Every summer since 2001, the Santa Clara Valley Water District has undertaken a five-month-long effort to maintain and improve stream conditions so they can safely carry water during winter storms. From June to October, our crews trek into streams to remove sediment, manage vegetation, clear trash and debris, and stabilize banks that have been eroded.
During heavy storms, unruly vegetation and sediment washed down from areas upstream can restrict the flow of water and in some areas, cause a back-up, increasing the risk of flooding. Managing vegetation is an important part of stream maintenance. Removing invasive vegetation, weeds and dry brush improves habitat for wildlife and a healthy stream ecosystem, contributes to improved flows in creeks, and even reduces the risk of fire hazards along neighboring properties.
While the heavy work takes place in the summer, stream maintenance is a year-round effort. Each year district crews inspect stream and bank conditions, especially after storms. Toward the end of the rain season, staff identify maintenance projects for the upcoming work season.
The water district’s Stream Maintenance Program ensures flood protection projects continue to function as designed to protect homes and businesses along water district streams. These projects remove homes and businesses from FEMA designated flood zones, and in addition to flood risk reduction activities, save residents countywide over $2 million in flood insurance premiums each year. The water district owns 278 miles of streams in our county, but only a portion of them have been improved with flood protection projects. Those are the streams that get maintenance projects.
Throughout the county, the water district works with partner agencies and private property owners to monitor creeks and perform maintenance where the water district either owns the land or has easements. Additionally, maintenance work is very limited on a natural channel, or a creek without a completed flood protection project. Without a completed project in place, work performed on a natural channel threatens both wildlife and properties, harming natural habitat by removing native vegetation and destroying habitat if enlarging the channel to increase the flood capacity. It could also redirect floods to another location downstream. Limited maintenance like removing trash and debris is allowable, if approved by regulators. Each year the water district works on obtaining the necessary permits from regulatory agencies to proceed with labor on identified priority locations. The permits require the work be completed between the months of June through October.
This work season, the water district has identified over 400 projects along water district facilities among 63 different streams, consisting of 16 sediment removal projects, 17 stream bank repairs, and hundreds of vegetation management projects, including an invasive plant removal on Coyote Creek. We are also working with our regional partners, like the City of San Jose, to identify projects in which they can perform maintenance on their portions of streams that they own. If you own property along a creek and have questions or concerns regarding stream maintenance, you can contact our Community Projects Review Unit at 408-630-2650.
The water district acknowledges the community’s role in helping us keep homes and businesses safe. We are grateful for the residents and business owners who have reported potential blockages in our waterways. We continue to encourage reporting of concerns or issues in creeks that can affect the flow of stormwater.
If you notice something blocking a stream during a storm, call our flood hotline at (408) 630-2378. You can also report any problems with creeks in our service area to our “Access Valley Water” online customer request and information system. We will assist you or direct you to the appropriate agency having jurisdiction.