HEC-HMS model for runoff simulation in a tropical catchment with intra-basin diversions – case study of the Deduru Oya river basin, Sri Lanka
by D.S. Sampath,S.B. Weerakoon and Srikantha Herath
-
Application of hydrological modeling: This research paper focuses on the application of hydrological modeling techniques for water resource management in the Deduru Oya river basin in Sri Lanka.
-
Utilizing the HEC-HMS model: The study employs the Hydrologic Engineering Center - Hydrologic Modeling System (HEC-HMS) version 3.0.1 to simulate continuous rainfall-runoff processes and estimate runoff within the Deduru Oya river.
-
Data integration and model setup: Long-term daily rainfall data, evaporation data, land use information, soil data, river runoff data, diversions, irrigation releases, and drainage flow are integrated into the HEC-HMS model to accurately represent the hydrological processes within the basin.
-
Modeling techniques and capabilities: The HEC-HMS model incorporates advanced techniques such as the five-layer soil moisture accounting loss method, Clark unit hydrograph transformation method, and recession base flow method. It successfully reproduces stream flows in the Deduru Oya basin, with an average computed Nash Sutcliffe efficiency of 0.80.
-
Implications for water resource management: The study highlights the potential of HEC-HMS as a valuable tool for water management in tropical catchments with intra-basin diversions and irrigation storages. The developed model aids in the efficient utilization of water resources in the Deduru Oya river basin.
