IMAGE

Flood Ready Freddy holding a wet dog, named scout.

Flood Protection

At Work Maintaining Your Flood Protection System

17,220 feet of access road and drainage inspected and repaired

5,700 feet of concrete-lined channel cleared of vegetation and debris

210,720 feet of open channel mowed to reduce fire and public safety hazards

2017 Flood Recovery Continues

Zone 7 continues to repair flood protection sites damaged during the record-breaking 2017 storm season which brought significant rainfall and localized flooding throughout the Tri-Valley. Our flood protection system saw damage to channel banks, concrete structures, and maintenance roads, threatening utility lines and infrastructure. Our team made significant progress in the Fall of 2021 repairing six bank slide sites. Since February 2017, 104 of the 208 originally identified bank slide sites have been successfully repaired in Zone 7’s Rehabilitation of Flood Control Channels, Phases 1, 2 and 3 and by the U.S. Army Corps of Engineers. With the three (3) left to-be-repaired sites in Phase 3, this will bring the total repaired sites to 107. There are 101 sites that were removed from the field-documented 208 potential issues, as these were incorporated into Zone 7’s routine maintenance program. The remaining three sites were scheduled for completion in October 2022.

Goat in the Zone

After a successful pilot program, Zone 7 began conducting goat grazing activities at a limited number of sites to supplement our flood and fire preparedness efforts. The goats eat overgrown vegetation that gets dry in summer months and is at risk for fire and blocks the flow of water in flood channels during the rainy season. These helpful goats are a great addition to our preparedness efforts and a helpful addition to our Maintenance Program. The goats “work” along select access roads and channels to control the growth of herbaceous vegetation and invasive weeds, reduce fire fuel loads, and maintain grassland habitat for special-status species. In total, seven different sites were grazed this year, totaling approximately 117 acres.

Significant Achievements In
Flood Protection Program

Continued Routine Maintenance Program

As a part of the Routine Maintenance Program (RMP) for flood protection facilities, staff continued pursuing programmatic permits from California Department of Fish and Wildlife, Regional Water Quality Control Board, and the United States Army Corps of Engineers.

Bank repair planning

Staff prioritized district wide bank repairs according to level of risk presented by each site and continued to plan for an additional 4 repairs in 2022. Flood protection staff regularly monitor the sites pending repair for any changes in condition. Permits are already secured.

Arroyo Mocho Stanley Reach Bank Stabilization Project progress

The Arroyo Mocho Stanley Reach Bank Stabilization Project was authorized for construction in April 2021 and began in May 2021. At the end of June, approximately 50% of the channel restoration had been completed.  

Channel improvements were 100% completed by October 2021, with all road improvements addressed by May 2022. Work was completed ahead of the original December 2022 schedule. 

US Geological Survey 3D Elevation Program Grant for LiDar Acquisition

In the Fall of 2020, Zone 7 applied to the US Geological Survey (USGS) 3D Elevation Program for a grant to acquire high-definition elevation data and gather important topography information of our flood channels. Zone 7 was awarded the grant in early 2021 and worked in collaboration with the USGS to share data, LiDAR acquisition and processing costs. During the summer of 2021, LiDAR data was acquired over the region by the USGS’s vendor. Data was reviewed by the USGS and finalized in June 2022. The data covers all of eastern Alameda County with the highest quality (QL0) covering the urban areas of Dublin, Livermore, and Pleasanton.

The Bank Stabilization, Arroyo Del Valle Project

The team continued work on the bank stabilization of Arroyo Del Valle and restored 220 linear feet of levee and added 150 ft of geogrid support.

6 horizontal drains installed

1 headwall repaired

5 biotechnical repairs

Maintenance Updates

Debris clean-up

Our maintenance staff coordinated with the City of Livermore and Caltrans for several creek cleanups along the Arroyo Las Positas in Livermore within portions of the channel that have become homeless encampments. We collaborated with local service providers including Block by Block, CityServe, Monthly Miracles, and Open Heart Kitchen to provide services to the unsheltered individuals living within the Creek. Approximately 46 tons of waste and debris was removed from the creek and disposed of in a safe and respectful manner.

Outfall and drain pipe assessment

Staff began an asset inventory and condition assessment of all outfall structures and drainpipes within Zone 7 owned channels using ESRI Survey123 application. The location and condition of each outfall pipe and structure was documented and given an overall condition assessment. To date, 582 outfall structures have been documented within Livermore, Pleasanton, and Dublin. Staff are now collaborating with the cities to coordinate maintenance activities.

In-channel structure maintenance

The team performed routine maintenance including minor concrete repair, crack sealing, and outfall repair on in-channel structures along Pleasanton Canal, Old South San Ramon Creek, Tassajara Creek, and Alamo Canal.

Vegetation management

Routine vegetation management work included trimming, pruning, and removal of vegetation and woody debris along access roads, fence lines and in-channel throughout the service area.

Zone In On
What You Can Do

The erratic weather caused by climate change makes planning ahead even more important. California is experiencing its third year of an unprecedented drought. The drought conditions make the atmospheric rivers that are now more commonplace even more dangerous. Because the drought has left the soil parched, when big storms arrive, it is often too much for the soil to absorb and the water has nowhere to go.

Make sure you and your loved ones are prepared. Our flood-preparedness expert Flood Ready Freddy has all the tips you’ll need at zone7water.com/floodready to ensure that you don’t get caught off guard by a flood emergency.

Water Reliability

Drought and conservation