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Urban Drainage and Flood Control District

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Rain & Stream Gage at Ralston Reservoir in Jefferson County. ALERT Gaging Stations ... Dissemination Example for Jefferson County, Colorado ... – PowerPoint PPT presentation

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Title: Urban Drainage and Flood Control District


1
Urban Drainage and Flood Control District
  • Early flash flood prediction, detection,
    notification warning for the greater
    Denver/Boulder metropolitan area since 1979

NOTE This slide contains Internet hotlink
2
Motivation
Big Thompson 1976145 dead or lost
Buffalo Creek 19962 lives lost
Cheyenne 198512 deaths
Rapid City 1972237 dead
3
Basic Elements of Warning Plan
  • Early detection and evaluation of the threat
  • Dissemination of the warning
  • Response by those at risk to the warning
  • All three elements must function properly or the
    plan will fail.

4
Flood Threat Recognition
Early Detection Evaluation For flash flood
threats this process needs to begin before it
rains for the warning process to be truly
effective.
5
ALERT Gaging Stationslocal vesting in the process
Rain Gage Maintenance
Rain Stream Gage at Ralston Reservoir in
Jefferson County
ALERT Stream Gage housed with USGS gaging station
on South Platte River in Denver
WeatherStationin Aurora
6
Boulder S. Boulder
Ralston
Westerly Toll Gate
Lena
Bear
Goldsmith/Harvard
Basin-specific flood warning plans
7
Denver/Boulder Area ALERT Systemautomated
real-time gage network
Flood Detection Networks 1978 Boulder Creek 1980
South Boulder Creek 1982 Lena Gulch 1986 Ralston
Creek 1987 Westerly Creek 1988 Toll Gate
Creek 1989 Goldsmith/Harvard Gulch 1989 Bear
Creek 1997 Douglas County
ALERT Stations Sensors 124 Rain Gages 69
Stream Gages 15 Weather Stations 6
Repeaters 8 Base Stations This extensive
network includes more than 260 sensors and145
stations.
8
ALERT Users in Colorado
9
Media Interest High in High Tech
10
Data Interpretation AidedbyGraphical Displays
11
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12
Visualization Emphasized
STORM Watch (Windows-based software by DIAD Inc.)
13
NOTE This slide contains Internet hotlink
alert.udfcd.org
14
Meteorological Support
  • Supplements NWS watches warnings
  • Maintains direct contact with local government
    emergency preparedness and response agencies
  • Tailors communications to specific jurisdictional
    concerns
  • Supports comprehensive multi-jurisdictional basin
    flood warning plans

15
Meteorologists monitor weather radar and other
real-time data sources to keep local officials
informed concerning threatening conditions.
16
Standard F2P2 Messages(relayed by voice and fax
to dispatchers)
MESSAGE 1 (Internal Alert) This is an advisory
message which is meant to inform key people that
weather conditions are such that flood producing
storms could develop later in the day. It will
be issued by HMS after consultations with NWS.
If HMS feels this weather advisory requires
priority handling by the communications
dispatcher, the message will be preceded with the
statement "THIS IS A RED FLOOD ALERT
MESSAGE." MESSAGE 2 (Flash Flood Watch) This
message indicates that a Flash Flood Watch has
been issued by NWS and/or HMS feels the risk is
high that a life-threatening flood may occur
later in the day. HMS will add any additional
information which is available. If HMS feels
this watch requires priority handling by the
communications dispatcher, it will be identified
as a RED FLOOD ALERT message.
17
MESSAGE 3 (Flash Flood Warning) This message
indicates that a Flash Flood Warning has been
issued by NWS and/or HMS feels that a
life-threatening flood is imminent. Again, HMS
will add any additional information which is
available. This warning message requires
priority handling by the communications
dispatcher (i.e. an automatic RED FLOOD ALERT).
MESSAGE UPDATE This message will be used by HMS
to update any of the previous messages,
particularly in the event of a disagreement
between HMS and NWS. For example, this message
can be used to narrow a watch or warning area as
more information becomes available or to provide
more site specific data and direction during an
event. If HMS feels this update requires
priority handling by the communications
dispatcher, it will be identified as a RED FLOOD
ALERT message. MESSAGE 4 (All Clear) This
message cancels the flood potential status. This
message is issued by HMS after consultation with
NWS and other entities involved with direct HMS
communications.
18
Standard F2P2 Message Forms
  • All F2P2 Messages are communicated by phone to
    dispatchers.
  • Standard forms are faxed to dispatchers prior to
    phone call to minimize the potential for
    misinterpretation.
  • Copies of forms are included with all
    District-support basin flood warning plans.

19
Other F2P2 Productsvia Broadcast Fax Web
  • Daily Heavy Precipitation Outlook (HPO) issued by
    1100 a.m.
  • Internal Message Status Report (IMS) replaces HPO
    when a Message is in effect.
  • Probabilistic Quantitative Precipitation Forecast
    (QPF) provides more detailed basin-specific
    information.
  • Storm Track (ST) provides hour lead describing
    movement, size, QPF and expected path.

NOTE This slide contains Internet hotlinks
20
Dissemination Example for Jefferson County,
Colorado
District Flash Flood Prediction Program
Weather/flood messages relayed by emergency
communication centers.More than 30 known point
contacts for Jeffco. Subsequent relays unknown.
Private Meteorological Service
21
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22
High Tech helps save lives, but it does not
replacethe need for the High Touch
observations andcommunications that people
provide.
23
Weather Station Mesonet
Used to predict flood potentials and storm
tracks, and to identify meteorological triggers
before if rains.
24
ALERT Weather Stationa forecast tool more
  • Precipitation
  • Wind Speed/Direction
  • Wind Gusts
  • Air Temperature
  • Relative Humidity
  • Dewpoint (calculated)
  • Fuel Moisture Temperature (fire weather)
  • Key pre-storm flood forecasting parameters

Hiwan Golf Coursenear Evergreen, CO
25
THE ALERTMESONET
26
August 17, 2000
How well does all this stuff really work?
27
Rocky Mountain News
  • August 18, 2000
  • August 19, 2000
  • August 22, 2000
  • Sept. 1, 2000

28
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29
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30
Building Relationships
38 Local Government PartnersPrivate
MeteorologistsMedia Others
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