that the 100-year flow in a street does not exceed top-of-curb elevation, and
that encroachment into the travelway does not violate the dry lane requirements given in part 3.1.3 of this
section.”
Section 3.1.3 gives the following chart regarding the dry lane requirement:
Street Classification Allowable Encroachment
Minor Arterial and lower classification Maximum depth of 6” or top of curb
Principal Arterial One lane of traffic in each direction must remain open
We have two separate conditions for our projects, so we wanted to clarify the requirements.
Freeport South Parkway
Currently, the interim condition will be built, which is a 4-lane divided roadway.
o
Can we design the drainage so that in the ultimate condition (6-lane divided roadway) the dry lane
o
rd
requirement will be met by the inside (3) lane that will be built in the future or does the interim
condition need to have a dry lane?
Sandy Lake Road
The ultimate condition is being built, which is a 4-lane divided roadway.
o
Do we need to design the drainage to meet the dry lane requirement, meaning the inside two lanes will
o
be dry?
I apologize if you have given us this information before, but I cannot find any documentation on which direction we
should go. Let me know if you have any questions or comments. Thank you.
Kyle A. Bennett, P.E.
Project Manager
17304 Preston Road, Suite 1340
Dallas, Texas 75252
214.461.9867 Phone
214.587.5629 Mobile
214.461.9864 Fax
kbennett@tnpinc.com
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