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NATIONAL FIRE DANGER RATING SYSTEM (NFDRS)

ENERGY RELEASE COMPONENT (ERC) AND FUEL MOISTURE GRAPHS

 

Energy Release Component (ERC) Charts

ARIZONA NEW MEXICO SOUTHWEST AREA
[Graphic] - NFDRS Fuel Model G (Arizona) [Graphic] - NFDRS Fuel Model G (New Mexico) [Graphic] - NFDRS Fuel Model G (Southwest Area)
MOVING 3-DAY AVERAGE ERC CHARTS
** Graphs above are created using Fuel Model G (Short Needle / Heavy Dead) as the representative fuel model.  Graphs are posted Tuesday and Friday from March to October and Friday only from November to February. 

 


What is the Energy Release Component (ERC)?

The Energy Release Component (ERC) is based on the estimated potential available energy released per unit area in the flaming front of a fire. The day-to-day variations of the ERC are caused by changes in the moisture contents of the various fuel classes, including the 1,000 hour timelag class. 

The ERC is derived from predictions of

  1. the rate of heat release per unit area during flaming combustion and
  2. the duration of flaming.

100-Hr Time Lag Fuel Moisture

1000-Hr Time Lag Fuel Moisture

What is the Fuel Moisture Content?

The water content of a fuel particle expresed as a percent of the ovendry weight of the fuel particle.

What is the Time Lag?

The time necessary for a fuel particle to lose approximately 63 percent of the difference between its initial moisture content and its equilibrium moisture content.

What is the 100 & 1000-Hr Timelag Fuels measuring?

These fuels are used to estimate the slowly changing fuel moisture contents of the large fuel classes. Daily weather fluctuations have only a small impact on the moisture content of these fuels (especially the 1000-Hr), so they provide an estimate of slowly changing seasonal moisture trends.