A model to estimate the total ecological risk in the management of water resources subject to multiple stressors

The disjunctive convolution of independent individual stressor risk is pres ented as a model to estimate the total expectation of ecological effect for a water resource, subject to several different and metrically disparate st ressors. This method makes use of the exposure and effect assessment data o f the risk assessment procedure for each individual stressor given that the end-point is the same. A hypothetical case study illustrates how total ris k could he used as an ecological goal-oriented tool in catchment management .