KHALID ABDELAZIZ  FLOOD waters in Sudan have reached the highest levels on record, killing dozens of people, destroying thousands of homes and encroaching on some neighbourhoods of the capital Khartoum. The flooding comes despite Ethiopia starting to fill the reservoir behind a giant new dam upstream on the Blue Nile in July. The Grand Ethiopian Renaissance Dam (GERD) is expected to help Sudan control future floods. Flooding regularly hits Sudan in summer, but this year's unprecedented water levels have left larger tracts of farmland submerged and residents around Khartoum are looking anxiously outside their homes for fear of the rising…