Assessing the potential value of the regionalised input constraint indices for constraining hydrological model simulations in the Congo River Basin

The regionalised characteristics of a sub-basin's long-term hydrological behaviour are used as multiple constraint filters for constraining model simulations in the Congo Basin using monthly time step Pitman model. results suggest that constraints appropriate many sub-basins (≥ 20 gauging stations), but not all. Detailed examination these suggested effects high slopes (> 7%) could increase runoff ratio and Q90/MMQ (low flow index) values implementing an adjustment factor based on slope did improve some very poor results. percentage points FDC falling within simulated uncertainty band has increased from 0% to 59.6% 2.4% 39.9% Rift valley Batéké plateaux regions, respectively. Future studies ideally need range different rainfall products quantify uncertainties related inappropriateness CRU data parts Basin.