REFERENCES

1- Dr. Yassin Abdel Salam El Hajaz (Associate prof. of Hydrogeology) International University of Africa E-mail:   hajazdr@yahoo.com.

2- Dr. Abdallah Jumaa Farwa (Associate Prof. of Geophysics) University of Khartoum. Phone 00249 912146909.

3- Dr. Omer M. Kheir (Associte Prof. of Hydrogeology) Chief of the Sudan National Geological Council.

4- Dr. Hamid Omer (Associate Prof. of  Hydrogeology) Hydro-Master Company Khartoum.