Friday, April 28, 2017

Coastal Trail Award



Recognition for the Surfers' Point Managed Retreat Project at last week's California State Parks annual Trails and Greenways Conference.




Thursday, April 27, 2017

Matilija Dam Funding Plan


In March 2016, the Matilija Dam Design Oversight Group (DOG) reached consensus on an approach to dam removal that provides a cost-effective solution to sediment management.  Following this consensus, the Matilija Funding Subcommittee was formed with volunteers representing various stakeholder groups.  The Subcommittee has focused on developing a Funding Plan, while simultaneously pursuing funding opportunities for the Project.

This year, the VCWPD, with support from the Matilija Funding Subcommittee, has secured a $3.3 million California Department of Fish and Wildlife Proposition 1 Grant. This funding will advance the Project to the 65% design phase and complete the environmental and permitting requirements over the next 3 years.

The Funding Plan was developed to provide an overview of possible funding sources for the remaining design, permitting, and construction of the Project.  Cost estimates were developed based on an analysis of the project timeline and costs of the various project components.  The document may be downloaded here: Matilija Dam Removal and Ecosystem Restoration Funding Plan April 2017






The shorter timeline assumes sufficient funding is available to construct all downstream project components simultaneously, during 2021-2022, with dam removal complete by the end of 2024. This “best case scenario” also assumes no waiting period for dam removal following construction of orifices in the face of the dam (i.e., the required high storm event would occur immediately following the construction of the orifices). The longer timeline assumes the same planning schedule, but with sequential, not concurrent, construction of downstream infrastructure and includes a three-year waiting period for dam removal. In this case the dam is not removed until 2031, a 15-year project.




Total cost estimates shown were developed for "2017 dollars" as well as an escalated figure that includes inflation, and projected construction and management cost increases.  The proposed “Uncontrolled Orifices with Optional Gates” alternative project ($111M in 2017 dollars) is a more economically feasible and expeditious project than the congressionally authorized Army Corps of Engineers (ACOE) Alternative 4b project ($205.8M in 2017 dollars) that was previously contemplated for the Project.

These preliminary estimates also indicate that the overall cost of removing Matilija Dam will increase over time, and that a longer timeline will be subject to both inflation and increased program management costs. Therefore, there is an advantage to completing the project on a shorter timeline, although this would of course be dependent on the availability of funds.  Strong support from state agencies, (and unlikely federal appropriations to the original ACOE Project plan), provides a path forward for the less expensive local plan in a timely manner.


The report outlines a diverse array of current and potential state, federal, local, and private funding opportunities are potentially available to fully implement the project.  Moving quickly to access the immediately available funding options presented in this plan (particularly CDFW and Coastal Conservancy Prop 1 funding), leads to substantial cost savings over time. But, it’s also important to note that this approach brings the Project to a level of readiness for possible benefit from one of the evolving legislative opportunities. This includes a state water bond or local tax measure pass with provisions favorable to implementation of Project components. However, the County may only be able to apply for and access funding if preliminary design work and downstream components are complete. Having a “shovel ready” project is critical to take advantage of existing state funding and evolving legislative opportunities. If successful, this strategy will not only lead to dam removal sooner, but significantly reduce the overall cost of the Project.


Reference:

Matilija Dam Removal and Ecosystem Restoration Funding Plan April 2017



Thursday, April 20, 2017

Matilija Coalition receives award

Matilija Coalition Earth Day Award
L to R: Matt Stoecker, Diane Underhill, Kathy Bremer, Paul Jenkin, Supervisor Steve Bennett,
Hans Cole, and Candice Meneghin
 April 18, 2017: the Ventura County Board of Supervisors recognized the Matilija Coalition for "Excellence in Environmental Stewardship" as part of their Earth Day awards.




The Matilija Coalition is an alliance of community groups, businesses, and individuals committed to the environmental restoration of the Ventura River watershed. Since 2000, the Matilija Coalition has worked to achieve the following vision: a free-flowing Ventura River from the mountains to the sea; a thriving population of steelhead trout in its waters; a healthy, native ecosystem; a wide, sandy beach along the coast; and opportunities for public enjoyment, education, and recreation for current and future generations.

