Extract of a map of the valley of San Rafael, dating back to 1864, showing the two oval-shaped marshes which gave its present name to the Ojos Negros valley. These marshes have now all but disappeared due to groundwater depletion (Zárate Archives, Ensenada, Baja California).

CONTENTS

1. INTRODUCTION 2. PHYSICAL SETTING 3. SOCIAL AND ECONOMIC SETTING 4. SUPPORTING STUDIES 5. MODELING 6. CONCLUSIONS AND RECOMMENDATIONS 7. REFERENCES