Analysis of Placement Pattern and Number of Rain Stations Based on The Equation of Kagan Rodda in Ciliwung Watershed

Abstract

The accuracy of hydrological data is influenced by the number of rain stations in a watershed, the density and distribution patterns as well as the accuracy in recording the data itself. The rain gauge network system must be planned in accordance with the needs of the rainfall data to be collected. The placement of a rain station in a watershed (DAS) can be found using the Kagan Rodda method equation. The Ciliwung Watershed is a watershed in an area that has been developed with a high population density with a large number of rain gauges, currently there are 7 rain stations. After looking for the analysis of the placement pattern and the number of rain stations using the Kagan Rodda method in the Ciliwung watershed, it was found that 4 stations were recommended, so that the number of stations in the Ciliwung watershed became 11 stations, and the placement pattern with the Kagan Rodda triangle, the side length of the triangle is the same as the distance between rain stations. L = 7,947km.