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1 I I I I I I I I I I I I I I I I OBJECTIVES 1-4 construction, estimated present worth of the operation and maintenance costs over a twenty-year period, and comparison of costs versus unquan- tified tangible benefits. Operation and maintenance costs fall into three primary categories; routine, annual, and flood-related. Routine maintenance consists of trash pick-up, mowing and weed control, and is performed several times a year. Annual maintenance consists of the repair or replacement of damaged or deteriorating sections of the boating by-pass structures, including debris removal. erosion repair, bank stabilization, and pruning of vegetation, as well as structural repairs. Flood maintenance is best described as damage repair and, as such, will not be estimated but will be addressed under reliability and structural stability. INSTITUTIONAL FRAMEWORK The ownership, maintenance responsibility and operation of the boat chute will be defined so as to eliminate uncertainties, overlapping and/or undesignated responsibilities. A framework of institutional relationships will be prepared. RELIABLE HYDRAULICS UNDER A RANGE OF FLOWS The boat chute deSign should provide reliable operation for boaters within pre-selected and reasonably chosen flow ranges. For instance, it will not be satisfactory for a large hazardous standing wave to develop at certain flows, or for currents to stray from the boating path to carry boaters into unplanned obstacles. It is planned that design would be aimed at providing reasonable boating opportunities for discharges through the chute of at least 50 cfs. At higher flows, the structure components should be free of damage and not be subject to undue siltation.