The following report on the Temporary Barriers Project is for your information and action, as appropriate.  This report will be transmitted whenever changes occur to the operation of the barriers, and as a result of modeling and/or field monitoring of water levels in the south Delta.


STATUS AS OF:  September 7 , 2007

Head of Old River Barrier (HORB):

The Spring HOR barrier has been completely removed.  The HOR barrier will be re-installed in the fall upon request by DFG.


Agricultural Barriers (Old River near Tracy [ORT], Middle River [MR], Grant Line Canal [GLC]):

All agricultural barriers are in place with the GLC and MR barriers have been operating normally.  On Thursday, flap gates on three culverts at the ORT barrier were tied back open to help maintain adequate water quality upstream.  Next week, as the next neap tidal cycle begins, we may elect to tie open more flap gates to help maintain adequate water levels.  A total of six culverts now have flap gates tied open (allows tidal flows to move both ways) and three have flap gates untied (opening and closing with the tides).  We will continue to monitor water levels and quality, and adjust the status of the culvert flap gates depending on conditions.

 

Modeling:

Modeling was done to monitor water levels at various locations.  The modeling shows water levels remaining above the level of concern at the ORT, and GLC monitoring stations (0.0 feet MSL) and the level of concern at the MR station (0.3 feet MSL).

 

Modeling Outputs:

Middle River at Howard Road Bridge
Doughty Cut above GLC Barrier
Old River near Tracy Road Bridge


Notes:

 


These weekly updates are also available for your information on our website:

http://baydeltaoffice.water.ca.gov/sdb/tbp/index_tbp.cfm

 


If you know of anyone else that should be receiving this update, please let me know by email, and I'll add them to the mailing list.  Thanks!

 

Mark A. Holderman, P.E.
Chief, Temporary Barriers Project and Lower San Joaquin
Bay-Delta Office

California Department of Water Resources
1416 9th St., P.O. Box 942836
Sacramento, CA 94236-0001

Phone: (916) 653-7429  FAX: (916) 653-6077
Cell/Pager: (916) 601-6036 E-Mail: markho@water.ca.gov