I am looking for a good book on water, with an emphasis on
natural materials and ecologial techniques.
Everthing about retention,sealing ponds, creating and
maintaining springs and purifying "dirty" water.
I have read yeomans "water for every farm", and just found
out about "Earth Ponds" by Tim Matson, which is probably my next read,
altough it seems too focused on the pond aspect, while
i am really intersted in the purification aspect.