Skip to main content

FRAMES logo
Resource Catalog

Document

Type: Journal Article
Author(s): Eric A. Miller
Publication Date: 2020

The Drought Code (DC) was developed as part of the Canadian Forest Fire Weather Index System in the early 1970s to represent a deep column of soil that dries relatively slowly. Unlike most other fire danger indices or codes that operate on gravimetric moisture content and use the logarithmic drying equation to represent diffusion, the DC is based on a model that balances daily precipitation and evaporation. This conceptually simple water balance model was ultimately implemented using a 'shortcut' equation that facilitated ledgering by hand but also mixed the water balance model with the abstraction equation, obscuring the logic of the model and concealing two important variables. An alternative interpretation of the DC is presented that returns the algorithm to an equivalent but conceptual form that offers several advantages: The simplicity of the underlying water balance model is retained with fewer variables, constants, and equations. Two key variables, daily depth of water storage and actual evaporation, are exposed. The English system of units is eliminated and two terms associated with precipitation are no longer needed. The reduced model does not include or depend on any soil attributes, confirming that the nature of the 'DC equivalent soil' cannot be precisely known. While the 'Conceptual Algorithm' presented here makes it easier to interpret and understand the logic of the DC, users may continue to use the equivalent 'Implemented Algorithm' operationally if they wish.

Online Links
Citation: Miller, Eric A. 2020. A conceptual Interpretation of the drought code of the Canadian Forest Fire Weather Index System. Fire 3(2):23.

Cataloging Information

Topics:
Fuels    Models    Weather
Regions:
Alaska    California    Eastern    Great Basin    Hawaii    Northern Rockies    Northwest    Rocky Mountain    Southern    Southwest    International    National
Keywords:
  • boreal forest
  • Canada
  • DC - CFFDRS Drought Code
  • fire danger
  • forest floor
  • fuel moisture content
  • FWI - Canadian Forest Fire Weather Index System
  • SMI - Soil Moisture Index
  • water balance model
Record Last Modified:
Record Maintained By: FRAMES Staff (https://www.frames.gov/contact)
FRAMES Record Number: 61478