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v 1"5 Besides replacing culverts, erosion control measures and bank stabi 1 i- zation measures would be taken. A sedimentation pond would be located above the trailer court to control debris and sediment that discharges from the mountainous area above. The approxImate costs of thIs alternative i,ns measure,d In terms of damages and improvement costs. In a 40.-ye"9r period It Is estimated that the level of damage after culvert 'improvements ",ootId be reduced 20%, to 2.6 mill Ion dollars. The costs of the Improvements and re.. moval of ImmedIate hazard structures would be approxImately 1.7 mIll Ion dollars, brIngIng the total cost to approxImately 4.3 mIllion dollars. Detention Pond. A modIfIcation of the fmproved flood plain scheme Is the Implementat Ion of the detention pond s,cheme that was found most efficIent In the hydrologIcal portIon of thIs study. Two large on" stream ponds, one located above the t ra llE,r courts and the other be 1 ow, would signIfIcantly reduce the damages In the trailer a,reas above U.S. 6 and some of the damages below. The damE,ges would be approxImately 2.2,mllllon dollars. The costs of capItal construction would be approx- Imately 2.0 millIon dollars, brIng the toti,l to 4.2 million dol'lars. Estimated Optimum Combination. The estlmc,ted optImum cllternatlve was determIned by comparIng the other proposed alternatives on a ..9ach by reach basIs. That Is, for any gIven reach, one may determine which one of the alternatIves would be more sult.,ble on a cost basis. There are three schemes whIch would be Implement'9d In flv'~ le,ngths of the Gulch. The fl rst sIgnIfIcant Improvement length would be the traJ'ler court area of reach 2 and the upper portIon of n9ach 3. The concept here would be Implementation of strict flood plaIn zoning. That Is, trail- ers wT11 not be a 11 owed to move I n to vacated spaces, whether the space Is vacated by flooding or by choIce. Private traIler court owners would be encouraged to help In a cost sharing program o'f chan- nel Improvements desIgned to remove the flc)od plaIn zoning designation. A serIes of sedImentatIon/debrIs ponds would also provIde detention storage so that peak flows would be consld'9rably abated. The prlvllte owners ,"ould share In the costs of channel Improvements and pr.)portlon- ally share the cost of detentIon storag'~ whIch benefits the OWl1ers. The local entItles would also share In thE"se costs, als well as the various culvert and debrIs storage pond Cc",sts common to other plans. If the owners choose not to make lmprovemEI11ts then the flood plain zoning would remaIn, wIth the possibIlity ,)1' the entlre, flood plalr1 area becoming eventually voId of trallel"s. Such a plan would provIde for the safety and welfare of potentlal and exIstIng downstream resIdents.