WRENSS is name of the Water Resource Evaluation of Nonpoint Silvicultural
Sources methodology published by the US Forest Service and US EPA in 1980. (See the Handbook: An Approach to Water Resources Evaluation on Non-Point Silviculture Sources.)
The WRENSS handbook provides an analytical methodology that can be used to
describe and evaluate changes to water resources resulting from non-point
silvicultural activities. WRENSS covers only the pollutant generation and
transport processes and does not consider the economic, social, and
political aspects of pollution control.
This state-of-the-art approach for analysis and prediction of pollution from
non-point silvicultural activities is a rational estimation procedure that
is useful in making comparative analyses of management alternatives. These
comparisons are used in selecting preventive and mitigative controls and
require site-specific data for the analysis. The handbook also provides
quantitative techniques for estimating potential changes in streamflow,
surface erosion, soil mass movement, total potential sediment discharge, and
temperature. Qualitative discussions of the impacts of silvicultural
activities on dissolved oxygen, organic matter, nutrients, and introduced
chemicals are included. A control section provides a list of control
practices that have been used effectively and a methodology for selecting
mixtures of these controls for the prevention and mitigation of water
resource impacts.
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