Evaluation and suggestion of storm water runoff delay effect from green roof systems based on 3D-GIS analysis.

本研究测试的材料涉及广泛的绿色屋顶系统，通常由排水板、人工轻质土壤和草皮制成。最小峰值径流0。仅安装排水板时为298L/min。径流系数为0。63. 最小峰值径流0。安装大面积草坪绿化屋顶系统时为093L/min。径流系数为0。30.。利用这些数值模拟了东海暴雨（2000年），并计算了部分地区的径流量。结果表明，绿化屋顶安装面积的特点是减少暴雨径流。

The material under test of this study has dealt with extensive green roof systems, typically made by drainage boards, artificial light-weight soil and turf. The least peak runoff 0. 298L/min obtained when the only drainage board was installed. The number of runoff coefficient was 0. 63. The least peak runoff 0. 093L/min obtained when the extensive green roof system with sod was installed. The number of runoff coefficient was 0. 30. Using these values, we simulated Tokai torrential rain (2000), and calculated the water runoff from some case study areas. As the results, we suggested the characteristics of green roof installed area, especially reduction of the storm water runoff.