FLOOD02251

• County: Statewide
• Basin: Statewide
• Title: Southland Fires Aftermath Emergency Erosion Protection
• Date: 1/17/1994
• Prepared By: California Builder & Engineer
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

Table 2. Assessment af bum area hazards
Hazard Impacts
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Fire/site i;i ~ u. a: a: 0. 0 ,::
Laguna "'Beach - . -. .. - --- -- -
.Park Avenue drainage L H H M N H H M H L H
-Mystic-Skyline Drive M H H H M H H M L L H
-Canyon Acres H H H H M H H H H L H
.Big Bend M H H M ? H H M H M H
-Arroyo Drive L H H H M H H M M L H
.Irvine Bowl M H H L M M H M L L M
.Irvlne Cove L M L L L L M L L L L
-Emerald Bay L M H L M M H L M L M
-Er Mora CommunIty L H H L N M M L L L L.M
-Crystal Cove L M M L N L M L L L L
P -Laguna Coasl Wilderness Park L H M M L L L L L L L

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much preliminary protection as is practical in
critical areas while the more comprehensive
Phase I Mitigation Plans were being prepared.
Early action measures were usually those
measures that could be implemented using
available work force crews (manual labor pd.
marily). and focused on sediment and debris
COntrol. They included removal of debris from
drainages; cleaning out storm drains; protection
of storm drain inlets; construction of temporary
velocity reduction measures, check dams, and
sediment traps; and construction of sand bag
diversions.
The project authority had at least four
sources of labor for immediate action and re-
sponse; the California Conservation Corps
(CCCl, work release program crews, local
maintenance crews, and volunteer organiza-
tions. The project authority developed a pro-
gram of orientation, training, and oversight.
This resulted in the timely and safe implemen-
tation of early action measures.
These early action measures rypically were
not intended to eliminate. only reduce, damage
from rainfall-induced flooding and mud, rock,
and debris flows. It was recognized that the first
significant rainfall after the fire would result in
unexpectcd problems with increased flooding
and mud and debris flows. so trained personnel
wcre in the field to help citizens and assess
needed repairs and improvements in the early
action measures.
The next step in the process was co develop

Phase I Hazard Mitigation Plans, which are
comprehensive plans for a given area designed
to address the shon-term mitigation of geolog-
ic, erosion, and flood hazards caused by or exac.

Figure 6. Sediment re-
tention using gravel-
filled burlap bags

NOVEMBER. DECEMBER I"~ 539