Home > Crops & Livestock > Crops > Irrigation > Irrigation Flow Measurement [Image: Recording flow] Measuring irrigation flow helps irrigators better manage and schedule irrigation. Measuring flow also is a tool for estimating irrigation water use. This publication will help irrigators learn to select, install and use propeller and ultrasonic flow meters as well as estimate flow without the aid of flow meters. Subsurface Drip Irrigation in the Southeast [Image: SDI Setup] This fact sheet is designed to provide a brief introduction to the site selection, design, installation and management of subsurface drip irrigation (SDI) in humid and sub-humid areas. This overview is not intended to give all the information necessary for a complete and functional system. The reader is referred to more comprehensive documents for greater details in each category.