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San Dieguito LagoonInlet Dynamics and Maintenance
Coastal EnvironmentsLa Jolla, CA
www.coastalenvironments.com
3 June 2004CE Ref. No. 04-07
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Lagoon Inlet DynamicsLagoon monitoring program1993 FloodInlet sedimentationInlet behavior
Inlet Maintenance PlanInitial and Periodic MaintenanceExcavation, public access and safetyEffect of artificial inlet opening on adjacent beaches
Video – Excavation Operation (Sep 2000)
Lagoon Inlet
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Surveys and Measurements
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1993 San Dieguito River Discharge
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Established Transects
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Transects of Interest
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Traverse TR2 Located at the Inlet Area
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Traverse TR7 Located at West Channel
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Traverse TR10 Located East Railway Bridge
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Traverse TR11 Located East Railway Bridge
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Cross-Sections Changes
Jan Jan Sep1993 1994
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Areas 1, 2 and 3
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Sedimentation Rates Areas 1, 2 and 3
6000
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Weak Outflow – Inlet 1992
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Flood of 1993 causing Strong Flow – Inlet 1993
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Stable Inlet – 1994
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Excavation Plan
Initial excavationAt start of project
Estimated by 45,000 yd3
Periodic excavation Every 8 months
16,000 yd3
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Initial Excavation
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Periodic Excavation
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Estimated Excavated Volumes
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Opening San Dieguito Lagoon
Still open5 Sep 20033
4 Nov 20024 Oct 20022
21 Nov 200123 Sep 20001
Close DateOpen DateNumber
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Beach Response to SEP 2003 Artificial
Inlet Opening
Profile Located Just South of Inlet Control Profile Located 2,000 ft South of Inlet
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Excavation Operation – Sep 2000