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Tidal Marshland Elevations in San Francisco Bay, California: Historic Accounts and Surveying Results (abstract)

by Kent G. Dedrick, California State Lands Commission, Sacramento, CA, USA,



Document Type: Proceeding Paper

Part of: Coastal Zone '87

Abstract:

The task of determining public agency jurisdiction in present and/or former tidal marshlands of San Francisco Bay is of importance in land use decisions and wetlands conservation. Jurisdiction often depends upon the marshland elevation (in its historic or natural condition) relative to a high water tidal datum such as Mean High Water. Methods used in such determinations are the subject of the paper described in this abstract. Early federal topographic maps have long been an important tool in such studies. Historic writings, eyewitness accounts, old horizontal survey field notes, and some recent elevation survey results are increasingly used in addition to the maps. Major artificial events and conditions. Historic accounts that described marshland character seem to be based upon field examinations inadequate to resolve the jurisdictions question. Marshland elevation surveys differ greatly in degree of detail surveyed, closure error, and use of tidal bench marks for reference elevations.

Subject Headings: Geodetic surveys | Surveys (non-geomatic) | Tides | Mapping | Jurisdiction | Bays | Water level | California | United States

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