This document discusses furrow irrigation methods. It describes furrows as small channels that carry water down land slopes between crop rows, allowing water to infiltrate into the soil. Furrow irrigation is suitable for row crops and crops that cannot stand water for long periods. The document outlines the advantages of furrow irrigation as high water efficiency, adaptability to most soils, and relative ease and low cost of installation and maintenance. It also notes some disadvantages, such as requiring skilled labor and posing hazards to machinery operation. The document then describes different types of furrow irrigation methods, including level furrows, graded straight furrows, graded contour furrows, and corrugations.