HEC-HMS model for runoff simulation in a tropical catchment with intra-basin diversions – case study of the Deduru Oya river basin, Sri Lanka

Abstract

Abstract:Hydrological modeling is a commonly used tool by water resource planners to simulate the hydrological response in a basin due to precipitation for the purpose of management of basin water. With the increasing demand for limited water resources in every basin, careful management of water resources becomes more important. The Deduru Oya river in Sri Lanka supplies water to number of new and ancient irrigation systems and the management of water resources in the Deduru Oya river basin, which has an area of 2620 km 2 , is important for optimum utilization of water for these irrigation systems. This paper describes a case study of continuous rainfall-runoff modeling in part of the Deduru Oya basin with intra-basin diversions and storage irrigation systems using the Hydrologic Engineering Center -Hydrologic Modeling System (HEC-HMS) version 3.0.1 to estimate runoff in the Deduru Oya river.Long term daily rainfall data at several rain gauging stations, evaporation, land use and soil data in the river basin, daily river runoff at a stream gauging station, intra-basin diversions from the river into a storage reservoir, irrigation releases from the reservoir and drainage flow returned to the river from irrigation systems were used to set up the HEC-HMS model. Five-layer soil moisture accounting loss method, Clark unit hydrograph transformation method, and recession base flow method of the HEC-HMS model were used. Temporally varying irrigation water uses, storages and losses in the basin were taken into account in the analysis. The results depict the capability of HEC-HMS to reproduce stream flows in the basin to a high accuracy with averaged computed Nash Sutcliffe efficiencies of 0.80. The study demonstrates potential HEC-HMS application in flow estimation from tropical catchments with intra-basin diversions and irrigation storages. The model developed is a tool for water management in the Deduru Oya river basin.

Mid-Century Climate Change Impacts on Ouémé River Discharge at Bonou Outlet (Benin)

“…Part of the rainfall is lost through evapo-transpiration, interception of canopy and storage areas. Pervious areas are those into which rainfall infiltrates with no loss [32,33]. These are the areas that feed the baseflow.…”

“…It has been widely applied worldwide with satisfactory results. HEC-HMS is a semi-distributed model that integrates land use and cover change [11,[30][31][32][33][34], like SWAT [8,12,[35][36][37][38][39]. However, comparative study based on model's hydrological processes, governing equations used, minimum data required and spatial as well as temporal scale of both HEC-HMS and SWAT concluded that HEC-HMS has the best efficiency and lightness [40,41].…”

Importance of Hydrologic Simulation for Lids and BMPs Design Using HEC-HMS: A Case Demonstration

“…Data collection is supposed to be one of the most challenging tasks in storm water management. 1 Khaniya et al 2 have obtained several data using field observations. Table 1 provides the data of the sub-basins including its catchment area, slope, impervious percentage, curve number (CN).…”

“…Mentioned that especially, developing countries around the world are facing these problems due to lack of understanding of the dynamics of the basin water and the assessment of basin water for development use. 1 Precipitation is identified as the major source of the fresh water; however, the water washes on the surface (semi impervious or impervious surfaces) is termed as runoff. Runoff water disturbs the basin hydrology which significantly reduces the groundwater recharge which can lower the groundwater table, increase run-off peak, runoff volume.…”

“…9 The selection of the model depends on the basin and the objective of the hydrological prediction in the basin. 1 HEC-HMS uses a set of mathematical models to simulate the precipitation runoffrouting. The capabilities of HEC-HMS lie on simulation of watershed runoff and stream flows, determination of flood flows, evaluation of land use and topographic changes and computation of damage frequency curves.…”