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BACKGROUND Chinook salmon and steelhead are important biological components of the Central Valley ecosystem. The adults spawn in many streams, the young may spend a few to several months in these streams and in the San Francisco Estuary on their way to the ocean. When the adults return to their natal streams they transfer some of the ocean derived nutrients, organic matter, and energy to the lotic foodweb. Chinook salmon and steelhead together form the basis of economically important commercial and recreational fisheries-both in the ocean and inland waters. Chinook salmon and steelhead also are important because they are part of the historic culture in the Central Valley and qualify as "charismatic macrofauna" with which the public can readily identify. This identification is demonstrated by the Feather River and American River salmon festivals that annually attract thousands of adults and children.

The Bio-Engineering Aspects of Agricultural Drainage reports describe the results of a unique interagency study of the occurrence of nitrogen and nitrogen removal treatment of subsurface agricultural wastewaters of the San Joaquin Valley, California. The three principal agencies involved in the study are the Water Quality Office of the Environmental Protection Agency, the United States Bureau of Reclamation, and the California Department of Water Resources. Inquiries pertaining to the Bio-Engineering Aspects of Agricultural Drainage reports should be directed to the author agency, but may be directed to any one of the three principal agencies.

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