Table 4 shows the average annual discharge of Zonouz river since 1997-2006.Its discharge reached to 0.289 in 2002.Table 5 concerns to annual average discharge of Zilber. Its discharge was estimated one cubic meter per second in 2002.The dischrge of these two rivers which are located at the same area,were compared.We understood that the discharge of Zilber is more than Zonouz.It is because the basin of Zilber river is larger than Zonouz river basin.