**5.1 Sprinkler flow**

Sprinkler heads changes according to properties of cross-sectional area of orifice, operating pressure and processing property of orifice. Because of head losses, sprinkler head loses pressure as goes from beginning of lateral towards to end of lateral. Therefore decrease in flows occurs (Anonymous, 2010). Difference of maximum 10% in flow and 20% in pressure across lateral line should be allowed to provide a suitable corresponding water distribution. Sprinkler flow is calculated by help of formula below

$$\mathbf{q} \equiv \text{3600CA} \sqrt{\text{(2gh)}} \tag{10}$$

Where.Q:Sprinkler flow m3/h C:effective coefficient (0.80-0.95) A: nozzle cross-section area m2 g:gravitational acceleration m/s2 h:operation pressure of sprinkler head. m.
