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contour int"rval) 'Of Milliken to ,,,,tabUsh 100- aod 500-year flo<><lphin boun<iarte". ~conomic analysis involved estimating flood damaqe~, casts for different improvement schemes, and the amount of reduced flood dama~e as a result of the improv"ment". Both non"truccural and structural alternative" ~ere considered for each of the three drainage~ays through Milliken based on the 100-year discharge. Alternative t, the nonstructural alternative in 94ch case, considers no im- provementstothee"'istingdrainagesystem. Flood daroage reduction is accompli"hed by flood plain zoning, re"trictions to encroachments or develop- ment, evaCUation of the flood plain, floodproofing individual "tructures, or flood insurance. Several structural alternatives were developed for each of the draina- geways, keyed around solutions to the major drainage barrier in each flo~ path. A Cost ""timate for each scheme was determined and benefit-cost ratio established for economic comparison. ~sed on economic", tempered with engi_ neering judgement, a recommanded drainage improvement plan was arrived at. The ~uggested improve....nts are not bln,Ung on the community but are recO<nln<>nded. Several of the recommended solutions involve the regrading and paying of street" despite the fact that other plans were mor~ econonical from a drainage ctandpoint. It should be pointed out that the benefits of pav~u streets e~tend beyond the realm of drainage. Greater benefits from paved streats are realirad every day in reduced automotive maintenance, pollution and noise aba_ tement, increased public haalth $nd safety, aasthetics, and civic pride. A further consideration ill that if /01111110;'30 intends to pave the streets a9 some point in time, tha cost of a le99 a",pensive drainage alternative nO\< will en<1 up being money ~4sted. ~he recommended plan for each flow path is described as follows, 1.01" Pdrk ~ri.but"ry Flow ent'Hing to..n "t [,ola Park nea<is" s..fa "n<l <ii.Stinct lMth to follow to High~ay 60. Thi" coul,\ "",st beneficially be providad by paving Irene and Josephine Avenuas, aplitting tha inc~ing flo~ bet..een tham, and guiding it to a pond ~est of the fire station. Gatting flood..aters through the fllghway 60 I>o.rri..r is the key to the flooding problem on the Lola Park Tributary. It is recolllmend"d that two culverts drain the fira station pond un<iar High..ay 60 north to a "y~ shaped Josephine Avenue ~hich ..ill function as a concrete-lined channel convaying flo~ to tha Thompson and Platte Ditch. The north side of the irrigation ditch will be excavatad to the normal operating water surface elevation at the ditch "0 that flo~ in e",ceas of the &ownstream ditch capacity ..ill spill into a detention pond bat..een the Thompaon and Platte Ditch and the Great Western Railroad embankment. Culverts through the railroad embankment ~ill drain the ~ater to a ditch running into the Little Thompson Riyer. The estimate~ cost for the Lola park Tributary if $775,000. '~estern now Path problems of street erosion and flooding of homes adjacent to QuentL~e Ave~ue could best be solved by ragrading and curb and gutter and pdving tha streets effect..d. The estimated cost for tl1e ~..st"..n now Path h ~~OB,OOO. Eastern l'lo~ Path The capaCity of drainage structures along County Road 2) between the union Pacific Railroad and the Thompson "nd Platte Oitcn is limited by a narrow rlght-of-way and flat grade. Runoft.."te.. "" this side of to"'l\ must bc ",,,,,ued behind the Union ~aciflC Ra~lro.o.d <lmbanl<ment and released Slowly oo...n ditches on both sidas of County Road 23. The flo" ~il1 be recombined in the ..agt ditch at Highway &0 to flow Wider th.. high~ay to the ditch On the ....st scde of Alice AYenue. The flow continues north in the ditch to a culvert whiCh transmits the discharge to a ditch on the ""st side of Alice Avenue just n<>rth of Charry Street. This r04dside ditch convey" the "at"r to the Thompaon and Platte Ditch whare a cros8ing simiiar to that described with the Lola Park Trihutary pl~n tr~~~'ers w~ter in excc,." of ~~c irri;ction ditch c"pacity to another ditch which parallels County Road 2) north to the ai; Thompson River. The estimated coat for the Foaetern Plo... P"th is $<101,000, I\n implamentation plan h4s be..n devalop<ld ba"ed on ~j,,, """"..ay of flood damage the impro"ements will alleviate. The recommended implementation proce- dure shollld begin with lowar Lola P....k Tributary improv",cnts fro", the Ure station pond to the ~ittl.. Thompson River. The aocond priority should be Hi '"