DR9303-AG 920728ITEM C-APT[ON: ~:.....~ =~..:, -. ~. ~? =j .~ -.,~ r,,~-.. '-- . -~ .. .
Discussion and consideration of possible solutions to the Barbara Austin drainage problem at the
northeast comer of Moore and Sandy Lake Road.
EVALUATION OF ITEM: DATE: ?/~/9~
At the July 22, 1992 City Council workshop, Staff was directed to b~ng forth nn agenda item
at the next scheduled council meeting to discuss possible solutions to the drainage problem on
Barbara Austin's property. Staff' was also directed to be prepared to speak to the Texas Water
Code and have several ex~mples of similar installations. As was pointed out in the council
meeting, several prime examples of a property owner building a system to convey water through
his property are:
ConnelI-Skaggs (built 10' x 8' box culvert - 99 acres off-site)
Park Place (built 27" & 42" RCP - 30 acres off-site)
Country Estates (built 54" and 60" RCP - 27 acres off-site). .
Pecan Valley (built 24" & 33" RCP - 11 acres off-site)
Food Lion (built 30" RCP - 7 acres off-site)
The options discussed at the workshop included the following: 1) Do nothing.
2) Look at the Capital Improvement Program and possibly fund an interim solution.
3) Commit to funding the entire drainage solution.
4) Other alternatives :..~...~, ~...:...~. - ~ '
CONTINUED ON PAGE 2
BUDGET AMT. AM'r. ESTIMATI/D
AMT +/- BUDGET FINANCIAL REVIV-W BY
COMMENTS:
If Council agrees to one of the above options that may require funding,
the drainage problem and solution will have to be discussed during
the~C.I.P, discussions, later in the meeting.
LEGAL REVIEW BY: REVIEWED BY CM: ~ ~'~
PAGE 2
BARBARA AUSTIN DRAINAGE PROBLEM AT NORTHEAST CORNER OF MOORE &
SANDY LAKE ROAD
The overriding question in several councilmembers' minds was - who pays for the ultimate
system? Will it be the developers responsibility to construct this system during the development
of the property?
I will be coordinating with the City Attorney and will be in a position to answer questions
surrounding the Texas Water Code and discuss the four options at the July 28, 1992 City Council
meeting.
AUSAGE
§ 11.086. Overflow Caused by Diversion of Water
(a) No person may divert or impound the natural flow of surface waters in
this state, or permit a diversion or impounding by him to continue, in a
manner that damages the property of another by the overflow of the water
diverted or impounded.
(b) A person whose property is injured by an overflow of water caused by
an unlawful diversion or impounding has remedies at law and in equity and
may recover damages occasioned by the overflow.
(c) The prohibition of Subsection (a) of this section does not in any way
affect the construction and maintenance of levees and other improvements to
control floods, overflows, and freshets in rivers, creeks, and streams or the
construction of canals for conveying water for irrigation or other purposes
authorized by this code. However, this subsection does not authorize any
§ 11.086 WATER RIGHTS
Title 2
person to construct a canal, lateral canal, or ditch that obstructs a river,
creek, bayou, gully, slough, ditch, or other well-defined natural drainage.
(d) Where gullies or sloughs have cut away or intersected the banks of a
river or creek to allow floodwaters from the river or creek to overflow the
land nearby, the owner of the flooded land may fill the mouth of the gullies
or sloughs up to the height of the adjoining banks of the river or creek
without liability to other property owners.
Amended by Acts 1977, 65th Leg., p. 2207, ch. 870, § 1, eff. Sept. I, 1977.
~MO
TO: Alan D. Ratliff, City Manager
FROM: Kenneth M. Griffin, P.E., City Engineer ~{~'{
SUBJECT: Barbara Austin Drainage
DATE: July I0, 1992
As requested, I have investigated the drainage problem at the northeast corner of Moore and
Sandy Lake (Barbara Austin Property). The problem, as stated by Ms. Austin in her May 5,
1992 letter to the Mayor, City Council and Staff, was that the amount of water coming onto her
property, since development of property to the south of her, has created problems with erosion,
washed out her driveway and killed several large oak trees.
The ultimate solution, as identified in the Albert H. Halff Study, is the installation of a 66" RCP
pipe headed northward from Sandy Lake in the Moore Road right of way and outfalling into the
existing concrete channel on the west side of Moore Road. During a meeting with the Council
subcommittee on drainage, I was instructed to look at possible solutions to the drainage problem
as it affects the Austin property. Survey shots have been taken of the existing culverts in the
area and the existing ground on the east side of Moore Road headed northward from Sandy Lake.
The general thought was whether or not it was possible to construct a temporary ditch northward
from Sandy Lake parallel to Moore Road and have it outfall into the existing channel. The only
way to outfall into the existing channel would be to construct a portion of the proposed concrete
pipe drainage system under Moore Road to the east side of Moore Road and then cut a ditch to
outfall into that pipe.
There is approximately 81 acres of drainage area going through the Austin property. Based on
the development south of her, this is approximately 400 CFS of drainage. To construct an open
barrow ditch that would handle that much drainage would necessitate cutting a ditch with 3:1 side
slopes that would range from 4 to almost 12 foot deep. This equates to a maximum top width
of about 71 feet. Because of the large oak trees in this area, it is not feasible to construct a
channel of this magnitude on a temporary basis.
