HomeMy WebLinkAboutLAKE SHERWOOD - Filed CS-COMMENT SHEETS - 2004-08-13H: hfI ANIM
DIVISION OF WATER RESOURCES
Departrneut of Natural Resources
300 Columbine Building
1845 Sherman Street
Denver, Colorado 80203
Administration (303) 892-3581
Ground Water(303) 892-3587
March 101, 1976
Sherwood Reservoir Company
c/o C. L. Terrell, Seer.
State Board of Agriculture
Colorado State University
Fort Collins, CO 80523
Re: Nelson Reservoir
W. Div. 1 W. Dist. 3
Gentlemen:
C..1. KUIPER
$faro En��inOgi
On Marcie 8, 1976, a member of our Dams and Reservoirs Branch, accompanied
by Mr. Donald Parsons, engineer with the City of Fort Collins, inspected
the above referenced dam in accordance with Chapter 37-87-107 of the
Colorado Revised Statutes 1973, as amended, which states,
"Amount of water to be stored - The state engineer shall
annuallv determine the amount of water which it is safe to
impound in the several reservoirs within this state, and it
is unlawful for the owners of any reservoir to store in said
reservoir waaor in excess of the amounr So derernnned by
the state engineer to he safe."
During that inspection, the following items were noted that require your
attention:
I. Our preliminary analysis of the watershed above this
reservoir confirms that the emergency spillway is of
inadequate size to discharge even a low hazard location
s term.
2. Some questionable areas were noted on the concrete
facing and numerous cavities were seen behind the top
of the concrete facing. The upstream protection of the
dam needs to be inspected for adequacy and repaired
where required.
Sherwood Reservoir Company - 2- March 12, 1976
in order to bring your dam up to current state safety standards, you should
retain the services of an engineer registered in the State of Colorado to do
the following:
1. Make a hydrologic study of the drainage area tributary
to the reservoir and determine the required spillway
size using the Bureau of Reclamation's criteria set out
in their publication Design of Small Dams, second
edition, dated 1973. Once the required spillway size
has been determined; your engineer should prepare
plans and specifications for the spillway construction
and submit these to this office for review prior to con-
struction of the spillway.
In preparing the design for the spillway, your engineer
Should review the topography of the reservoir shoreline
to assure t1lat flood flows will follow the established
spillway channel rather than spilling over the natural
terrain at the north side of the reservoir where the
flood water could cause considerable property damage.
2. Inspect the concrete facing on the upstream slope and
recommend procedures for carrying out the necessary
repairs .
Upon checking our files, our office personnel did not find any record of con-
struction, plans or specifications, a filing map or a decree. In order to
comply with the safety requirements, the following information is requested:
1 . A set of "as -built" drawings showing the items called
for on page 21 and 22, items 1 thru 7, except for item 2,
of the enclosed "Manual of Rules and Regulations".
2. A capacity table or curve must also be furnished show-
ing the capacity in acre-feet for each foot of depth.
The "as -built" drawings and the spillway upgrading could be combined in
one set of drawings. If you wish to use the reservoir to its maximum design
capacity in the future, you should submit to the State Engineer's Office by
April 15, 1976, a plan to correct the above mentioned deficiencies.
Members of this office will be available to discuss the required work with
you or your representatives.
Sherwood Reservoir Company -3- March 12, 1976
tf you have any questions, please contact our Dams and Reservoirs Branch of
this office.
Very truly yours,
D Jeris A. Danielson
Detuty State Engineer
JAD:JTS:cam
cc: W. G. Wilkinson, Div. Eng.
John Neutze, W.C.
Arthur Ditch Company
Donald Parsons`
Enclosure
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