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Effect Analysis on Rainwater Conservation Benefit of Concave Herbaceous Field in Jinan City

Effects of promoting rainwater infiltration and the impact factors of concave herbaceous field were analyzed in urban area of Jinan at different scenarios of designed rainfall frequencies, greening rates and concave depths. The capability of rainwater storage and infiltration is correlated negatively with designed rainfall frequency, and positively with concave depth, greening rate and soil infiltration coefficient. The results show that when the ratio of green space is 30% and the concave depth is 100mm, the rainwater collection rate of concave herbaceous field is 76.55% and 63.45% respectively under the rainfall of 1-year and 3-years return periods.