Coastal Zone Management

                    

Beach Sand Replenishment to Begin This Week at Cardiff State Beach

As part of the Build NCC project to restore the San Elijo Lagoon, crews will begin a beach sand replenishment project this week at Cardiff State Beach. Restoration crews recently completed the assembly of a dredge in the San Elijo Lagoon’s central basin and will begin delivering nearly 8,000 cubic-yards of high quality sand from the lagoon to North County beaches per day in an effort to reinforce and protect our shorelines.


The fully assembled Ross Island Dredge will begin to move high quality sands from the San Elijo Lagoon to Cardiff State Beach next week.

Beginning with Cardiff State Beach, approximately 300,000-cubic yards of sand will replenish the coastline. Sand will first be placed south of the lagoon’s inlet, its connection to the ocean. Sections will be filled as sand replenishment moves south along the coastal strand towards Seaside Beach.

The dredge will operate around the clock, Mondays through Saturdays for approximately 6 weeks. Nearby residents and visitors will likely hear noise and see nighttime lighting within the central basin of the lagoon. Beachgoers may smell a wetland scent emanating from the sand replenishment at the beginning of dredging, which is temporary and will assimilate into the marine environment. Water quality will be monitored throughout the operation. Additionally, small portions of the beach will be closed while crews are working in the area to ensure public safety during operations.

In later phases of the San Elijo Lagoon Restoration, crews will replace the removed sand in the lagoon’s central basin with high-nutrient sediments transferred from the various lagoon channels to improve tidal flow and overall water quality.

The San Elijo Lagoon Restoration is part of Build NCC, or the first phase of construction of the North Coast Corridor Program, and is funded through TransNet, the voter-approved half-cent sales tax.

 

About Build NCC

Build NCC is the first phase of construction in the cities of Solana Beach, Encinitas, and Carlsbad as part of the North Coast Corridor Program. Build NCC includes extending the existing carpool lane on I-5 in each direction from Lomas Santa Fe Drive to State Route 78, double tracking the rail line and replacing the highway bridge at the San Elijo Lagoon, replacing the rail bridges at the San Elijo and Batiquitos lagoons, restoring the San Elijo Lagoon, and constructing nearly 10 miles of new bike and pedestrian trails. Construction on Build NCC began in early 2017 and will be complete by 2021.

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For more information about the San Elijo Lagoon Restoration Project please go to the San Elijo Lagoon Conservancy Website HERE, email  [email protected] or call 760-436-3944 x713

 

The Coastal Zone Management program is designed to set up a basis for protecting, restoring, and establishing a responsibility in preserving and developing the coastal communities and resources. The vision of the Coastal Zone Program is to ensure that “the cities coast and oceans, are healthy and thriving for this and future generations.” The goal of the program is to have a healthy and productive ecosystem and to have environmentally, economically and socially vibrant and resilient coastal communities.

The National Oceanic and Atmospheric Administration (NOAA) has produced a document titled, “National Coastal Population Report, Population Trends from 1970 to 2020.” The document presents basic demographic status and trends information for Coastal Shoreline Counties and for Coastal Watershed Counties.

In addition, the City of Encinitas collects population data at eight beaches to determine trends, economic analysis and then provide agencies with quantitative data for beach usage.  Wide sandy beaches enhance the economic revenue for local businesses and increase tourism.  The summary 2016 Beach Attendance Report can be found here:  2016 Beach Attendance Report

What's happening on the beach in Cardiff?  
Beginning this fall, the San Elijo Joint Powers Authority will begin a project to replace the land outfall pipeline that originates at the San Elijo Water Reclamation Facility and connects to the ocean outfall at Cardiff State Beach. The 30-inch inside diameter pipeline conveys on average 10 million gallons per day (up to 25.5 million gallons per day) of treated wastewater from the cities of Encinitas, Solana Beach, and Escondido for ocean discharge approximately 1.5 miles from shore. The land outfall was constructed in 1965, and due to its age and the surrounding soil type, is estimated to be at the end of its useful life. Pipeline failure would likely have both environmental and financial impacts. To date, the SEJPA has not experienced wastewater spills associated with the outfall, and keeping the pipeline in good operating condition is of utmost importance to the agency. The replacement pipe material is high density polyethylene (HDPE) with an anticipated useful life of 100 years. The project is being constructed with the review and approval of seven local, state, and federal agencies.   

The process includes trenchless technology or horizontal directional drilling (HDD) to avoid impacting the lagoon. The HDD launch site will be located on the beach and the new pipe will connect to the existing ocean outfall pipe located approximately 15 feet below ground level at the beach.The HDD process involves drilling a pilot hole along the designated directional path from an entry point.The second stage involves enlarging the pilot hole to a diameter suitable for installation of the pipeline.The third stage consists of pulling pre-fabricated pipeline back into the enlarged hole from the directional drilling exit point to the entry point and ultimately to the point of connection. The dewatering activity on the beach will include baker tanks, separation plant and temporary storage trailers.

Two construction staging areas are required, one at the beach and one at the San Elijo Water Reclamation Facility.The staging site on the beach is approximately 250 ft. by 100 ft. rectangular area to accommodate the HDD launch site.The southbound lane on Coast Highway 101 will be reduced to one lane with a temporary bike lane and a reduction in parking.Construction will occur over a period of approximately 4 - 6 months.

