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c � z <br /> . All three models use retention time <br /> of stormwater as the key predictive <br /> parameter of water quality <br /> enhancement value. None of the <br /> models has been calibrated for use <br /> in wetlands. <br /> Justification: The existing <br /> evaluation method was rejected on <br /> the basis that the advancing <br /> understanding of wetland water <br /> quality function has shown that key <br /> assumptions used in the model are <br /> no longer considered valid. <br /> An alternative was not specified on <br /> the basis of the: 1) lack of a <br /> clear advantage among any one of <br /> the three available models based on <br /> stormwater retention, and 2) the <br /> likelihood that any one of these <br /> models will soon be replaced or <br /> upgraded by a "better" model. <br /> • <br /> 2362161/WZO.WP/PLS 19 <br />