Urban waterlogging disasters frequently occur in China in recent years

and “Seeing the Sea” is very common in the rainy season. However

there is no unified evaluation index system to assess the degree of urban intrusion. In order to get a more complete evaluation index system of waterlogging degree of sponge city

the concept of the momentum of waterlogging potential energy was introduced based on the dynamic duration characteristics of urban intrinsic temporality. The indexes system for the evaluation of urban intrinsic degree

including the local indicatory instantaneous index

the local indwelling comprehensive index

the regional overall indifference index standard value

and the corresponding calculation and analysis methods were established. The Zhongjiao Future City in Fenghua District of Ningbo City was taken as a case. The SWMM model was used to calculate the intrinsic conditions in the region. Results show that the calculated local indwelling comprehensive index can effectively reflect the degree of internal flaws and the internal flaw design of the city. The value could evaluate the degree of the city’s overall internality. The calculated average of the region’s overall internal level can describe the overall rationality of the flood prevention design of the LID (low-impact development) measures

and the index system can effectively reflect the spatial and temporal distribution characteristics of the internal plutonium. Adopting dimensionless quantity

the evaluation method is proved more scientific.