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<br />With regards to the levees, measures shall be taken to exterminate burrowing animals; to provide for <br />the removal of wild growth (such as trees and brush) and drift deposits; and to repair damages caused <br />by erosion or other forces. Period ic inspections shall be made to insure that these measures are being <br />carried out. The inspections will b<~ made to be certain that: <br /> <br />. No unusual settlement, sloughing or material loss of grade or levee section has taken place. <br /> <br />. No caving has occurred on either the land side or the channel side of the levees which might affect <br />the stability of the levee section. <br /> <br />. No seepage, saturated areas, or sand boils are occurring. <br /> <br />. No riprap has been displaced, washed out, or removed. <br /> <br />. No trees or bushes are growing on or adjacent to the levt:es. <br /> <br />. Access roads to and on the levees are being properly maintained. <br /> <br />. Fences and gates are in good condition. <br /> <br />. Crown of the levee is shaped so as to drain readily and that the roadway thereon is well shaped and <br />maintained. <br /> <br />. There is no unauthorized vehicular traffic on the leve(:s. <br /> <br />~ Encroachments are not being made on the levee right-of-way which might endangt:r the structure or <br />hinder its proper and efficient fWlctioning during times of emergen:y. <br /> <br />Additional inspections will be required at each of tht: structures such as road crossings, railroad <br />bridges, and canal siphons. These inspections will bl: made to identify problems and complete <br />replacement or repairs. The inspections and repairs will be completed using existing City and County <br />personnel and equipment. As such, no identifiable manpower and equiipment costs are attributed to the <br />annual maintenance. An allowance of $1,000 per yeal' f(lr material costs should be budgeted for <br />material costs, assuming that periodic replacement of short sections of fences, riprap, lmd other erosion <br />control measures will be required. <br /> <br />Frequency and Severity of Flood Events <br /> <br />As discussed in Section !, this art:a of Logan County and the City of Sterling has been subjected to <br />severe flooding from Pawnee Cr,eek and the Pavmee Creek overflow on at least three occasions <br />including 1935, 1965 and July of 1997, and more freque:nt but less damaging lower nows. The 1997 <br />storm is estimated to have caused between $10 to $12 million in damage along the lower Pawnee <br />Creek, Town of Atwood, and Pawnee Creek overflow area. Damage County wide from this event was <br />even greater. Based on a graphical plotting of peak flood flows from previous floodplain studies and <br />an estimated flow of 3800 cfs at th,~ Cemetery (provided by CWCB based upon high water marks), it is <br />apparent that the 1997 flood was approximately the 75-Yt:ar storm at this location. <br /> <br />III -35 <br />