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" "' plan formulation involves evaluatIon of the alternatives to selaet a pride. ^ further consideration 1s that if Milliken intends to pave the streets at SOme point in time, the COBt of.. 1888 expensive drainage alter- native now will end up being money wasted. Sediment from upstrea", would still be .. problem in the school yard. VIII. PLANFORMlJI.,ATION plan and an ~plBment..tion procedure for that plan. Plan Selection weeternFlo",path Lola Park Tributary - Reach ^ Alternative A2 for the Lola Park Tributary prevents upland runoff from draining through the oenter of town altogether, eliminating the need for .. Reach B alternative. A diversion ditch extending from Josephine Avenue to Dorothy Avenue on the Bouth edge of town intercepts inc~ln9 flow routing it east to the Union Pacific nailroad pond. The pond diacharge rate cannot be increased due to downstream conditions so the detention pond planned as part of the I!:o.stern Flow Path 1nIprove..ents...,uld be enlarged toaoco",odate the Lola parI< drain"g<> load. Sediment from the upstrea", fields would r.."",in in euspen- sion until reaching the detention pond. The cost of thie option is high due mostly to the fact that the s1~.. of the union ,PaciHc Railroad pond would have tobei<lcreasedsixfold. ~lternative A3 recontours Lola Park into a detention/s..dimentation pond which feede a storm sewer running under Josephine Avenue to the fire station pond. Lola Park ...,uld not be lost as a public facility. Ths park a~sphera would be r....torod followingconstructlon. Thethirdalternat1v..r..ducesflow ot sediment through town as it WQuld s~ttl~ ln Lola ParI<. All aspecte of ~lt..rnati"e A3 would be located (lntirely ..ithin city land or r1ght-of~"..y. It is also th.. least costly On the surface. Alternative A4 calls for curb and gutter and paving on Irene and Josephine Avenuea to accomodate their use as drainage"ays in transporting flow from Lola Park to the fire station pond. As a street paveMent drain..g.. alternative it should be oonsidered in a broad..r scope than the economic ~~l~y~i~ ~~~~~~t~~ (r~f~r ~o WA~t~rn Flo" path. ~lt..cnative 4). Aqain. if pave~ str....ts are in Milliken's future. money spent on another alternative no" based si~ply from economic jud9"ment ~uld be wasted. The selection of an ~prove"ent plan for each drainage way "AS based on the economic ~na11si5 and inherent advantages and disadvantages r..lated to construction. maintenance. and implementation. Alt..rnative 2 for 101'1.. Westecn Flow path involves intercepting the flow bcanching west of the Milliken El..mentary School at the Quentine Aven~e and BroadStreetint..rsection. ltunoffwaterdropatothreeculv..cts"hichoonv..y flow to s channel west of Quentine Avenue and north to an existing box culv..ct under Highway 60. In the economic Analysis. this is the least expensive solu- tion to the flooding probl..m. Another advantage is that flood wat..cs will be kept off the streets. On the negativ.. sid... Alternative 2 doee not alleviate the sediment deposition pcoblem on the school grounds. Also. the curb- opening-typ.. inlet permits dab~is to qet into th.. sump and if the c..p..city of the e~p and culverts is significantly r..duced. flood wat..r will overtop Sroad Street and inundate th.. ~st sid.. of Quentine Avenue an before. ^lternative 3 is 7b peccent more expensive than Alt..rnative 2. This option intercepts runoff from fielde south of toWn in a diversion ditch along the south oodgeof the ..lementary school grounds. The flow is directed under county RIOad 21 to a channel on th......,st side then north und..... County Ro..d 46 3/4 and in to the existing box culvert under R1ghway 60. Incoming sediment would be intercepted along with the runoff. Thie would also reduce erosion problems on the eteep streets north of Broad Street se the eroding flows would ~.. ~jv~~t~rl. Alternative 4 provides for construction of curb and gUtter and paving for Quentine Avenue. The street profile would be lowered to accomodate the 100-yeac flood disch..rge below the fir~t floor elevation of adjacent housinq. The economic analysis snowed this alternative to be th.. =oat expensive when judqed strictly fr~m a drainage standpoint. Gr..ater benefits from paved str~ets ar.. realized every day in r..duced automotive ....intenance. pollution snd noise abatement. increased public heslt~ and satety. aesthetics. s~d civic Lola park Tributary ~ Reach B Alternative B2 would route water weet out of the fire station pond to the Jit"h on the south sido of Highway 60. At the t.aure "venue riqht-ot-way ti>e flow i8 redirected north under Highway 60 acrosa the Thompson and Platte Ditch