PENILAIAN KRITERIA RETENSI PADA GREEN ROOF

Abstract

Utilization of green roof has increased significantly in the last ten years. The lack of green roof’s hydrological criterias to evaluate its performance in France especially is still a problem. The purpose of this study was to develop an assessment tools in FAVEUR model for predicting the green roof performance in managing rainfall excess in urban areas especially in retention criteria.In this research, the retention criteria (Ab) was calculated for different time-scales; annual, seasonal and rain-event. This criteria showed a good correlation with the interception capacity (Cint). The simulation of FAVEUR parameters variation with ncalc=500 for annual, seasonal and rain event time-schales showed the average of annual retention were between 30-470 mm, summer retention were between 218-327 mm and winter retention were between 84-143 mm. Then for rain event time schales, the maximum retention were constantly linear with interception capacity in interval 12-100 mm, the minimum retention were continuously equal0 and the average retention were between 5.13-44.46 mm.According to the correlations between the retention criteria with interception capacity, the 48 polynomial equations were created in 3 times-schales: annual, seasonal and rain event. Based on those equations, the green roof’s hydrological tools was developed on an Excel© sheet for the computation of various criteria describing the hydrological performance of green roof at 3 different time-scales. The model was used to evaluate the hydrological performance of green roof especially in retentioncriteria by varying the characteristic physic of green roof such as green roof the type of vegetation, the thickness of the substrat and the water maximum capacity of the substrat (CME).
Keywords: green roof, retention criteria, FAVEUR model, , managing rainfall excess