Repeater

ETL 1110-2-540

30 Sep 96

(1/100) chance of being equaled or exceeded in any given

year.

Repeater

A radio receiver/transmitter combination used to relay radio

signals over or around obstacles to line-of-sight

communications.

Response Time

The amount of time available for floodplain occupants to

respond to a flood event after receiving a warning.

Stage

Water surface elevation above a specified datum (e.g., mean

sea level) at a specified location.

Stage - Damage Relationship

A chart or table relating flood damages expected when flood

stages reach the indicated elevations.

Stage - Discharge Relationship

A chart or a table used to convert measurements of water

surface elevation (stage) to estimates of volumetric flow rate

(discharge).

Software

Computer programs used to support flood warning - prepared-

ness activities.

Stream Gage

A device to measure the water surface elevation of a stream,

river, or reservoir (Figure B-2).

Telemetry

Transportation of data from a measurement site to a receiving

station using some appropriate communications link (i.e.,

Figure B-2. Typical pressure transducer stream gage

radio, satellite, telephone, meteorburst, etc.).

Warning

d.

A dam failure or other causative event makes

A message from the NWS that meteorological and/or hydro-

flooding imminent or is reported.

logical conditions exist that make a specific event imminent or

that the event is already occurring (e.g., Severe Thunderstorm

e.

Predictive procedures (hydrologic models etc.)

Warning, Flash Flood Warning, etc.).

indicate flooding.

For example, the NWS criteria for the issuance of a Flash

Watch

Flood Warning are:

A message from the NWS that meteorological and/or hydro-

logical conditions exist that make a specific event likely to occur

a. Flooding is reported.

(e.g., Severe Thunderstorm Watch, Flash Flood Watch, etc.).

b. Precipitation capable of causing flooding is indicated by

For example, the NWS criteria for the issuance of a Flash

radar and/or satellite.

Flood Watch are:

c. Observed rainfall approaches or exceeds NWS flash

flood guidance.

B-3