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The Comoro river basin is one of the watersheds in Timor Leste with an area of 212 km2. The Comoro river and its tributaries are the main surface water source for clean water needs in the city of Dili. The purpose of this study was to estimate the availability water from 4 sub watershed of Comoro using the F. J. Mock model. The Mock method is rainfall-runoff model and was used when measured discharge data is not available. The input of this model are rainfall, potential evapotranspiration, soil moisture and watershed characteristics. The result of calibration and verification of model in the upstream of Comoro watershed indicate that the value of the correlation coefficient were 0.8 and 0.7 while the volume error (VE) were 0.05 and 0.04, respectively. The parameters that was produced in the calibration of the Upper Comoro watershed are then used to estimate the discharge in the Beemos, Maloa, Kuluhun and Becora sub-watersheds due to no observational discharge data available. The dependable flow 90 % from the total of the four sub-watersheds is 0.06 m3 / sec. This shows that surface water availability is only 1,718,053.808 m3/year to meet domestic and non-domestic needs in Dili.