University of Khartoum

Appraisal of the Water Quality of the Blue Nile, the White Nile and the River Nile for Irrigation use Zeinab Tarig Mirghani

Appraisal of the Water Quality of the Blue Nile, the White Nile and the River Nile for Irrigation use Zeinab Tarig Mirghani

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Title: Appraisal of the Water Quality of the Blue Nile, the White Nile and the River Nile for Irrigation use Zeinab Tarig Mirghani
Author: Tarig Mirghani, Zeinab
Abstract: The study was undertaken in Khartoum State, which lies between latitudes 15°8` - 16°39` N and longitudes 31°36` - 34°25` E, in the semi– desert tropics. Water samples were collected from the River Nile at Shambat bridge, the White Nile at Fetaehab bridge and the Blue Nile at Al-Mak Nimir bridge. They were obtained at the same day of each month for one year from January to December 2009. The main objective of this study was to appraise the water quality of the River Nile and its two main tributaries for irrigation use. The chemical properties (pH, ECW, Na+, K+, Ca+2, Mg+2, Cl-, CO3 -2, HCO3 -, SO4 -2 ) of the water samples were determined using standard procedures. Sodium adsorption ratio (SAR), residual sodium carbonate (RSC) and Langleier saturation index (LI) were calculated. The United States Salinity Laboratory classification system based on the electrical conductivity of water (ECw), indicative of the salinity hazard (C) and SAR indicative of the sodicity hazard (S) was used. The results showed that 41.7 % of the Blue Nile water samples belonged to the C1 – S1 (low salinity-low sodicity) class, 58.3% belonged to C2 – S1 (medium salinity-low sodicity) class. 83.3% of the White Nile water samples belonged to the C1 – S1 class and 16.7% belonged to C2 – S1 class and 83.3% of the River Nile water samples belonged to C1 – S1 class and 16.7% belonged to C2 – S1 class. Ca-Mg was the dominant cation class and CO3 and Cl were the dominant anion class. All water samples of the River Nile and its two tributaries gave low sodium hazard for the twelve months. The RSC values were negative for all water samples in all months, indicating absence of bicarbonate hazard. The LI values calculated using the actual pH values of the water samples were negative indicating absence of bicarbonate hazard. However, when the LI values were calculated using an assumed actual pH of soil solution (i.e, 8.4) 52.8% of the water samples of the River Nile and its two main tributaries were found positive indicating presence of bicarbonate hazard. All these results indicate that the River Nile and its two main tributaries have good water quality for irrigation use
Description: 137 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/9586
Date: 2015-04-26


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