Model Performance Index of Ground Water Irrigation Systems in the Karst Mountain Region: Case Study in Gunung Kidul Regency, Yogyakarta

Abstract

Ground Water Irrigation Network (GWIN) make a major contribution to agricultural production in karst mountainous areas, especially in the dry season. A performance index model would be developed to measure the level of success in developing groundwater irrigation systems. Performance evaluation of groundwater irrigation systems was a value called the Groundwater Irrigation Performance Index. This study aims to obtain determinants of the parameters of the index performance of groundwater irrigation that based on technical and non-technical aspects by analyzing the variables that give effect to the both aspects. Technical variables were physical infrastructure, supporting facilities, geological conditions, vegetation conditions, water recharge area conditions, direction of spatial planning, documentation, and crop productivity. Non-technical aspects were personnel organizations, P3A (Association of Water User Farmers'), and economic-socio-cultural. The locus of research was in the Karst Mountains area of Gunung Kidul Regency, Yogyakarta. The method used in collecting data was direct measurement of site visit and secondary data from the field. The non-technical aspects of using questionnaire data as qualitative data were converted into quantitative data. Smart Partial Least Squares was used for filtering variables. GRG-Generalized Reduced Gradient method was used to solve the non-linear equation with the objective-objective assumption and constraints. The model calibration test was calibrated and simulated on the parameters used. The results were a performance index model to measure the level of success in developing groundwater irrigation systems. The performance index evaluation of the developed groundwater irrigation system was an accumulation of technical indexes and non-technical indices involving influential variables.