Analysis of Thermal Pollution Reduction Efficiency of Bioretention in Stormwater Runoff under Different Rainfall Conditions

The thermal pollution of stormwater runoff is an important factor in the degradation urban water environment. Bioretention effective way to control runoff. To understand influence different rainfall conditions on reduction load rainwater from bioretention facilities and correlation between parameters, experimental study was carried out by using Beijing P&C pattern change parameters. By proposing innovative evaluation index parameters analysis methods, quantified. results showed that heat rate (HR) had a strong negative with inflow volume (IV), duration (RD), service area ratio (CAR), coefficients were −0.95, −0.73, respectively. HR weakly correlated return period (RP), temperature (RT), air (At) during experiment, −0.29, 0.20, delay peak value output input about 10 min. Through research entering exiting facility, we can master some rules facilities, which will provide reference for subsequent difference internal change.