An investigation on Tikurwuha diversion headwork is carried out for this research work, and an attempt is made to understand the failure problems encountered. This research aims to identify the major causes of failures in Tikurwuha SSI schemes, including damaged diversion weir components, silting, boulder and scouring problems, offtake and divide wall issues. Investigations into the causes of weir failures can improve irrigation schemes and increase agricultural productivity. The hydraulic and hydrologic failures of the Tikurwuha irrigation project were assessed using primary and secondary data from the design document, other official documents, and reports. Moreover, hydrologic failure was evaluated by the HEC-HMS model. The HEC-HMS model, evaluated using RMSE and NSE, demonstrated excellent performance in watershed simulations, demonstrating strong predictive power and accurate matching of real data with simulated stream flow data. The hydrology analysis shows a 135.9 m3/s peak flood improvement, but structural issues like uplift pressure and impervious concrete floor necessitate education, training, and community participation for improved irrigation development. The weir recommendation includes impervious concrete floors, energy dissipation measures, accurate peak flood estimation, proper hydrologic, hydraulic, and structural analyses, GIS-based hydraulic modeling, frequent maintenance, and community awareness for future irrigation scheme planning. Farmers' involvement in irrigation system design is crucial for sustainability, but economic issues like limited support services, low input availability, and reduced crop variety hinder farmers' desired outcomes.