Thursday, February 17, 2011

Hemlock Dam Removal

Around the country, more dams are being removed today than are being built. One example of a successful project is Hemlock Dam Removal on the Columbia River system.

This video showed in this year's Wild & Scenic Film Festival, and documents this project:

Of note in this video:
  • Sediment management included excavation of a new channel upstream of the dam and trucking material off-site
  • Site restoration utilized on-site trees removed from the project area as well as additional imported logs
  • Community restoration involving local schools for re-vegetation of the project area
  • Steelhead returned immediately once flows were re-introduced into the restored channel

More information:

Hemlock Dam Removal and Trout Creek Restoration Project
Sediment Impact Analysis for the Proposed Hemlock Dam Removal Project

Wednesday, February 16, 2011

Surfers Point - More Cobble and Sand

Progress at Surfers' Point: Thousands of tons of cobble have been imported, completing the cobble berm on the east end of the project area. The berm was saturated with sand, then contoured as seen here.

Sand was imported, quickly burying the cobble and widening the beach 60 feet inland.

The view from the east end:

On the west end, the fill under the parking lot was excavated and trucked away for disposal.

Then more cobble was brought in to begin extending the berm to the river levee at the western end of the project area.

This week, project managers got approval from City Council to spend an additional $180,000 on more cobble to fill this area.

In the news: Ventura needs more cobble for beach restoration

More info:

Tuesday, February 15, 2011

Next steps - Notching?

'Just Notch It'

No matter who you speak with about Matilija Dam, the question always comes up; "Why not just take the dam down a bit at a time and let the river gradually remove the sediment?"

Indeed, one of the newspaper editorials this summer suggested "that the dam be notched down to the top of the silt in 2011 so that all future rain waters and silt in the drainage shed will flow to the ocean, like before the dam was constructed."

And Patagonia's Yvon Chouinard weighed in with, "Notching it down bit by bit, year after year... That's what I think is the solution."

Even a 3rd-grader suggested notching during a class presentation almost a decade ago. So it would seem like a logical approach.

In the world of sediment management alternatives for dam removal, notching is categorized under 'Natural Transport' - or in more simple terms, let the river do the work.

In the last decade much progress has been made with analysis and demonstrations of natural transport. This information is summarized in a document produced for the Matilija Workgroup by Matt Stoecker. And this summer, in the biggest project of its kind, the removal of two dams on the Elwah River in Washington State will begin, one notch at a time.

So why not?

The "Matilija Dam Fine Sediment Workgroup" has completed two meetings so far. Although much of this time has been spent on process (goals, who is at the table, voting structure, etc.) there has been some discussion on where we are, how we got there, and what that means for future options. The Army Corps of Engineers presentations on this topic may be downloaded at

Currently there is a plan for the removal of Matilija Dam, its components described in the poster we printed last year. This plan is the result of a multi-year feasibility process that began in 2000, achieved consensus and local signoff in 2004, and made it all the way up through the ranks to ultimately gain congressional authorization in WRDA 2007.

Changes to the federal plan will require re-approval, the level of which will depend on how drastic any changes may be. A minor change may only require local approval, while more significant changes would trigger additional environmental review, and perhaps congressional re-authorization.

The Corps state that their design goals have been to:
  • Hold Project Cost
  • Conform to Environmental Documents
  • Constructability
  • Expedite Schedule
An explanation of the Corps thinking behind fine sediment management is shown in the diagram below. Cost overruns were stated as the primary reason the Corps did not implement the 2004 consensus plan for the temporary disposal of fine sediments at (BRDA - Baldwin Road Disposal Areas.) Permanent disposal at MODA - Meiners Oaks Disposal Area was seen as preferable, but encountered community opposition. The more recent USA - Upstream Sediment Areas was an even greater departure from the approved plan, and drew even heavier public scrutiny.

Now, taking a broader look at potential alternatives, the Corps estimates that the additional studies and review for Natural Transport would take another decade and cost up to $7M.

The other major consideration with natural transport is the reason the project got so complex in the first place: Robles Diversion Dam. The feasibility plan called for dredge-and-slurry of the fine sediments that are concentrated immediately upstream of Matilija Dam, so as to bypass Robles Diversion and eliminate any threat to the water supply in Lake Casitas. This concern still exists, along with the concerns of the other water agencies at the table.

What Next?

