Rainfall-Runoff Simulation for Water Availability Estimation in Small Island Using Distributed Hydrological Model wflow

Abstract

Hydrological data in Indonesia, especially in the small islands, is minimal, including spatial distribution and temporal completeness. It will affect the accuracy of water availability estimation for water resources management interest. One of the solutions that can be undertaken is applying rainfall-runoff modeling to obtain the discharge value at a specific location. This study aims to determine surface water availability in each sub-catchment of the small island by implementing the hydrological model. The wflow model is applying to perform the model. This model uses input data including Digital Elevation Model (DEM), landuse, soil, Leaf Area Index (LAI), rainfall, evapotranspiration, and observation of river discharge for the calibration process. As a result, this island consists of 30 catchments with some potential catchments, namely Cao, Sakita, and Tatamo, that have a 90% dependable flow of 4213.3 L/s, 3803.6 L/s 8117 L/s, respectively. The result of water availability in Morotai Island is highly expected to be the reference for water resources management, especially for tourism and urban development.

Hydrological Modelling for Reservoir Operation: Application of SWAT Model for Kalu Ganga Catchment, Sri Lanka

“…However, the availability of river flow gauging stations is limited in the country. Thus, the common practice adopted to overcome this issue is to convert the available rainfall records in catchments to river flows based on hydrological models [12]. These have been mainly conducted using computer models which offer advantages for economic savings in terms of time efficiency and resource utilization since they are capable of representing processes that occur in the real world in space and time [12].…”

“…Thus, the common practice adopted to overcome this issue is to convert the available rainfall records in catchments to river flows based on hydrological models [12]. These have been mainly conducted using computer models which offer advantages for economic savings in terms of time efficiency and resource utilization since they are capable of representing processes that occur in the real world in space and time [12]. The success of such models heavily depends on the extent to which the available rainfall data can represent actual rainfall over the catchment.…”