HomeMy WebLinkAboutUpdate Ground Subsidence 0 =
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AW CITY OF DALY DTS � T
PUBLIC WORKS DEPARTMENT
STAFF REPORT
TO: HONORABLE MAYOR AND CITY COUNCIL
FROM: RICHARD J. FOLKERS, P.E.
ASSISTANT CITY MANAGER FOR DEVELOPMENT SERVICES
DATE: 1/25/01
SUBJECT: UPDATE ON GROUND SUBSIDENCE IN PALM DESERT
The City of Palm Desert staff and the Coachella Valley Water District staff have
cooperatively funded a high-level survey procedure using National Geodetic Survey
(NGS) guidelines.
The attached map shows the deviation from the benchmarks established in 1996. In
some locations there was settlement. The settlement ranged from 0.01 feet or 1/8 of an
inch to 0.3 feet or 35/8 inches, while there was in increase as much as 0.09 feet or 113/16
inches. There is a lot of background information on the survey procedures and the like
that we have not included, but it is available if you would like to review it.
Therefore, City staff feels that the concerns raised regarding subsidence are valid
concerns and that the City, as well as residents, visitors, businesses, institutions and
governmental agencies, need to conserve water to prevent further subsidence.
However, the minimal change over four years in ground levels at the survey points
should not be considered a threat.
' (1-eL1-7 i°fC)
RIC ARD J. ' OLKERS, P.E. REVIEWED AND CONCUR
ACM FOR D ELOPMENT SERVICES CITY MANAGER
CITY COUNCIL ACTION:
RJF/sd APPROVED DENIED
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NOES:
ABSENT:
ABSTAIN:
VERIFIED BY: AA-0
Origina] on File kits 4 �-'
Last printed 01/17/2001 11:22 AM G:\PubWorks\Sonja De La Fuente\ y DoCiimendl9'I'AFF'REPORTS\Update oil 9aHsidenee.�ec
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