The effect of low impact development facilities on evapotranspiration in an outdoor space of urban buildings

•ET rates of an OSUB with LID were in-situ measured by Three-temperature model.•The LID facilities have higher ET than the traditional surfaces in wet seasons.•The ET increase by LID is higher in OSUB with higher solar radiation and no shadow.•Vegetated LID has a higher ET for a longer time after rain than traditional surfaces.•LID increases the ET rate of OSUB by 51% and the annual ET in built-up area by 11 mm.