The Matilija Coalition and its members have played an integral role in the multiagency Matilija Dam Ecosystem Restoration Project, and the Matilija Coalition steadfastly advocates for an ecologically sensitive, cost effective, and timely removal of Matilija Dam. The Coalition has maintained an active role in the various technical working groups and, through many years of this work, helped achieve the 2016 consensus decision reached by stakeholder agencies around a preferred dam removal alternative. Since spring 2016, members of the Coalition have helped lead the effort to identify sources of funding for the Matilija project, and have been instrumental in seeing state and private funders commit to supporting the next phase of the project through California Department of Fish and Wildlife’s Prop 1 Watershed Restoration Grants program and the new “Open Rivers Fund”, a project of the Hewlett Foundation and Resources Legacy Fund. 

On a watershed level, the Coalition has helped lead and maintain the Friends of the Ventura River group, which was responsible for development of a Ventura River Parkway vision and trail guide. The trail guide has become a popular resource locally, and is available in both English and Spanish. In 2014 Ventura River Parkway Trail was dedicated as a National Recreation Trail.   The Friends of the Ventura River website includes an archive of relevant technical and historical documents.  



Tuesday, April 11, 2017

Surfers Point stewardship days


Surfrider and the City of Ventura continue to sponsor volunteer work days at Surfers Point.  Spring weeding is an ongoing part of the ongoing dune restoration process.  The two events this year focused once again on the non-native plants "Sea Rocket" and "Ice Plant."

Over 20 volunteers came out for the morning on February 11, with over 50 on April 9.  The timing was perfect, with the opportunity to remove fresh sprouts in February and the remainder before seeds matured in April, so that next year we should see reduced re-sprouting.



Volunteers weeding Sea Rocket (foreground)
BEFORE - non-native Sea Rocket in foredunes (Photo Dave Hubbard)
AFTER - only native plants remain, with room to spread (Photo Dave Hubbard)
 

Careful removal of Sea Rocket amongst native flowering plants

These Cal Lutheran students removed a large growth of Ice Plant near the Ventura River levee 



Thursday, March 16, 2017

Ventura river mouth after the 2017 flood

Ventura river mouth 3-10-2017
 These aerial photos illustrate the beach renourishment potential of the Ventura River.  Last month's storm produced peak flows of around 20,000 cubic feet per second, which is enough to scour the river's floodplain of vegetation and transport tons of sand and cobble to the beaches.  In the image above, the circle to the left of the river mouth is the historic WWII gun turret which has been situated right at the edge of the beach.  The new river deposits extend almost 30 yards further out to sea.


sediment deposits from flows of 2017
 In this image, taken high above the secondary mouth of the river, the cobble and sand deposits are evident.  All of these photos are taken at almost a -1 ft low tide.  Every tide cycle, wave action  reworks these deposits and moves the sediment down the coast (away from the viewer).  This is evident in the way the sand spit is closing off this mouth of the river.

Surfers' Point Managed Shoreline Retreat
project area showing recent sediment influx from the river
This photo shows the restoration project area.  The high tide line is visible, and highlighted by sticks and logs that also came from the river.  Sand has moved into the area fronting the beach, and has also already moved down the beach.  All of this new sand will move onshore over the summer, and the beaches will be wider than last year, because the extended drought was starving the beaches.

(Studies have estimated that the removal of Matilija Dam will increase sediment delivery to the coast by 30%.)

Many thanks to Rick Wilborne for his aerial photography that illustrates these changes in the beach so well.

Surfers' Point managed retreat project 3-7-2017
Recent floods deposited sand and cobble that is visible here at low tide



Deposits at the Ventura river mouth following 2017 flood 



More on this blog:

Matilija Dam, after the storm...http://www.venturariver.org/2017/02/matilija-dam-after-storm.html











Tuesday, February 21, 2017

Surf science



The LA Times reports that last winter's  El Niño triggered unprecedented erosion across California's coast.

The article highlights research analyzing last year's El Nino storm track that brought us one of the best winter surf seasons on record. 





This new research confirms what we observed in Ventura: the combination of large waves and drought drove unprecedented levels of winter shoreline retreat.


the "cove" at Surfers Point in Ventura
post El Nino winter beach, 5-6-2016


the "cove" at Surfers Point in Ventura
summer beach, 6-28-2016


The drought is just one factor in sand-starved beaches.  “...we dam the rivers for flood control and say, ‘Holy crap, the sand’s not getting to the beaches anymore.”

