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1、6.2.3.3FarmlandProtectionWorksinZhutingRegiona)SchemeZhutinggang,theprimarytributaryofXiangjiangriver,liesontherightbankoftherivercourse,38kmfarfromthedamsite.ThecatchmentareacoveredbyZhutingsluicehasacollectingareaof389km2.Thereservoirinundationtoberesultedfromth
2、eProject,belownormalstoragelevel,willaffect2066Muoffarmlandin4villagesof2counties.Thedesignhereinisconductedbasedonthecomparisonandselectionbetweensuchtwoalternativesashighteningandpumpdrainingplushighteningpartly.ThehighteningalternativeisthatthefarmlandaboveEl.3
3、8.5mistobehightenedtodesignelevation,torealignbrooksand,toreconstructZhutingsluice.Thepumpdrainingplushighteningpartlyalternativeisthat,consideringpresentsituationoffarmlandtobeinundatedinZhutingregion,alargeparttobeinundatedwithinprotectedscopeoforiginaldykeistob
4、etreatedbymeansofpumpdrainingincombinationwithbrooksrealignmentaswellasthepartaboveEl.38.5mintheremaindertobehightenedtodesignelevation,furthermore,Zhutinggangriveristoberetreated.Basedoncomparison,pumpdrainingplushighteningpartlyalternativeisestablishedasrecommen
5、dedschemeherein.b)ProceduresandLayoutofWorksAllcurvedreachesofbrookswithinprotectedscopeoforiginaldykesaretobestraightenedtoreplacethecurve.Dykeswillbereconstructedandnewlyestablishedalongthebrooksadjacenttopumpdrainingarea.Pumpstationsandcut-offditcheswillbeprovi
6、dedinprotectedregion,wheretheseepageandwaterlogwillbedrainedoutbypumpstationshereof.Originaldykewillbeconsolidated.Thenfollowingtheprincipleofhighteningfarmland,remainingfarmlandwithelevationsvaryingfromEl.38.5mtoEl.41.0m(exclusiveofthatatEl.41.0m)willbehightenedt
7、oEl.41.0mgenerally,originalroads(includingbridges)andthechannelsnetforirrigationanddrainagewillberestoredadequately.Infarmlandregiontobehightened,thecrosssectionsofZhutinggangriverhereofwillbeslopeprotectedandconsolidated,brookshereinwillbechannelized,Zhutingsluic
8、ewillbereconstructed,floodshereofaretobecollectedthroughbrookstobealignedandtobedischargedintoXiangjiangriverthroughZhutingsluice,inthiscaseoriginaldisc
