How to fill out the Irrigation Distribution System Installation Agreement? 1. Gather legal descriptions of your property. 2.Room 105 Dallas 75203 and furnish (1). Easily Create an Irrigation Contract for Your Customers Download a free irrigation contract template to establish clear service terms with your clients. ā¢ Attach proof of 5 year history of agricultural use of the property in the form of receipts, income tax, invoices, or lease agreements. Insuring Irrigation. You must give the retailer a properly completed Form 01-339, Texas Sales and Use Tax Exemption Certificate (PDF) when purchasing them.