The ROI for an irrigation system can vary widely depending on the application, system type, and location. In general, irrigation systems can provide a high ROI, often exceeding 20-30% per annum. In agriculture, the ROI may be higher due to increased crop yields and values, while in landscaping, the ROI may be lower due to lower water savings and labor efficiency gains. By conducting a detailed cost-benefit analysis and ROI calculation specific to your application, you can determine the expected ROI and make informed investment decisions.