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Application of SAC88 to estimating hydrologic effects of fire on a watersheds

SAC88 is a major revision of the Sacramento Model, which was developed in 1969 with minor revisions through 1973. Two of many 1988 changes make it possible to estimate hydrologic effects of a fire in a watershed where pre-fire parameters can be calibrated or estimated: (1) Evapotranspiration, treated as extracted from six root-zone layers under pre-fire conditions, may be limited to one to five layers in the burned area; (2) An infiltration-rate limiting value, large for an unburned area, may be substantially reduced for an area where high soil temperatures and ash are thought to have created hydrophobic soil surface conditions. The application of sample rainfall sequences under pre-fire and post-fire conditions may be used to evaluate hydrologic effects of fire or other drastic changes in watershed vegetation.