Study on the Control Performance of Rainwater Quality in the Ini-tial Stage of Urban Runoff by New Environmentally Friendly Rainwater PassXinli Cai, Qiaodan Zhang, Bai Sun, ZhenShan Liu and ShuGuang ZhuE3S Web Conf., 136 (2019) 02044DOI: https://doi.org/10.1051/e3sconf/201913602044