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:  July 13 , 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 but only the GLC and MR barriers are operating normally.  The flap gates on the ORT barrier culverts have been tied open as of late this morning to help improve circulation and water quality on Old River.  Water levels will be effected upstream of the ORT somewhat, so we’ll be keeping an eye on water levels and water quality to assure a good balance.

 

Modeling:

Modeling was done this week and includes the change to the ORT barrier culverts flap gates.  The modeling shows water levels dropping about 0.4 feet at the station upstream of the ORT barrier with much smaller changes at the other stations.  Low-low water levels are projected to remain 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