Research Article
Nov 1974
Precise Dam Surveys—Los Angeles County Flood Control District
Publication: Journal of the Surveying and Mapping Division
Volume 100, Issue 2
Abstract
The Los Angeles County Flood Control District performs precise control surveys on eight concrete arch and gravity dams, five earthfill dams, and 12 major earthfill debris basins. Probable error in position of surveillance points varies generally from ±0.5 to ±0.2 mm with extreme values ranging to ±6 mm for unfavorable geometric or refractive conditions, or both. Techniques are considered excellent and optimal with base-line precisions generally at 0.5 to 1 ppm in probable error, and angular direction probable error on the order of ±0.5 sec. Standards for precision should be based on reasonable effort consistent with that magnitude of movement with adequate reliability that would induce response action if exceeded. The standards should, in addition, be dependent on the nature of the structure, associated risks, and the limitations of the site geometry comprising the precise systems.
Get full access to this article
View all available purchase options and get full access to this article.
Information & Authors
Information
Published In
Journal of the Surveying and Mapping Division
Volume 100 • Issue 2 • November 1974
Pages: 99 - 114
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: Nov 1974
Published online: Feb 12, 2021
Permissions
Request permissions for this article.
Authors
Affiliations
Don F. Keene, M.ASCE
Supervising Civ. Engr. II, Survey Div., Los Angeles County Flood Control Dist., Los Angeles, Calif
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.
View Options
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.