Practical Research on the Application of Sponge City Reconstruction in Pocket Parks Based on the Analytic Hierarchy Process

Table 2

Comparison of the advantages and disadvantages of various sponge transformation measures.

Retrofit measures	Advantage	Disadvantage
Permeable pavement	Timely absorption of ground rainwater to avoid the formation of water accumulation and waterlogging	Large amount of construction works and high maintenance cost
Grass ditch	Low construction and maintenance costs	Larger venue restrictions
Sunken green space	Wide application range, effectively alleviating rainwater pollution	Affected by the terrain, the operating storage volume is small
Rain garden	Simple and convenient construction technology and easy management later	Plant selection is more limited
Plant selection is more limited	Convenient construction and simple maintenance	Plant selection is more limited
Green roof	Reduce rainwater runoff discharge and alleviate rainwater pollution	Limited use conditions, not suitable for sloped roofs
Artificial wetland	The function of absorbing rainwater is better, and the formed ecosystem can purify rainwater	Plant selection is more limited
Rainwater circulation system	Improve the rainwater reuse rate and reduce resource waste	Large amount of construction works and high maintenance cost
Rainwater storage system	Reasonably adjust the rainwater treatment path	Large area and high maintenance cost
Rainwater pipeline transformation system	Discharge of rainwater in time to essentially solve the problem of waterlogging	The construction is difficult, the amount of work is large, and the cost is high