If you want to hear what a man down the bottom of a well sounds like when he is sounding off about the Nile go to the Radio 4 website and check out the Today Program for Thrsday Jun 13 around 8.50 am.
What I didn't say is that this new dam in Ethiopia will so cut sediment in the Blue Nile that the 'Red Nile' phenomenon of flood sediment meeting the White Nile and making it red will no longer happen. It is likely that Moses curse on the Nile - making it red with blood- was an excessive flood with a mass of sediment.