Create a polished Irrigation Installation Contract with Venngage's customizable template. Edit text, colors, fonts, and more.Customize and Download this "Irrigation Installation Contract". Irrigation: The Contractor Shall: 1. Install a pre-designed irrigation system for the converted landscape acceptable to the SNWA. 2. How do I fill this out? To fill out this agreement, gather all necessary property details and subdivision plans. Below you will find all the on-site septic applications, forms, and informational guides to assist in your on-site project.