Transcript W6A-Jack Answorth - CAL

Slide 1
Malibu Lagoon
Copyright © 2002-2003 Kenneth Adelman, California Coastal Records Project.
Slide 2
Malibu
Lagoon
Malibu Creek Watershed
Slide 3
Malibu Lagoon and surrounding wetland ecosystem in 1938
Photo Courtesy of Air Photo Archives, UCLA Geography Department
Slide 4
Old Parking Lot
A Channel
B Channel
C Channel
Prepared by: Moffatt & Nichol
April 2005
Existing Channel Configuration
Environmental problems associated
with current lagoon configuration
Slide 5
•Loss of ecosystem function due to poor circulation,
sedimentation, low dissolved oxygen, and eutrophication,
•Loss of salt-marsh and lagoon habitat due to historic fill,
urbanization of the surrounding areas, and inappropriate
landscaping,
•Proliferation of non-native and invasive plants and animals;
elevated freshwater and nutrients have facilitated invasion of
exotics
•Impoverished native benthic invertebrate communities likely
due to altered hydrology, and,
•Reduced native fish populations.
Slide 6
Existing Channel Configuration
Slide 7
Existing Vegetation
• 133 species of vascular plants in Malibu Lagoon
• 5.3% native estuarine species
• 29.7% native non-estuarine species
• 65% non-native and invasive species
Data from Manion & Dillingham 1989
Photo from project files
Infaunal Invertebrates
Spionid Polychate, Polydora nuchalis
Slide 8
Tellinid Clam, Tagelus californianus
Epifaunal Invertebrates
Mud Crab, Hemigrapsus oregonenesis
Photos from Google Images
Introduced Oriental Shrimp,
Palaemon macrodactulus
Slide 9
Tidewater Goby
Topsmelt
California Killifish
Non-native Mosquito fish
Slide 10
Photos Courtesy of Callie Bowdish and Google Images
California Coastal Act Sections
Slide 11
Section 30231 Biological productivity; water quality
The biological productivity and the quality of coastal waters, streams, wetlands,
estuaries, and lakes appropriate to maintain optimum populations of marine
organisms and for the protection of human health shall be maintained and, where
feasible, restored through, among other means, minimizing adverse effects of waste
water discharges and entrainment, controlling runoff, preventing depletion of ground
water supplies and substantial interference with surface waterflow, encouraging
waste water reclamation, maintaining natural vegetation buffer areas that protect
riparian habitats, and minimizing alteration of natural streams.
Section 30233 Diking, filling or dredging; continued movement of sediment
and nutrients
(a)The diking, filling, or dredging of open coastal waters, wetlands, estuaries, and
lakes shall be permitted in accordance with other applicable provisions of this
division, where there is no feasible less environmentally damaging alternative, and
where feasible mitigation measures have been provided to minimize adverse
environmental effects, and shall be limited to the following:
6) Restoration purposes.
Section 30240 Environmentally Sensitive Habitat Areas
a) Environmentally sensitive habitat areas shall be protected against any significant
disruption of habitat values, and only uses dependent on those resources shall be
allowed within those areas.
Slide 12
Goals of Proposed Restoration
• Increase tidal circulation and flushing to improve water quality
under open and closed lagoon conditions.
• Restore a diverse mosaic of coastal salt-marsh and transitional
upland habitats.
• Increase and enhance aquatic habitat for benthic invertebrates and
native fish including the federally endangered tidewater goby
(increase sediment grain size) and the federally threatened
steelhead (higher water quality within the lagoon).
• Increase native foraging, nesting, and roosting habitat for resident
and migratory shore birds and waterfowl.
• Provide education/interpretive opportunities while minimizing
disturbance to habitat and wildlife.
Slide 13
Prepared by: Moffatt & Nichol
April 2005
Slide 14
East Side
Inlet
Golf
Course
Slide 15
Malibu Lagoon
Copyright © 2002-2003 Kenneth Adelman, California Coastal Records Project.
Item W6a-Malibu Lagoon
Public
Accessway to
be Improved
Existing Walkway
through lagoon w/
bridges to be
removed
Slide 16
Slide 17
Item W6a Malibu Lagoon
New Public Parking Lot (Phase I)
Entrance to Public
Accessway to be
Improved
Walkway to be
removed
Slide 18
Item W6a Malibu Lagoon
Slide 19
Item W6a Malibu Lagoon Restoration
California Coastal Records