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<br />Upgrading the existing levees, especially in problem areas, should be a <br />consideration for the entire reach. <br /> <br />IlI1Jrovements <br /> <br />A plan of improvements ~as identified based upon various factors which 'include; <br />frequency of flooding, e:(tent of flooding, extent of flooded property damages, <br />and effect of flooding to downstream areas. Areas A, Sand D on the floodplain <br />map s show extens i ve un it~; in the fl oodp 1 a in for 1 arge fl ood eventsOL\<IJl:!e damages ____ <br />i'2!~ese_tQre,e at.ea,sare about equa 1; even though a~easl\ and BA have~~i c~,as_ <br />many units flooded, the depth of flooding is significantly greaterinArea D. <br />Area'-DTc'on~ect~d' Lakes) has large flooding depths an;j ttH~refore-i~' ~~nsiae~-ed <br />as the highestpriority for improvementsfrom a safety standpoint. Ar,ea B('l's.'/' <br />the second priority since it is a residential area. Area A is the third <br />priority. Area C is low priority because of minimal damages during large flood <br />events and hence no improvements are proposE!d in this area. <br /> <br />Levee protection for all areas could be considered for lesser flood events, <br />however, ttH!_,expense of adding an.additional :2 to 4 feet on levees to contain <br />the 100-yearfl,.9Q(LislTinim~1, particularly if right'-of-way is available. <br />Hence, recommendations are for 100-year improvements. <br /> <br />The maps on Sheets 2 and 3 show <br />are described in the following. <br /> <br />recommended improvements for the study reach <br />.Improvement numbers ind.icate priority. <br />"/\/" '~.{~,'-","\ r' ,t{"-~ .; <br /> <br />and <br /> <br />\"l <br />, ('" Improvement #1 - Provide stabi 1 izat'ion along the southern bank of the <br />, "IV' channel just downstream' of the Grand Avenue bridge and adjacent to the <br />0";;.11') "Connected Lakes" ar/a:'. Riprap is the preferred method of stabi 1 ization, <br />I. however, riprap matel'ial is not available at reasonabl,e costs in this area. <br />Hence,~eslo~..,.s.t!QJJJ.fLp!!fl,attened to.,iI;b horizontal to vertical and <br />these slopes should be planted in native grasses. Soil investigation should <br />be comp 1 eted on ex i s t i ng fac i 1 iti es and imp rovements made as recommended. <br />Consideration shoulj be given to relocating Dike Road to the top of the <br />levee to provide adecluate right-of-way. In addition, add 2 to 5 feet onto <br />\,,-'" ~-,~'-",~'-'-'-'-,:,'f~~' <br />the ex i s t i ng 1 evee fr om the Grand Avenue bri dge to appl^ox~rmatelY:~;9QP._feet <br />downstream. This win 'provide 100-year protection for the "Connected Lakes" <br />I. <br />area with the requ i rE,d' freeboard. I <br />'iFI " <br />/ <br />Estimated Project C)st: $220,060 to $500,000 dependant upon the need to <br />,_~~~ITEact ~~~_~xis'!jn91ev.~~,and replace poor materials.. <br /> <br />;''. -') 'i' \ <br /> <br />\ "? <br /> <br />". < <br /> <br />Improvement #2 - This improvement is a permanent levee constructed along <br />the north bank of the river from the railroad bridge downstream to the <br /> <br />_ ,r"r'" <br />IN' <br />\' <br /> <br />8 <br />