Panoramic view of debris basin in Aguaje de la Tuna, looking from downstream.

Closeup of debris basin in Aguaje de la Tuna.

Closeup of debris basin in Aguaje de la Tuna, showing depth of downcutting.

Closeup of debris basin in Aguaje de la Tuna.

Panoramic view of Aguaje de la Tuna, showing stream channel immediately downstream of debris basin.

Exposed bedrock in stream reach.

Downcutting progressed to bedrock.

Exposed rock at the bottom of Aguaje de la Tuna.

Exposed rock at the bottom of Aguaje de la Tuna.

Aguaje de la Tuna, looking downstream from debris basin, showing exposed rock on bottom left.

Aguaje de la Tuna, in Tijuana, Mexico, showing extent of downcutting downstream of debris basin.

Aguaje de la Tuna downstream of debris basin, showing extent of downcutting.

Second debris basin in Aguaje de la Tuna, upstream from highway culvert.

Culvert in Aguaje de la Tuna, downstream from second debris basin.