Evaluation of the SIRMOD model for optimum furrow irrigation performance

Abstract

This study aimed to evaluate and optimize the irrigation performance of a furrow irrigation system in the Philippines using the Surface Irrigation Simulation, Evaluation and Design (SIRMOD) model. Observed infiltration using a double ring infiltrometer and water advance from actual irrigation experiments conducted on a cornfield was used to calibrate and validate the SIRMOD model in a silty clay loam soil. Simulations showed that with appropriate cutoff time of irrigation and inflow rates, water savings from 29% to 49% depending on furrow length can be realized. This study revealed that infiltration characteristics derived from infiltration data using double ring infiltrometer tests would suffice as input to the SIRMOD model to estimate advance time of irrigation in an short furrows (<100m). The SIRMOD model also showed the opportunity for water savings in furrow irrigation systems that are important inputs to irrigation development programs, subsidies, policy and decision making for farmers in the country. The same methodology can be used to optimize furrow irrigation systems in other soil conditions of farms in the Philippines and other countries.