Page 40 - 《水资源与水工程学报》2022年第2期
P. 40
3 6 & ' ( ) & * + , - 2022 $
variationrangeofdesignrainfallofeachmonthcorrespondingto75% controlratewas9.72(February)
~32.05mm/24h(July);however,thecurrentannualtotalrainfallcontrolrateofNanningmainurban
area(arearatio:31.99%)isgenerallylessthan50%,anditisdifficulttoachievethetargetof75%
controlrateonlybythecontributionofgreenLIDfacilities.Toobtainthe75% controlrate ,itissugges
2
3
tedthatthestoragecapacityofthemainurbanareashouldbeintherangeof120~211m /hm;howev
2
3
er,therequiredstoragecapacitycanbereducedto30~108m /hm ifthedrainagecapacityofthepipe
2
3
linenetworkreaches70~103m /hm.Inconclusion,inordertoachievethetargetof75% controlrate
ofNanningCity ,thequantitativefunctionrelationshipofdifferentcontrolratetargetsconsideringthetem
poralandspatialdifferentiation,storagecapacityanddrainageofpipenetworkshouldbeestablishedac
cordingtothecurrentunderlyingsurfacelevel,whichisamainwaytoeffectivelyimprovetherainfall
runoffcontrolcapacityofspongecity.
Keywords:spongecity;designrainfall;annualtotalrainfallcontrolrate;spatialandtemporalheteroge
neity;storagecapacity;NanningCity
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