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Waterside slopes of levees are subject to erosion from wind-generated waves, boat wakes, and water flowing at high velocity. State and local governments have invested millions of dollars in the past 10 years to maintain and repair eroded levees. In some instances, the expenditures exceeded the appraised value of the island or tract being protected. The map shows the average amount of State money spent per year of participation in the State cost-sharing program (Delta Levees Maintenance Subvention Program) for the period 1981-1991. This, along with the other related information, is contained in Table 2.