. Bulletin. La science. Le sud de l'Académie des Sciences de Californie. Fig. 1. Carte des sites d'échantillonnage (dénoté par cercles ouverts) sur Tecate Creek et l'Alamar River. L'ombre (à la fois la lumière et l'obscurité) sections de segments de cours d'eau représentent les segments où l'évaluation écomorphologiques a été faite. L'emplacement de la décharge de l'Tecate le traitement des eaux usées municipales est désignée comme "payer". L'emplacement de la décharge de l'Tecate bière brasserie et l'Tecate complexe des maquiladoras sont indiqués par "brew" et "Maq" respectivement. Site adapté de la base de données SIG du bassin hydrographique de la rivière Tijuana

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. Bulletin. Science. SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 1. Map of sampling sites (denoted by open circles) on Tecate Creek and the Alamar River. Shaded (both light and dark) sections of stream segments represent reaches where ecomorphological assessment was made. The location of the discharge from the Tecate Municipal Wastewater Treatment is denoted as "WTP". The location of the discharge from the Tecate Beer Brewery and the Tecate maquiladora complex are denoted by "Brew" and "Maq" respectively. Map adapted from the Tijuana River Watershed GIS database. 2000. enforcement of existing regulations, has generated pollution that contaminates the tributaries of the Tijuana River and ultimately the Pacific Ocean. The city of Tecate, Mexico is located in the eastern section of the Tijuana River watershed (Figure 1). In 2000, the population of Tecate was nearly 80, 000 per- sons, with this number expected to increase to around 150, 000 by the year 2020 (INEGI 2000). In urban Tecate, major point sources of pollution to Tecate Creek include the discharge of poorly treated sewage from the Tecate Municipal Plant, the discharge of high BOD-containing waters from the Tecate Brewery, and ef- fluent discharge from a maquiladora complex which includes a large metal-work- ing industry and the effluent from a slaughterhouse. Due to these discharges, flow in Tecate Creek occurs throughout the year, even during the summer dry season when the stream would naturally have little or no flow. Downstream, Tecate Creek joins Cottonwood Creek in the U.S. to form the Rio Alamar (Figure 1), which eventually joins the Rio de las Palmas in Mexico to form the Tijuana River. Due to the major point sources of pollution mentioned above, as well as typical urban non-point sources, Tecate Creek may account for a significant part of the loading of a variety of pollutants to the downstream Tijuana River watershed and the Tijuana River Estuarine Research Reserve in the

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