Evaluation of water balance modeling parameters for Zawita-Swaratoka watershed

الملخص EN

Zawita-Swaratoka watershed is located in Duhok Governorate Iraqi Kurdistan Region about 20km to the north-east of Duhok city.

The study area covers about 145 Km2.

It has mean annual rainfall of about 692 mm, which falls during 59 days per eight rainy months per year.

January is the most rainy month, and reaches about 146mm.

The winter season is the most dense rainy season and reached about 54% of the annual rainfall.

The two days maximum rainfall event during eight months is 56% of the annual rainfall, which is the surface runoff.

The water surplus was found to form 52% to 78% with 17% ground water recharge from the mean annual rainfall.

The probability of return period for the maximum (725mm per year) and the minimum (255 mm per year) of the water surplus during the next year were 10% and 90% respectively, while the return period probability of the water surplus every two years was 50% between 550-725 mm per year and 50% between 255-550 mm per year respectively.