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1、6.2.3.3FarmlandProtectionWorksinZhutingRegiona)SchemeZhutinggang,theprimarytributaryofXiangjiangriver,liesontherightbankoftherivercourse,38kmfarfromthedamsite.ThecatchmentareacoveredbyZhutingsluicehasacollectingareaof389km2.ThereservoirinundationtoberesultedfromtheProject,belownormalstoragelevel,wi
2、llaffect2066Muoffarmlandin4villagesof2counties.Thedesignhereinisconductedbasedonthecomparisonandselectionbetweensuchtwoalternativesashighteningandpumpdrainingplushighteningpartly.ThehighteningalternativeisthatthefarmlandaboveEl.38.5mistobehightenedtodesignelevation,torealignbrooksand,toreconstructZ
3、hutingsluice.Thepumpdrainingplushighteningpartlyalternativeisthat,consideringpresentsituationoffarmlandtobeinundatedinZhutingregion,alargeparttobeinundatedwithinprotectedscopeoforiginaldykeistobetreatedbymeansofpumpdrainingincombinationwithbrooksrealignmentaswellasthepartaboveEl.38.5mintheremainder
4、tobehightenedtodesignelevation,furthermore,Zhutinggangriveristoberetreated.Basedoncomparison,pumpdrainingplushighteningpartlyalternativeisestablishedasrecommendedschemeherein.b)ProceduresandLayoutofWorksAllcurvedreachesofbrookswithinprotectedscopeoforiginaldykesaretobestraightenedtoreplacethecurve.
5、Dykeswillbereconstructedandnewlyestablishedalongthebrooksadjacenttopumpdrainingarea.Pumpstationsandcut-offditcheswillbeprovidedinprotectedregion,wheretheseepageandwaterlogwillbedrainedoutbypumpstationshereof.Originaldykewillbeconsolidated.Thenfollowingtheprincipleofhighteningfarmland,remainingfarml
6、andwithelevationsvaryingfromEl.38.5mtoEl.41.0m(exclusiveofthatatEl.41.0m)willbehightenedtoEl.41.0mgenerally,originalroads(includingbridges)andthechannelsnetforirrigationanddrainagewillberestoredadequately.Infarmlandregiontobehightened,thecrosssectionsofZhutinggangriverhereofwillbeslopeprotectedandc
7、onsolidated,brookshereinwillbechannelized,Zhutingsluicewillbereconstructed,floodshereofaretobecollectedthroughbrookstobealignedandtobedischargedintoXiangjiangriverthroughZhutingsluice,inthiscaseoriginaldisc