I then looked at alternative solutions. In trying to maintain a 3:1 side slope and only pick-up the
increase in drainage caused by the development of the property to the south of the Austin
property, I looked at the drainage area coming onto the Austin property that has developed
recently, i.e., the elementary school, the fire station, and the residential development at the
southeast corner of Moore and Sandy Lake Road. In a developed condition, that area contributes
about 270 CFS of water to the drainage basin. I then looked at what that area would contribute
in its undeveloped condition. If it were still undeveloped, it would probably contribute about 150
Memo to Alan D. Ratliff, City Manger
July 10, 1992
Page 2
CFS to the drainage basin. I then looked at a channel parallel to Moore Road that would
accommodate the increase in the runoff, i.e. about 120 CFS. To construct a channel with the
typical 3:1 side slopes would necessitate cutting a channel that ranges from 3.2 feet deep to 4.4
feet deep. The slope on the channel would be flat until it approached the reinforced concrete
pipe and then it would drop approximately 6 feet into the pipe. The maximum top width of the
channel with 3:1 side slopes would be about 26 foot.
I then looked at a channel section with 2:1 side slopes. The steeper side slopes are not real
maintainable, however, on an interim basis, they might be acceptable so as to not create such a
wide ditch that several large oak trees would have to be eliminated. The ditch section would
range from 3.1 feet deep to 4.8 feet deep. The maximum top width of the channel would be
about 19 feet. It also would drop approximately 6 foot into the reinforced concrete pipe.
The construction items associated with the interium solution would necessitate the excavation of
the channel, removal and replacement of the concrete paving across Moore Road to install the
concrete pipe and approximately 250 linear foot of 66H RCP coming out of the concrete channel
in a southeasterly direction across Moore Road to the location of where the earthen channel
would begin. The estimated cost of this solution would be approximately $70,000.00. This
solution does not include the cost for right of wa,,,'. Obviously, the City cannot expend funds on
private properS,. If this solution is considered for further evaluation, my recommendation would
be that we at'tempt to get Ms. Austin to dedicate all necessary right of way along Moore Road
prior to the construction of any drainage improvements in that area.
There is also a structure in the general area of where the future street would be and where the
proposal channel would be. This structure would have to be eliminated. I do not know if it is
currently being used. If it is, then that could pose a problem.
Attached to this is a sketch showing the proposed location and alternatives discussed.
I will be available to answer any questions at the council meeting.
KMG,q~d
AUSTIN
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Item 8 Discussion and consideration of approval of a
Proclamation proclaiming "National Night Out" on Tuesday,
August 4, 1992, and providing City Council support and
endorsement for the "5K/1 Mile Fun Run-Walk" on August 1,
1992, to be held in conjunction with the August 4th
National Night Out festivities, and authorizing the Mayor
to sign.
Mickey Nell of 189 Asher Court made a presentation to the Council.
Mayor Pro Tem Smothermon moved to approve a Proclamation
proclaiming "National Night Out" on Tuesday, August 4, 1992, and
providing City Council support and endorsement for the "5K/1 Mile
Fun Run-Walk" on August 1, 1992, to be held in conjunction with the
August 4th National Night Out festivities, and authorizing the
Mayor to sign. Councilman Morton seconded the motion. The motion
carried 7-0 with Mayor Pro Tem Smothermon and Councilman Weaver,
Thomas, Morton, Mayo, Robertson and Garrison voting in favor of the
motion.
Item 9 Discussion and consideration of possible solutions to
Barbara Austin's drainage problem at the northeast corner
of Moore and Sandy Lake Road.
Mayor Wolfe preceded the presentations with the procedures Council
follows in work sessions and also stated that it was the intent of
Council to address this issue in the Capital Improvement Projects
work session. Ken Griffin, City Engineer, made a presentation to
the Council concerning previous projects where developers
previously were required to address off-site drainage. Mr. Griffin
stated several options to address this problem; 1) to do nothing
and let the developer of the property take care of the problem; 2)
look at the problem in regards to our Capital Improvement Program
and possibly fund some type of interim solution as discussed in the
last workshop; 3) again, consider the Capital Improvement Program
and commit to funding the entire drainage solution as identified by
the Albert Halff drainage study~ or 4) enter into negotiations or
contractual type relationship with the property owners to work
toward an agreement of either financial participation, future liens
on the property, future assessments, escrows, reimbursements or any
type or combination of various types of funding mechanisms to take
care of this problem. Following discussion, Barbara Austin of 632
E. Sandy Lake Road made a presentation to the Council expressing
her feelings that the development to the south, consisting of 81
acres, has increased the flow of water in the drainage way that
crosses her property. It is her opinion that it is not her problem
to fix the drainage problem but rather the City's problem. Mayor
Wolfe suggested holding this item until after the Capital
Improvement Project work sessions. Consensus of Council was to
hold this item until after discussion of the Capital Improvement
Project work session.
No further action was required by Council at this time.
Item 10 Citizen's appearance by Monica Simmons to request
improvements to Shadowcrest Road and to present a
petition from residents urging immediate action.
Monica Simmons of 456 Shadowcrest presented a petition and photos
to the Council. The petition is dated May 10, 1992, but has not
been presented in waiting for anticipated repairs. Mayor Wolfe
indicated that work should be under way in about three months due
to the bid process and legal requirements. No action was required
by Council at the time.
Item 11 Presentation, discussion, and considerations of a
proposal by Lou Duggan regarding the funding for
children's programs within the city of Coppe11.
Lou Duggan, former Mayor of Coppell, residing at 517 Rocky Branch
spoke concerning alternatives to funding for children's programs.
Mr. Duggan proposed a Home Rule Charter amendment to create a
Coppell Children's Fund for children under the age of eighteen
CM072892
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