DR1101-CS140223�� �`� V
IRVING
T � X A S
February 21, 2014
John Rutledge
Freese &Nichols, Inc.
4055 International Plaza, Suite 200
Ft. Worth, TX 76109
Dear Mr. Rutledge:
The City of Irving and Irving Flood Control District #3 (IFCD #3) understands that the City of Coppell has
extenuating circumstances that make it difficult for them to drain North Lake down the south fork of Grapevine
Creek, which is in its normal drainage basin. Archer Western Contractors, the contractor for Coppell has
requested that they be allowed to siphon water over the saddle dam into Valley Ranch. The City of Irving and
IFCD #3 have reviewed the request. Although there are several areas of concern for the City of Irving, the
contractor will be allowed to start the syphon process. However, if any of the following events occur, the
syphoning will be stopped.
1. If silt begins to flow from the syphon.
2. The lake water from the syphon begins to stink.
3. The syphon creates any noise that irritates the neighbors.
every night from 6:00 p.m. until 7:00 a.m., and weekends.)
4. If water splashes onto the road.
5. If a rain event occurs.
(This may be conditional with flows halted
The City of Irving will require a hold harmless letter from the contractor if the syphon operation is halted.
The right to drain North Lake into Valley Ranch does not exist. Valley Ranch is not in the drainage area of North
Lake and this syphon operation is a conditional privilege granted by the City of Irving and IFCD #3 for this single
request.
If the Elm Fork of the Trinity River rises during a flood event and IFCD #3 must close its sump gates, then all
syphoning will halt, until the river has receded. The maximum flow allowed through the syphon is 20 cubic feet
per second (cfs). Once a rain event occurs, the syphoning will be stopped within one hour. For any other event
the syphoning will be stopped within 2 hours. If time limits are imposed, they must be followed stringently.
If you have any questions, or need to contact the City of Irving for this project, please call my cell at (817) 789-
8280, Gary Hamman, Engineering Inspector at (972) 345 -2941 or Dallas Burke, Operations Manager IFCD #3 at
(972)978 -8676.
Sinc ly,
Garry Fenne .E., CFM
Senior Civil Engineer
cc: Ramiro Lopez, Public Works Director
Casey Tate, CIP Director
Wayne Lee. P.E., City Engineer
Jacky Knox, Manager ICFD #3, P 0 Box 140035, Irving TX 75014 -0035
Keith Marvin, Assistant Director of Public Works, City of Coppell, P.O. Box 9478, Coppell, TX 75019
City of Irving � 825 W. Irving Blvd. � Irving,TX 75060 I (972) 721 -2600 � www.cityofirving.org