Empirical modelling of green water: A case of wami ruvu basin, Tanzania

Green water supports the entire terrestrial environment, ensuring human survival and access to food. Overuse and loss of natural resources have led to a decline in green water throughout the time. The postulated causative factors of green water availability are precipitation, temperature, land cover changes, human population increase, relative humidity and sunshine intensity. Interrelationships between them at the local and global level is unknown. The study was done based on in-situ data observation from 1990 to 2020 in Wami/Ruvu Basin, and Linear Multiple Regression Model and SWAT Model were developed and applied to estimate and project green water availability in the basin by 2035. The study findings was that green water will be accessible in the basin for its sustainable management, and temperature has a comparatively greater impact in green water availability. Given that, temperature rise is mostly unchecked and is projected to climb over normal international standards, it is recommended to invest in the use of green water resources to ensure food security because a spike in temperature also results in an increase in green water.