Dr. Julio Valdes at a settled building in Aguaje de la Tuna watershed, Tijuana, Baja California, Mexico.

Slope erosion in Aguaje de la Tuna watershed.

Discarded tires ready to be used in constructing retaining wall.

Side view of retaining wall built with discarded tires.

Up view of retaining wall built with discarded tires.

Dr. Victor M. Ponce and Andreas Koch posing in front of retaining wall built with discarded tires.

Sediment retention basin in the Aguaje de la Tuna watershed.

Discharge of treated sewage at the sediment retention basin.

Land cleared for development near headwaters of Aguaje de la Tuna.

Land cleared for development near headwaters of Aguaje de la Tuna.

Side view of retaining wall built with discarded tires.

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