2.5. Rainwater Harvesting System Modelling
The basic water balance model is utilized to determine the hydrological parameters of the RWH system.
Hypothetical cases of average RWH systems and average households are used for the system calculations.
The system values for each case type are chosen to represent the real-world systems in Colombo City.
This study calculates the water demand for both outdoor and indoor, small to large average households and the potential runoff from the catchments. These values are then applied to the water balance model and subsequent water security analysis.