EVEREST June, 2013 - California Department of Boating and ...

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Orange County Coastal Regional Sediment Management Plan Sediment Trapped Behind Dams and Debris Basins Sediment excavated and placed nearby. Sediment Trapped Behind Dams and Debris Basins Sediment excavated and bypassed downstream. Urbanization of Watershed Degraded Wetlands Harbor Sand and Gravel Mining Sand and gravel sold for construction. Sand held in place by urbanization. Beach Erosion due to Less Sand Urbanization of Watershed Sand held in place by future urbanization is compensated through projects or fees. Restored Wetlands Harbor Sand and Gravel Mining Sand loss compensated through projects or fees. Sand from harbors placed on beaches in need. Mining moved out of river. More sand transported to coast. Less Beach Erosion Sand Trapped by Harbor Structures Dredged sand placed on nearby beaches. Less Sand to Coast Ocean Coastal Armoring Reduces Sediment Supply to Beaches Beach replenished with sand dredged from offshore. Sand Trapped by Harbor Structures More Sand Reaching Coast Ocean Reduced Coastal Armoring Increases Sediment Supply to Beaches Beach replenished with sand dredged from offshore or transported from inland projects. Figure ES.1 Schematics of Existing Sediment Management (left) and Coastal RSM (right) Everest International Consultants, Inc. vi
Orange County Coastal Regional Sediment Management Plan Many of these issues are exacerbated by climatic and sea level changes associated with global warming. Many of the problems caused by human modifications to the sedimentsheds can be solved and/or addressed through implementation of Regional Sediment Management (RSM) as represented in Figure ES.1 (Everest, 2007). These strategies include: • Sediment can be bypassed around upstream dams and blockages and be transported either immediately downstream of the dam or directly to the coast; • Sand and gravel mining activities can be moved away from river beds to prevent sand loss in river beds. For sand loss due to sand and gravel mining in the river, the loss can be compensated through restoration projects or mitigation fees; • Sand loss associated with future urbanization can also be compensated through projects or fees; • Sand dredged from harbor channels can be placed at locations that optimize the beneficial use of the material; • Beach erosion can be reduced by restoring natural sedimentshed processes, bypassing sand around harbors, replenishing beaches with sand dredged from offshore or transported to the beach from inland projects, and reducing coastal armoring. The Process The California Coastal Sediment Management Workgroup (CSMW), which is co-chaired by the US Army Corps of Engineers (USACE) and the California Natural Resources Agency worked in partnership with the County of Orange to develop this Plan. This Plan is one component of a larger statewide effort called the California Coastal Sediment Master Plan (USACE, 2005a; California CSMW, 2006; California CSMW, 2009; California CSMW, 2012). Key to development of the Plan was stakeholder input from local and regional agencies, non government organizations, elected officials, the scientific community, and various groups within the CSMW and the County of Orange. Data collection and Plan development were guided through multiple stakeholder meetings. In these meetings, known environmental, economic, physical, and regulatory data were described and new, previously unknown data, were provided to the project team by the stakeholders. Ideas for specific actions and activities that could be incorporated into the Plan were also suggested by stakeholders. Collected information was submitted to the database and pertinent summaries were prepared within Chapters 1 through 3 of the current report. This information was used to inform the stakeholder suggested activities in creation of the Plan. Everest International Consultants, Inc. vii
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EVEREST June, 2013 - California Department of Boating and ...

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