For additional information: http://www.sejpa.org/wpro_projects/sejpa/userfiles/SE%20Outfall_Final_%20IS-MND-030116.pdf

 

Proposed Alignment for San Elijo Joint Powers Authority

 

 

Preparing for Sea Level Rise

Global sea level rise has been rising over the past century, and the rate has increased in recent decades.  In 2014, global sea level was 2.6 inches above the 1993 average – the highest annual average in the satellite records (1993-present).  Sea level continues to rise at a rate of about one-eighth of an inch per year. 

Higher sea levels mean that destructive storm surges push father inland than they once did, which also means more frequent nuisance flooding.  This is cause for concern along Coast Highway 101 and the Cardiff State Beach area. 

The two major causes of global sea level rise are thermal expansion caused by warming of the ocean (since water expands as it warms) and increased melting of land-based ice, such as glaciers and ice sheets.  The oceans are absorbing more than 90 percent of the increased atmospheric heat associated with emissions from human activity. 

Sea level rise at specific locations may be more or less than the global average due to local factors such as land subsidence from natural processes and withdrawal of groundwater and fossil fuels and changes in regional ocean currents.  Sea level for Southern California is measured using tide stations and satellite laser altimeters at Coastal Data Information Program (CDIP) managed by the Scripps Institution of Oceanography at CDIP Homepage.

Coastal Commission Sea Level Rise Guidance

The California Coastal Commission unanimously approved the Sea Level Rise Policy Guidance Document on August 12, 2015.  The document is designed to prepare for the impacts of sea level rise to ensure a resilient coast for present and future generations.  The document focuses on how to apply the Coastal Act due the challenges presented by sea level rise through Local Coastal Programs (LCP) certifications and updates and Coastal Development Permit (CDP) decisions.    Based on the guidance document the CCC started to require sea level rise analysis on the following Capital Improvement Projects: Beacon Beach Rehabilitation Project, Moonlight Beach Marine Safety Tower and the Coast Highway 101 Sewer Pump Station. 

FEMA Mapping

The Federal Emergency Management Agency (FEMA) is currently performing detailed coastal engineering analysis and mapping of the Pacific Coast of California.  Results will be used to re-map the coastal flood risk and wave hazards for California coastline.  Key coastal processes such as dune erosion, wave setup, wave run-up, overtopping, overland wave propagation and evaluation of coastal structures are accounted for in determining new Base Flood Elevations (BFE). 

The coastal flooding risk analyses include determining:  coastal stillwater elevations(SWEL), wave setup, wave run-up, overtopping extent, storm-induced erosion, overland wave propagation, and impacts to coastal structures.  Total wave levels will be determined for 50-,20-,10-,4-,2-,1-, and 0.2 percent annual chance flood events based on extreme value analysis of a 50-year wave and water level hindcast.  These analyses will be used to establish and/or revise the Special Flood Hazard Area (SFHA), Base Flood Elevation (BFE), and hazard zones for coastal floodplain mapping.  The new flood data and mapping will be used for updating and revising the Flood Insurance Study (FIS) and Flood Insurance Rate Maps (FIRMs).

Vulnerability Assessment and Adaptation Planning Grant (ICLEI)

The San Diego Foundation has funded ICLEI to evaluate sea level rise risks, vulnerabilities and adaptation strategies for the cities of Encinitas, Oceanside and San Diego.  ICLEI will provide a planning document on potential impacts due to flooding and possible inundation in 2100.  ICLEI will evaluate the infrastructures that will experience flooding during extreme events and develop adaptation planning tools for the City to consider.

Resilience refers to the ability to endure impacts associated with sea level rise and to respond, recover, and adapt to consequences.  An area, site, facility, or project that is highly resilient will be able to accommodate or tolerate more frequent flooding and adverse consequences associated with increasing sea level rise. Risk refers to the potential for, or exposure to, loss or undesirable impacts (or outcomes) and can be characterized as the combination of probability and consequence.  In other words, the lower the likelihood and effects, the lower the risk.  Facilities such as transportation facilities may have lower adaptive capacity and higher risk.  Ultimately, the scenario selected for a plan, project site, or design should reflect how much risk can be tolerated and the ability and effort necessary to implement modifications if adverse conditions are encountered in the future.

Adaptation Strategy Development Grant (NOAA)


The San Diego Climate Collaborative has also received a grant from NOAA (National Oceanic and Atmospheric Administration) to coordinate the coastal communities of Oceanside, Carlsbad, Encinitas, Del Mar and San Diego to provide new data on flood mapping, develop additional legal, economic and scientific expertise and help cities with outreach and communication.

Cardiff Beach Living Shoreline Project – Dune Restoration Project

 

Cardiff Beach Living Shoreline Project – Dune Restoration Project

July 2016 - The City of Encinitas, in partnership with the San Elijo Lagoon Conservancy, the California State Coastal Conservancy, and the California State Parks, proposes to create a dune system on the seaward side of Highway 101 on Cardiff State Beach to serve as a natural sea level rise (SLR) adaptation approach to protect a vulnerable segment of the roadway while providing native dune habitat. 

Coastal dune systems have been found to provide multiple benefits by providing coastal habitat and storm damage reduction during extreme events.  The Cardiff Beach Living Shoreline Project proposes to beneficially re-use export materials generated from the San Elijo Lagoon Restoration Project or other opportunistic sources of sand for the dune construction.  The project is scheduled to begin in winter 2017. 

The Proposed Project area spans 2,900 linear feet (about 0.5 mile) of shoreline, from the Chart House Restaurant to the north to just before the South Cardiff State Beach Parking Lot to the south. 

The State Coastal Conservancy and the Ocean Protection Council have provided the grants funds to provide an adaptation measure to reduce the potential impacts due to sea level rise while providing a multi-benefit of improving the native dune habitat.