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v 11-4 OPERATION AND MAINTENANCE COSTS Operation and maintenance (0 & M) include the dai Iy. monthly, and yearly operations by city or county forces to maintain the hydraulic and aes- thetic qualities of the flood channel. This would include but not be '1 imi ted to: Debri s Remova I Removing sediment Trimming trees and brush Irrigation (sprinkler systems) Mowing Access path repair Fertilizing Weeding Amortization of equipment Wages and benefits to employees The following unit costs were used and developed by this office based on discussions with various entities to determine actual costs for the various alternative solutions. TABLE VI /-2 ANNUAL UN I T COSTS FOR OPE RAT I ON AI;D MA I NTENANCE Natural grasses, with sprinkler system Natural grasses, without sprinkler system Flood plains, undeveloped basin Flood plains, developed basin $800/acre $400/acre $. 201ft. channe I $. 30/f t. channe I Operation and maintenance for items such as the sediment basins were estimated on an engineering judgment basis to take care 0" small silt deposits, minor gradings, and occasional re-seeding. Normally, 0 & M for parks is closer to $3,000 per year pel" acre; however, this implies that structures, playgrounds, and other appurtenances are involved and implies extensive use of blue grass. In this regard, most of these appurtenances are directly attributable to a recrea:ion fund and blue grass is not necessary or desirable in areas of occasional pedestrian traffic. Natural grasses are attractive, wi I I remain gl"een if irrigated, \"j 11 not die if not watered, require fewer mowings, and need less water. Blue grass could be integrated into grass-lined channel alternatives, but it has been assumed that the reason for using this grass is to support heavy recreational uses. It was also assumed that the grass-lined channels would be irrigated by a sprinkler system in heavy residential areas. Further reductions in 0 & M can be obtained by not irrigating grass-lined d,annels.