It ends with its confluence with the right bank of the Helmand river, about forty miles north of Deh Rawod.
The average annual flow or module was calculated over a period of 6 years (from 1974 to 1979) and was more or less than 35 cubic meters per second.
The period of high water occurs in late winter and the beginning of spring.
Some thunderstorms and showers are present in the dry season which account for occasional breaks in the trend.
An intermediate period (with a moderate flow rate) occurs during the cold season, from early October to early March, during which the average rate rises slowly but fairly steadily, from 7 to 15 cubic meters per second.