I have Macro question, and have enquired and discussed this topic with numerous people. My background is more in Economics and Finance, but I have a small little plot in the Waterberg Limpopo (Pecan and Cattle) and read a very interesting article if I am not mistaken 10-15 years ago in the Farmers weekly of a WITS Geography professor who did a study in +-1905. Much of the article had to do with energy and the amount of energy used for cloud formation and movement from the Coast into the central parts of Southern Africa. Energy at the time I assume was a "buzz topic" as Electricity was in its early stage.
The Professor had, among others, identified a location on the Zambezi where the Zambezi and Chobe rivers (coming from the Caprivi) meet +-40km upriver from the Vic Falls, I assume close to the newly built Kazungula Bridge?
In essence the suggestion was that by the construction a 14 meter high, controllable weir, in times of flooding the river would be able to flow along the ancient route, filling Lake Liambezi, and pushing back to Maun and back via the Boteti river ultimately filling the Makgadikgadi pans.
Building a 14m high Weir 900m wide using human and animal labor was an immense challenge 120 years ago. With modern earthmoving equipment such a task would be like building a "big farm dam"!
My question and thinking - this would create MASSIVE "evaporation pans", which would in turn raise the rainfall in especially the winter months in much of the Northern Cape, and especially Botswana moving over to Limpopo province, and ultimately raise the Average Rainfall throughout the entire Southern Africa by rough calculations 100mm-200mm per year.
I assume in the 1900's many studies were done on energy rather than Water supply, with considerably lower world populations at that time.
Today Climate change and its consequences are some of the biggest challenges facing Humanity.
By Ultimately raising the Rainfall in the entire Southern Africa, through the managed and controlled filling and utilization of the Natural 30 000 - 60 000 square km of evaporation pans more regularly, will this not lower the extreme temperatures and drought patterns Southern Africa has experienced, and by all predictions are bound to worsen and could become more extreme?
A study of such a magnitude will need much research in multidisciplinary sciences, from Archaeology to Agriculture to Economics, and a much broader field of expertise.
Could such a mammoth project not be but one small answer to a much bigger Climate Change challenge facing the Earth? (and ultimately send a bit of rain to my little farm in the Waterberg in the long dry winter months when we receive those dry West Winds - (simply by adding a bit of moisture from the vast pans Botswana are so blessed with!)
My mind has been going in circles as to the feasibility of such a mammoth, yet so cheap and easily implementable idea?