Parent Layer: ESA Sea Level Rise Inundation

Name: ESA 3 ft (93 cm) of sea level rise

Display Field: Connection

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: These hazard zones depict flooding caused by a coastal storm. The processes considered include (1) storm surge (a rise in the ocean water level caused by waves and pressure changes during a storm), (2) wave run-up (waves running up the beach and over coastal property, calculated using the maximum historical wave conditions), (3) extreme lagoon water levels which can occur when lagoon mouths are closed and fill up during rainfall events, (4) additional flooding caused by rising sea level in the future, and (5) areas expected to erode be the given time horizon (see longterm erosion hazard layers). These hazard zones do NOT consider upland fluvial (river) flooding and local rain/run-off drainage, which likely play a large part in coastal flooding, especially around coastal confluences where the creeks meet the ocean. There are two types of inundation areas: (1) areas that are clearly connected over the existing digital elevation through low topography, (2) and other low-lying areas that don’t have an apparent connection, as indicated by the digital elevation model, but are low-lying and flood prone from groundwater levels and any connections (culverts, underpasses) that are not captured by the digital elevation model. This difference is captured in the “Connection” attribute (either “connected” or “connectivity uncertain”) in each dataset. We recommend these be mapped as separate colors. -------------------------------This feature is one in a series of coastal flood and erosion hazard zones developed as part of the Los Angeles County Coastal Hazard Modeling and Vulnerability Assessment. For detailed documentation about how these hazard zones were developed, please see "Los Angeles County Coastal Hazard Modeling and Vulnerability Assessment: Technical Methods Report," a report prepared by ESA for The County of Los Angeles in September 2016.-------------------------------The name of this shapefile reflects the future scenarios and planning horizon that the hazard zone represents, as follows:"coastal_floodhz" + _ + sea level rise scenario + planning horizon-------------------------------Sea level rise scenarios:ec – Existing conditions (2010 water level)s2 – Medium sea level rise (93 cm by 2100)s3 – High sea level rise (167 cm by 2100)s4 - Extreme sea level rise (167 cm by 2080)-------------------------------Planning horizons:2010 (Existing conditions)203020502080 (Only for Extreme SLR)2100

Service Item Id: 9167ee882ae94a6e9d1a4e7f82be3d44

Copyright Text: Environmental Science Associates (ESA), 2016

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