ST0501-CS080331
(8/15/2011) Keith Marvin - Deforest Court/Windsor Estates DrainagePage 1
From: Keith Marvin
To:dchovan@halff.com; Spann, Quinn; wskipwith@halff.com
CC:Baskins, DiWanna
Date: 3/31/2008 5:14 PM
Subject: Deforest Court/Windsor Estates Drainage
Dennis and Walter,
I know this is reaching back a few years, but we need a little help. The City of Coppell has hired Quinn Spann with GSWW
to design some improvements to Deforest Road. We will be rebuilding the portion from MacArthur Blvd to the concrete
portion constructed with Windsor Estates.
We hope to preserve as much of the drainage system within Deforest as possible. We have some specific questions that
we are looking for answers to that I am unable to find in city records. We would like either meet with you to talk through
these, or see if you can provide any insight on the following:
1. Can you provide us with copies of your computations for the design of the detention pond in Windsor estates?
2. There is a change in the HGL elevation at the downstream end of the pipe at the referenced pond between the Windsor
Estates plans and the Deforest Court plans. Was there something that happened that caused this(LOMR, flap gate, etc...)?
3. The Villages of Coppell DA Map shows two DA's that discharge to the Deforest Road ROW within the limits of the
drainage system built with Deforest Court. This water is not reflected in the Deforest Court plans.
Any insight you can provide in these areas would be helpful.
Thank you.
Keith Marvin, P.E.
Project Engineer
(972) 304-3681