Page 40 - 《水资源与水工程学报》2022年第2期
P. 40

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                 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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