But last year another force was in play; rising sea levels.  The paper states that "Water levels anomalies of 7–17 cm above normal were measured across the US West Coast during the El Niño winter of 2015–2016, similar to anticipated global mean sea-level increases expected within the next few decades."

This El Niño may have been a big one, but it may become “the new normal”

Which raises the question;

How will rising sea levels affect surfing in the future?

This topic is explored in a new paper titled Using local knowledge to project sea level rise impacts on wave resources in California published in the journal Ocean & Coastal Management.

This research concludes:
Map of California surf-spot vulnerability, Reineman et al

  1. Sea level rise will likely impact the quality of surf-spots; in California that impact will be a net reduction in overall wave quality at current surf-spots. 
  2. Vulnerability of surf-spots to sea level rise varies geographically, with some surf-spots and some regions experiencing more significant reductions in wave quality; due to sea level rise, roughly 18% of surf-spots evaluated here are Threatened by drowning and 16% are Endangered; 5% could improve. 
  3. Surfers' local ecological knowledge of waves constitutes a measureable source of data about environmental condition and variation. 


As sea level rises locally, surf-spots that break at low tide, or medium tide, or high-tide will be increasingly and sequentially inundated: the water will simply be too deep for them to experience their best conditions.

And perhaps most relevant to our local situation, in areas where landward migration of the beach is not permitted, either through seawalls or natural marine terraces, the beach will be "drowned."

Factors influencing surf-spot vulnerability, Reineman et al


This research relied upon surveys of thousands of surfers, who often have the best understanding of local conditions.  The paper concludes that;

Given the vast economic and cultural importance of surfing, these conclusions suggest that coastal managers should not only give credence to the wave knowledge of surfers, but also take wave quality and vulnerability into consideration, especially when planning coastal armoring, beach nourishment, or other developments, whose impacts to natural coastal processes could affect waves.


On this blog:

Surfer Magazine cover
C-St Ventura - cobble and erosion Dec 2015
Surfers Point - first real test
Surfers' Point emergency revetment


References:

El Niño triggered unprecedented erosion across California's coast, LA Times Feb 14, 2017

Extreme oceanographic forcing and coastal response due to the 2015–2016 El Niño.  Barnard, P. L. et al. Nat. Commun. 8, 14365 doi: 10.1038/ncomms14365 (2017).
http://www.nature.com/articles/ncomms14365


Using local knowledge to project sea level rise impacts on wave resources in California, Dan R. Reineman, Leif N. Thomas, Margaret R. Caldwell, Ocean & Coastal Management. Volume 138, 15 March 2017, Pages 181–191


Monday, February 20, 2017

Matilija Dam, after the storm...

Matilija Dam, Feb 18, 2017
flow  3,500+ cfs

2-day rainfall totals Feb 18, 2017
http://www.vcwatershed.net/fws/gmap.html


The storm of Friday, February 17, 2017 delivered 9-10" of rain to the Matilija Canyon watershed.  Flows in Matilja Creek peaked at 4pm with approximately 7500 cfs (cubic feet per second) flowing over the dam.  The Ventura River at Foster Park peaked over 20,000 cfs later that evening.   


The hydrograph below shows flows in Matilija Canyon exceeded 3000 cfs for more than 48 hours.  This is the perfect scenario for flushing the fine sediments from the reservoir to the ocean, as required in order to physically remove the dam.  (See Matilija Dam stakeholders select local project)

Hydrograph for February 2017 storm showing flows at
Matilija Canyon and Ventura River at Foster Park
USGS Current Conditions for USGS 11118500 VENTURA R NR ...
Studies completed last year determined that the minimum high flow event on Matilija Creek that is assumed to be able to transport the large quantities of fine sediment over a short period of time is a storm having an average daily flow of at least 1,700 cfs, corresponding to a peak daily flow of about 3,000 cfs (Stillwater Sciences, 2014b). This is approximately a 4‐year recurrence interval on Matilija Creek.

Although much work remains until the project is ready, a storm like this will exceed that required for the eventual removal of Matilija Dam.



In the News:


“What it really demonstrates is the tremendous energy that the Ventura River has when we get these types of flood events,”


On this blog:


References:


Matilija reservoir upstream of the dam, Feb 18, 2017
The main flow currently enters the reservoir along the right bank (far side in this photo)




contrasting graffiti decorates the obsolete Matilija Dam