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Chinaisawatershortagedroughtseriouscountries.Totalamountoffreshwaterresourcesfor2.8trillioncubicmeters(surfacewaterabout2trillionm3,groundwaterofabout0.8trillionm3),accountingfor6%oftheglobalwater,secondonlytoBrazil,RussiaandCanadaintheworld,thefourth,butpercapitaisonly2200cubicmeters,onlyaquarteroftheworldaveragelevel,theUnitedStatesof1/5intheworldin121,isaglobal13percapitawateroneofthepoorestcountries.45%ofthenationinthelandoflessthan400mmdroughtlesswaterzone,andthemorerainfallconcentratedin6to9months,accountingfortheannualprecipitation70-90%,sothewaterresourceinChinaismorethan70%ofthetemporaryofflood.Deductusehardfloodrunoffandspreadinremoteareasofthegroundwaterresources,China'srealitiesavailablefreshwaterresourcesisless,onlyabout1.1trillioncubicmetersorso,percapitawaterresourcesquantityavailableabout900cubicmeters.