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• Board Meeting Date: 1/22/2008
• Description: CF Section – Construction Fund and Severance Tax Trust Fund Perpetual Base Account – New Loans - Bijou Irrigation District - Empire Reservoir East Embankment Dam Repair
• Board Meetings - Doc Type: Memo

Alternative 1, No-action alternative -Following the yearly inspection of the dam by the SEO,
the reservoir was put on a fill restriction to GH 29.0, the "no-action" alternative was not
acceptable since it results in a loss of use of water.
For each of the alternatives 2 through 4, the parapet walls will be repaired. Repair of the failed
walls is an imperative part of the dam repair. Alternatives for slope protection were considered.
Alternative 2, Repair parapet walls ; improve slope protection using soil cement- The soil
cement alternative was not chosen after calculations showed the amount of wave run up (due to
its smooth nature) would be less than the required freeboard at the reservoirs. The cost for this
option was also higher than the selected alternative.
Alternative 3, Repair parapet walls ; improve slope protection using articulating concrete
blocks -The articulating block alternative was not chosen also because the cost was higher than
the selected alternative of rip rap and the surface was again smoother than riprap.
Selected Alternative 4, Repair parapet walls; improve slope protection using riprap. The project
will involve the repair of the two sections of the failed parapet wall, removal of several large
trees located near the upstream toe of the dam, and adding slope protection to sections of the dam
where trees are removed or scarps exist. The riprap alternative was chosen because it was the
least expensive and is a standard SEO practice for dam repair.
The Total Project cost is estimated to be:
Construction & Contingency $ 2,550,000
Engineering $ 95,000
Legal/Administration $ 5,000
TOTAL $ 2,650,000
The SEO has approved the design. Construction began in December. The completion date of all
phases of construction is expected to be in December of 2009.
Financial Analysis
The total estimated cost of the project is $2,650,000. District water usage is 100% agricultural.
Based on the current agricultural rates fora 30 year term, the interest rate will be 2.25%.
Table 1 is a summary of the financial aspects of the project. The CWCB loan will be repaid
from increases in the acreage assessments. The District will pay the additional 10% ($265,000)
of the project cost with a dam rehabilitation project assessment.
The District has an approved 2008 budget in which assessments were increased from $18.00 per
acre to $46.58 per acre. The increase in assessments above and beyond the amount required to
cover the new CWCB loans are to cover expenses related to canal maintenance and some
additional legal fees.