Evapotranspiration Measurement and Estimation of Crop Coefficient for Native Plant Species of Green Roof in the Tropics

Extensive green roof is one of the sustainable urban stormwater management alternatives to manage and mitigate surface runoff. In order implement roofs more effectively, suitable plant species substrate components for tropical climate must be identified. The aim this study investigate evapotranspiration (ET) behaviors in extensive based on different types local native species. Four test beds containing pro-mixing pot burn soils were each vegetated with Axonopus Compressus (grass) Portulaca Grandiflora (sedum). A weather station soil moisture sensors was installed measure data. results showed that mean ET rates grass-pot soil, sedum-pot grass-burn sedum-burn 1.32 ± 0.41 mm/day, 2.31 0.72 1.47 0.39 mm/day 0.43 respectively. It noted environmental parameters such as ambient temperature, solar radiation wind speed significantly positive relationship (p value < 0.01) except relative humidity. crop coefficients (Ks) studied are estimated actual reference rates. sedum planted highest coefficient (0.64), followed by (0.62), grass (0.39) (0.37), findings also better water retention capacity generally improved Ks values.