[BwanaNdege]

BwanaNdege notes above (#23) that the Nile kicks 1,400 cubic meters per second into the Mediterranean. It's a wild guess, but due to Lake Nasser's surface area and the length of the river, and based on some old rules of thumb (I've got a big thumb collection), evaporative losses are probably about twice that.

"The flow rate of the Bahr al Jabal (White Nile) at Mongalla, South Sudan is almost constant throughout the year and averages 1,048 m3/s (37,000 cu ft/s). After Mongalla, the Bahr Al Jabal enters the enormous swamps of the Sudd region of South Sudan. More than half of the Nile's water is lost in this swamp to evaporation and transpiration. The average flow rate of the White Nile at the tails of the swamps is about 510 m3/s (18,000 cu ft/s)." https://en.wikipedia.org/wiki/Nile

IRRC, the Jonglei Canal was intended to bypass much of the Sudd and increase the amount of water delivered downstream. https://en.wikipedia.org/wiki/Jonglei_Canal

[SunkenCiv]

Thanks, good info.

There used to be a navigable canal, cut right through the Sudd, and maintained by periodically bashing the barges against the encroaching banks.