Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />. <br /> <br />With regards to the levees, measures sba1l 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. Periodic inspections shall be made to insure that these measures are being <br />carried out. The inspections will be 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 levees. <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 Icvee 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 levees. <br /> <br />.! Encroachments are not being made on the levee right-of-way which might endanger the structure or <br />hinder its proper and efficient functioning during times of emergency. <br /> <br />Additional inspections will be required at each of the structures such as road crossings, railroad <br />bridges, and ClIDal siphons. These inspections will be made to identify problems and complete <br />replacement or repairs. The inspections and repairs will be completed using existing City and County <br />personnelllDd equipment. As such, no identifiable manpower and equipment costs are attributed to the <br />annual maintenance. An allowance of $1,000 per year for material costs should be budgeted for <br />material costs, assuming that periodic replacement of short sections of fences, riprap, and other erosion <br />control measures will be required. <br /> <br />Frequency and Severity of Flood Events <br /> <br />As discussed in Section I, this area of Logan County and the City of Sterling has been subjected to <br />severe flooding from Pawnee Creek and the Pawnee Creek overflow on at least three occasions <br />including 1935, 1965 and July of 1997, and more frequent but less damaging lower flows. 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 of3800 cfs at the Cemetery (provided by CWCB based upon high water marks), it is <br />apparent that the 1997 flood was approximately the 75-year storm at this location. <br /> <br />ill-35 <br />