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: April 30, 2013
The is our first TBP update of the season. Neither the Head of Old River barrier rock barrier nor the non-physical barrier was installed this spring and agricultural barrier installation has not yet started.
Head of Old River (HOR) Barrier:
Spring Head of Old River barrier will not be constructed in 2013.
Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):
Provided that all permits are received before May 2, 2013 construction of the south Delta temporary rock barriers at Old River near Tracy, Middle River, and Grant Line Canal is scheduled to begin on May 6, May 13, and May 20, respectively. Closure of the Middle River barrier is scheduled for May 17 followed by Old River Tracy on June 4, and grant Line Canal on June 11, 2013. This is an accelerated construction schedule.
Environmental Permits Compliance Reporting:
Preconstruction nesting raptor surveys have been conducted to determine the proximity and locations of nesting raptors in the vicinity of the TBP construction. Nesting Red-Tailed Hawks, Swainson’s Hawks, Great Horned Owls and other birds have been documented near the barrier construction sites. Surveys and monitoring have been and will continue to be conducted based on environmental permit requirements.
Water Quality Monitoring:
Water sampling is scheduled to begin as soon as the barrier construction begins.
Water Levels and Water Quality Notifications:
It is discovered that flap-gates at Tom Paine Slough siphons are in need of replacement. DWR is in the process of procuring and installing the new flap-gates as expeditiously as possible. In order to protect water level in Tom Paine Slough, Pescadero Irrigation District siphons are being stopped and started with tides until the repair is complete.
Modeling results are attached and forecasted minimum water levels will drop below target levels at all three monitoring locations.
Water levels for the forecast period are as follows:
Middle River at Howard Road (sta MHR) – Actual low water levels are currently 0.5 ft above the modeled forecast. Modeling shows water levels will drop to -0.7 ft (1.0 ft below the target of 0.3 ft) on May 2, 2013 then rebound to approximately -0.3 ft through the remainder of the forecast period.
Old River at Tracy Blvd. (sta OLD)– Actual low water levels are approximately 0.5 ft above the modeled forecast. Modeling shows water levels will drop to -0.7 ft (0.7 ft below the target of 0.0 ft) on May 2, 2013 then rebound to approximately -0.3 ft through the remainder of the forecast period.
Doughty Cut (sta DGL) – Actual low water levels are approximately 0.4 ft above the modeled forecast. Modeling shows water levels will drop to -0.5 ft (0.5 ft below the target of 0.0 ft) on May 2, 2103 then rebound to approximately -0.1 ft through the remainder of the forecast period.
Real-time south Delta water level data is available on CDEC at the URL below:
These weekly updates are also available for your information on our website:
We recently moved this email list to a new list server, and this is the first message to the list. The new server has enhanced capabilities. Anyone can subscribe or unsubscribe to the list by clicking the link below:
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Jacob McQuirk, P.E.
Temporary Barriers and Lower San Joaquin
1416 9th St., Room 215-23
Sacramento, CA 95814
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