Extreme meteorological and hydrological phenomena, including high air temperatures and rainstorms, are becoming increasingly dangerous, causing floods and inundations, as well as long periods without precipitation, which lead to droughts. Green roofs may be one of the possible measures providing solutions to these problems. Rainfall, runoff and water quality data from three different intensive green roof models covered with wildflower meadows (WFs) over 20 months have been analysed to establish the extent to which the type of drainage layer affects hydrological performance. The field experiment was conducted at the Warsaw University of Life Sciences Water Centre park from November 2019 to November 2021. The monitoring of the quality and quantity of runoff was carried out on three models of green roofs incorporating wildflower meadows with drainage layers of 2 cm (WF 1) and 4 cm (WF 2) of polypropylene mat, as well as 6 cm of chalcedony (WF 3), in an urbanized area under moderate climate conditions. The model with the 4 cm polypropylene mat drainage layer retained approx. 6 % more rainwater compared to the model with the one made of chalcedony, and 4 % more than the one with the 2 cm polypropylene mat. Phosphates were detected in most of the leachates from all the wildflower-covered green roof models at 0 ÷ 0.459 mg PO4-P/L, 0 ÷ 0.402 mg PO4-P/L, and 0÷0.360 mg PO4-P/L for WF 1, WF 2 and WF 3. This may suggest that the type of drainage layer was not an important source of phosphates in the leachates.

高温和暴雨等极端气象和水文现象变得越来越危险，导致洪水和洪水，以及长时间无降水导致干旱。绿色屋顶可能是解决这些问题的可能措施之一。对野花草甸 (WF) 覆盖的三种不同集约化绿色屋顶模型 20 个月内的降雨、径流和水质数据进行了分析，以确定排水层类型对水文性能的影响程度。现场试验于2019年11月至2021年11月在华沙生命科学大学水中心公园进行。径流水质和水量的监测在三种排水层为2厘米（ WF 1) 和 4 厘米 (WF 2) 聚丙烯垫，以及 6 厘米玉髓 (WF 3)，位于气候条件温和的城市化地区。具有 4 厘米聚丙烯垫排水层的模型保留了大约 与采用玉髓材质的型号相比，雨水多出 6%，比采用 2 厘米聚丙烯垫的型号多出 4%。所有野花覆盖的绿色屋顶模型的大部分渗滤液中均检测到磷酸盐，磷酸盐浓度为 0 ÷ 0.459 mg PO4-P/L、0 ÷ 0.402 mg PO4-P/L 和 0÷0.360 mg PO4-P/L（WF） 1、WF 2 和WF 3。这可能表明排水层类型不是渗滤液中磷酸盐的重要来源。