C153726 Feasibility Study

• Contract/PO #: C153726
• Contractor Name: Tremont Mutual Ditch Company
• Contract Type: Loan
• Water District: 1
• County: Morgan
• Bill Number: SPL
• Loan Projects - Doc Type: Feasibility Study

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Alternatives Evaluated

A range of alternatives were considered including l) Don't
rebuild the west headgate, 2) Rebuild the west headgate at its
original location, 3) Completely remove the old structure and
replace it with a new structure at a better location.

A subjective evaluation of the alternatives follows:

l. Don't rebuild the west headgate:

Shareholders would be unable. to irrigate 2000 acres of
cropland. The "do nothing" alternative is not
considered feasible.

2. Rebuild the west headgate at its original location:

This alternative would leave the headgate subject to
sanding problems and possible destruction by future
floods. This alternative would be economical, but not
practical, since the life of the new structure could be
short. This alternative is feasible, but not the
preferred alternative.

3. Completely remove the old structure and replace it with
a new structure at a better location:

This would increase the cost of the project somewhat,
but with the added benefits of creating a structure
with a longer life, and with lower annual maintenance
costs. This alternative is feasible, and is considered
the preferred alternative.

Bart Woodward and Cecil Osborne provided technical assistance in
the evaluation of the above alternatives, particularly concerning
the location and configuration of the new west headgate. A
critical design issue was to keep sand from washing into and
plugging the ditch. This required that water flow over the top
of the west headgate (low approach velocity with little sand),
and out the bottom of the LP&B adjacent river dam sluice gate,
where high velocity washes the sand downstream. (See discussion
on page 3 of Appendix D.)

The Selected Project

The company has decided to completely remove the old structure
and replace it with a new structure at a better location, nearer
the north sluice gate of the LP&B diversion dam. A preliminary
layout and design is shown in Appendix E. (Construction plans

Feasibility of the Repair of the
Tremont Mutual Ditch Company Headgate
April 19, 1996

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