The aim of this work is to study application of water requirements for scheduling irrigation water of snap bean in order to save irrigation water. An other objective is to study direction of soil water under the running scheduling in the drip irrigation system. This work was carried out at soil and water research department of nuclear research center in Egyptian atomic energy authority. Fifteen neutron calibration curves of three sites (0,12.5 and 25 between drippers) were done. Three applied irrigation water rates (100, 75, and 50 percent ETc) were used. Horizontal and vertical movement of soil water was studied along the emitter lines (between drippers) at the dripper, 12.5 cm and 25 cm distance from the dripper. Yield of snap bean, water use efficiency and evaluating drip irrigation system were studied too. The investigated data pointed that direction of soil water movement was useful for defining the depth of collection of active roots for water absorption and active rooting depth. These parameters were clear in effecting on water movement under 100 and 75 percent ETc treatments. Under 50 percent ETc treatment, active roots for water absorption were only clear. There was no significant difference between yield of 100 percent ETc and 75 percent ETc treatments, whenever significant differences between (50 percent ETc & 100 percent ETc) and (50 percent ETc &75 percent ETc) were found. 75 percent ETc treatment saved about 25 percent from applied water in the first treatment. The second treatment is the best water treatment in water saving and good yield. Water use efficiency was the highest in 50 percent ETc, but economically, 75 percent ETc was the best one. As for emission uniformity of drip irrigation system was highly (92 percent).