Temporary Barriers Project Weekly Update - May
14, 2001
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: May 14, 2001
Head of Old River Barrier (HORB):
This barrier at the HORB site is operating
normally with all six culverts open. Modeling
last week (attached) showed water levels rising
significantly with the closure of the Grant Line
Canal barrier (the study modeled the GLC barrier
as "closed" however, it wasn't actually
closed completely until May 9--hence the CDEC data
on the plots doesn't correspond well to the forecasted
stages). We are doing a new study now with
three culverts closed at the HORB. If forecasts
still show water levels above 0.0 feet MSL, we'll
direct O&M to close the three culverts (most
likely on 5/15 or 5/16). Next week, May 21st,
we plan to begin removing the HORB, as the VAMP
experiment comes to an end and exports start ramping
up.
Agricultural Barriers (Old River
near DMC, Middle River, Grant Line Canal):
The Middle River, Old River near DMC, and
Grant Line Canal barriers are installed and operating
normally(the GLC barrier culvert flap gates are
tied open, which is normal when the HORB is operating).
A boat tender will be available at the DMC and
GLC sites to assist recreational boaters in using
the boat ramp to pass across the barrier. Boat
ramp operations for the DMC and GLC barriers are
0800-1800 hours Monday through Friday and 0700 -
1900 hours on weekends and holidays.
Modeling Forecasts:
Modeling completed last week (see attachment)
showed that low-low water levels would be above
0.0 feet MSL during the May 3 - May 13
period at all of the three stations we model/monitor. Because
we closed the GLC barrier last week, we saw an
improvement in water levels above the ag barriers, which should
permit DWR to close some of the culverts at the
HORB this week.
Notes:
New modeling is ongoing today. We expect to
close three culverts at the HORB this week and prepare
to begin removing the HORB beginning next Monday.
These weekly updates are also
available for your information on our website http://sdelta.water.ca.gov/web_pg/tempmesr.html.
Tell your friends!
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 Land Management
California Department of Water Resources
Office of State Water Project Planning
1416 9th St., P.O. Box 942836
Sacramento, CA 94236-0001
Phone: (916) 653-7429 FAX: (916) 653-6077
Cell/Pager: (916) 813-6512 E-Mail: markho@water.ca.gov
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