Easily Create an Irrigation Contract for Your Customers. Download a free irrigation contract template to establish clear service terms with your clients.Edit, sign, and share irrigation installation contract template online. No need to install software, just go to DocHub, and sign up instantly and for free. How to fill out the Irrigation Distribution System Installation Agreement? 1. Gather legal descriptions of your property. 2. Click here to download a PDF file of the Annual Service Agreement. A maintenance agreement helps ensure that your system is working properly, delivering the right amount of water to the right places.