Gage at Chuntacala Creek, Moquegua, Peru (071016).

Lined channel at Chuntacala Creek, immediately upstream of cut (071016).

Cut through hill at Chuntacala Creek, to bypass flow to Torata Creek (071016).

Detail of cut through hill at Chuntacala Creek, to bypass flow to Torata Creek (071016).

Eroded hill at bypass to Chuntacala Creek, showing exposed rock (071016).

Dam over Rio Torata, Cuajone (071016).

Tailwater of Torata reservoir, showing sediment deposition (071016).

Detail of tailwater of Torata reservoir, showing sediment deposition (071016).

Overview of tailwater of Torata reservoir, showing sediment deposition (071016).

Tailwater of Torata reservoir, showing sediment deposition (071016).

Exposed rock in fall of bypass to Chuntacala Creek (071017).

View of fall and Torata Creek, Chuntacala Creek bypass, Cuajone (071017).

Jose Nicolas de Pierola and myself (071017).

Colluvium near Torata Creek, at foot of Chuntacala bypass (071017).

Torata Creek, seen from above, at Chuntacala bypass (071017).

Torata Creek, seen from above, at Chuntacala bypass (071016).

Overflow spillway at Villa Grande dam, Cuajone (071017).

Rio Yura at Yura, Arequipa, Peru (071018).