Analysis of Hydrological Station Rationalization in Dompu Regency

Abstract

This study aims to rationalize the hydrological station network in Dompu Regency in order to establish an efficient, effective, and regionally representative hydrological monitoring system for the watershed. The analysis was carried out using the Kagan–Rodda Method, the Stepwise Method, and the World Meteorological Organization (WMO) Density Standard. The dataset consists of rainfall observations, river discharge data, and climatological variables sourced from the Nusa Tenggara I River Basin Authority I, the Indonesian Agency for Meteorology, Climatology, and Geophysics, and the Agency for Food and Horticultural Crop Protection. The results show that the existing hydrological station network does not meet the minimum World Meteorological Organization standards for station density and spatial distribution. Based on the Kagan Method, the ideal number of rainfall stations in Dompu Regency is 19, with an interpolation error of 1.01%. Meanwhile, the Stepwise Method indicates that the correlation between rainfall stations and water level gauging station remains low. According to WMO guidelines, Dompu Regency requires at least 93 rainfall stations, 8 water level gauging stations, and 8 climate stations to meet the representativeness standards for small mountainous island regions. Therefore, additional stations are needed along with the revitalization of hydrological equipment to improve data accuracy and the operational efficiency of the network.