PHAUCET stands for Pipe Hole and Universal Crown Evaluation Tool. This computer program was developed by the U.S. Department of Agriculture–Natural Resources Conservation Service to improve the efficiency of existing furrow-irrigation systems. Farmers can use PHAUCET to determine the best size holes to punch along the length of a polypipe irrigation set. The tool calculates these hole sizes based on pressure changes along the tubing, pipe diameter, the different row lengths that will be encountered along an irrigation set, and the elevation changes in a field. Use this document to get your basic PHAUCET questions answered.