The immediate next step is for the Matilija Dam Fine Sediment Workgroup to work through the facilitated process and come to a common understanding of potential solutions. This would hopefully lead to a consensus on next steps, including the technical studies needed to determine the feasibility of any modifications to the approved plan. (It may be that the group simply agrees to pursue final design of the approved BRDA plan.)

But if we are truly committed to removing Matilija Dam, funding a $150M+ project is an even bigger hurdle. The project is still lacking the commitment for almost $100M in federal funding. The majority of the non-federal matching funds is expected to come from the State, but this, too, may be a long time coming in the current era of budget cuts.

Moving Forward

There may be ways to greatly reduce the overall price tag of the project if some degree of natural transport is used. At the very least, the dam should be notched down to the current silt level to avoid any further accumulation of sediment. Studies predict that the dam will trap an additional 3 million cubic yards of sediment, or half again as much as currently sits in Matilija Canyon; thus every major rain event increases the eventual cost of dam removal.

The Feasibility Study did also analyze a 2-phase notching scenario, so there may be ways to tag onto this analysis without triggering complete re-authorization.

The Matilija Coalition has consistently advocated that cost effectiveness and ecosystem restoration go hand-in-hand. Last year we published an array of alternatives titled "Sediment Management and Restoration Opportunities for the Matilija Dam Ecosystem Restoration Project" This document suggests ways that sediment management may be optimized within the context of the feasibility plan to avoid impacts and maximize cost effectiveness.

Note that the Corps' objective has always been 'disposal' of sediments - with an strong preference to permanent landfills. However, another way of looking at this is to recognize the role of sediment in the ecosystem, and devise a means to make use of this resource and reintroduce it in a controlled manner.

There is no question that letting the river do the work will cut costs. Whether these concepts can advance remains to be seen.

The next meeting of the Matilija Dam Fine Sediment Workgroup is scheduled for Thursday Feb 24, 2011.

More information:

Eucalyptus trees removed

According to the Ventura County Star,

Hundreds of mature eucalyptus trees on private farmland near the Ventura River were felled Saturday because they were casting too much shade on adj
acent farmland... Not every tree will be lost. Some on a city controlled easement closer to Main Street, including several with limbs overhanging the two-lane road, will be left in place. The property was recently acquired by the Santa Barbara-based nonprofit Wood-Claeyssens Foundation, which plans to lease the adjacent land to a farmer to grow strawberries.

Change is happening fast at Taylor Ranch, with expansion of orchards and strawberries. Apart from potential impacts to water supply, agricultural runoff has created impacts to water quality in the river and on the beach:

More on the Woods Clayson Foundation purchase of the property:

Tuesday, February 8, 2011

Beyond Sea Rise - VCReporter

Following the lead of the LA Times, the VC Reporter (Feb 3, 2011) published an article discussing the bigger picture aspects of the Surfers Point Managed Shoreline Retreat Project.

While the LA Times focused on Managed Retreat as a response to climate change, the Reporter took the opportunity to make the connections with the Matilija Dam Ecosystem Restoration Project.

“You heal the beach by healing the watershed, by restoring natural sediment supply,” said Paul Jenkin, Surfrider Foundation Ventura Chapter environmental director. Going forward, Jenkin said “removing the dam is complimentary in this retreat.”

I also did an interview last week with KCET television who are working on a half hour show on sea level rise and coastal management... air date TBA

All good stuff. These things are all connected. But now I wonder if we have been too successful in 'marketing' this project's place in the restoration of our ecosystem...

What may be getting lost in this discussion are the very real, tangible benefits that will be come from the restoration of the beach at Surfers Point. By implementing this approach as an alternative to a hard seawall, the community will gain:
  • a major face-lift to a seriously degraded public area
  • permanent protection and maintenance of a usable public beach
  • permanent protection of the surf quality at 'Stables'
  • improvements in water quality through reduced and treated Fairgrounds runoff
  • a more natural environment compatible with the mouth of the Ventura River
  • economic benefits from visitors to a unique restored coastal area
Part of the challenge is that we may not realize the full benefit of the project without the funding to complete it - future funding will be needed to construct the dunes, permeable parking lot, bathrooms and showers, as well as to restore the remainder of the beach in 'Phase 2.'

And while the removal of Matilija Dam is not 'necessary' for the Surfers' Point project to function well, it sure would be nice to get more of that sand and cobble on the beach!

Stay tuned...