LOS ANGELES COUNTY DEPARTMENT OF PUBLIC WORKS
Water Resources Division
Facilities Section
2009- 2010 STORM SEASON
Date : 10/13/09 Prepared by: HR
Time: 1720 Hr Recommended by: MM
Approved by: PW
DEBRIS AND MUDFLOW POTENTIAL FORECAST:
Duration: 1700 Hour on 10/13/09 thru 1700 Hour on 10/14/09
Reference: National Weather Service (NWS) 4:00 PM OCT 13, 2009
La Canada, La Crescenta, Glendale
Tujunga, Acton Areas PHASE 1 SEE NOTE 15
NOTES:
Anticipate 1.5 inch of rainfall during the next 24-hour period per NWS forecast at Moorpark College.
Anticipate 1.5 inch of rainfall during the next 24-hour period per NWS forecast at Big Dalton Dam.
Anticipate 1.5 inch of rainfall during the next 24-hour period per NWS forecast at Pacoima Dam.
Anticipate 1.4 inch of rainfall during the next 24-hour period per NWS forecast at Saugus.
Anticipate 1.4 inch of rainfall during the next 24-hour period per NWS forecast at Big Rock Mesa in Malibu.
Anticipate 0.6 inch of rainfall during the next 24-hour period per NWS forecast at Avalon.
15. Potential mudflow/flooding on streets below the burned hillsides in La Canada, La Crescenta, Glendale,
Tujunga, Sunland, & Acton/Soledad Canyon.
GENERAL NOTES
The debris and mudflow potential forecast is based upon a review of watershed conditions and
weather forecasts from the National Weather Service and other weather predicting sources. It
represents conditions within the watershed that could lead to debris and mudflow events.
Debris and mudflows are highly unpredictable events. The following description is to assist
storm response Divisions and emergency response agencies to plan accordingly:
Phase 1 Small isolated debris and mudflows possible at specific locations. Streets
may be flooded or blocked by debris. Reports of debris on private
property may be received. Few, if any, structures may be endangered.
Phase 2 Moderate debris and mudflows possible at more widespread locations.
Some streets may be completely blocked by debris. Depending on
location and terrain, some structures may be endangered by debris and
mudflows.
Phase 3 The potential exists for significant debris and mudflows to be
widespread over specific areas. Streets may be blocked and considered
unsafe for travel. Many structures could be endangered by debris and
mudflows. Extreme caution should be exercised below uncontrolled
canyons due to sudden debris and mudflows.
For questions or further information, contact (626) 458-6164,
Monday through Thursday, 6:30 A.M. to 5:15 P.M. After hours telephone (800) 675-HELP.
Water Resources Division
Facilities Section
2009- 2010 STORM SEASON
Date : 10/13/09 Prepared by: HR
Time: 1720 Hr Recommended by: MM
Approved by: PW
DEBRIS AND MUDFLOW POTENTIAL FORECAST:
Duration: 1700 Hour on 10/13/09 thru 1700 Hour on 10/14/09
Reference: National Weather Service (NWS) 4:00 PM OCT 13, 2009
La Canada, La Crescenta, Glendale
Tujunga, Acton Areas PHASE 1 SEE NOTE 15
NOTES:
Anticipate 1.5 inch of rainfall during the next 24-hour period per NWS forecast at Moorpark College.
Anticipate 1.5 inch of rainfall during the next 24-hour period per NWS forecast at Big Dalton Dam.
Anticipate 1.5 inch of rainfall during the next 24-hour period per NWS forecast at Pacoima Dam.
Anticipate 1.4 inch of rainfall during the next 24-hour period per NWS forecast at Saugus.
Anticipate 1.4 inch of rainfall during the next 24-hour period per NWS forecast at Big Rock Mesa in Malibu.
Anticipate 0.6 inch of rainfall during the next 24-hour period per NWS forecast at Avalon.
15. Potential mudflow/flooding on streets below the burned hillsides in La Canada, La Crescenta, Glendale,
Tujunga, Sunland, & Acton/Soledad Canyon.
GENERAL NOTES
The debris and mudflow potential forecast is based upon a review of watershed conditions and
weather forecasts from the National Weather Service and other weather predicting sources. It
represents conditions within the watershed that could lead to debris and mudflow events.
Debris and mudflows are highly unpredictable events. The following description is to assist
storm response Divisions and emergency response agencies to plan accordingly:
Phase 1 Small isolated debris and mudflows possible at specific locations. Streets
may be flooded or blocked by debris. Reports of debris on private
property may be received. Few, if any, structures may be endangered.
Phase 2 Moderate debris and mudflows possible at more widespread locations.
Some streets may be completely blocked by debris. Depending on
location and terrain, some structures may be endangered by debris and
mudflows.
Phase 3 The potential exists for significant debris and mudflows to be
widespread over specific areas. Streets may be blocked and considered
unsafe for travel. Many structures could be endangered by debris and
mudflows. Extreme caution should be exercised below uncontrolled
canyons due to sudden debris and mudflows.
For questions or further information, contact (626) 458-6164,
Monday through Thursday, 6:30 A.M. to 5:15 P.M. After hours telephone (800) 675-HELP.
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