R2001-120 AUTHORIZING AGREEMENT - Laserfiche WebLink

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� � � . , DEPARTMENT OF WATER MANAGEMENT Memorandum No. 2001-18 June 11, 2001 I I � TO: Honorable Mayor Howley and City Council �, FROM: Steve Garman, City Manager I, John A. Smith, Assistant City Manager for Public Services I Keith D. Alexander, Director of Water Management j�a I iv� SUBJECT: ��, Lake Decatur Sedimentation Surveys. �'� SUMMARY RECOMMENDATION: I! Staff recommends that Council adopt the attached Resolution authorizing an agreement for the , Illinois State Water Survey to conduct a sedimentation survey of the Big Creek and Sand Creek ', Basins of Lake Decatur. �' BACKGROUND: �� Attached are copies of the pertinent pages of the recently completed Sedimentation Survey of ' Lake Decatur's Basin 6 by the Illinois State Water Survey. The survey indicates that the basin 'I has lost 48% (1,346 acre feet) of its original water storage capacity due to sedimentation. The ', Basin 6 dredging project, scheduled to begin late next year, will remove all of this accumulated ' sediment, and more,by dredging 1,500 acre feet of lake bottom. ��, The Big Creek and Sand Creek areas of the Lake are scheduled to be dredged immediately after I� Basin 6, beginning in 2006 and 2010 respectively. As in the Basin 6 project, an accurate survey of the volume of sediment in these areas is required for planning purposes. The remaining areas ! of the Lake also need to be surveyed since they have not been done since 1983. At the request of ' i Staff, the Illinois State Water Survey has submitted a proposal and agreement (administered by the University of Illinois, copies attached) for accomplishing this work in 2001 and 2002. '�, POTENTIAL OBJECTION: � None anticipated. �'i INPUT FROM OTHER SOURCES: ' Illinois State Water Survey ', Homer L. Chastain &Associates. STAFF REFERENCE: Keith D. Alexander, Director of Water Management, telephone 424-2863, e-mail ' kdalexander@decaturnet.org