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Memorandum 3 <br /> Impvervious Limits <br /> February 9, 1990 <br /> worse than today' s. Figure 2 shows that imperviousness and <br /> chlorophyll levels associated with the February Plan are closer <br /> to the 2-acre development scenario than to the original 5-acre <br /> recommendation. <br /> CDM staff advise that the watershed model' s margin of error is <br /> about 10 to 15 percent. In other words, predicted water quality <br /> differences of less than 10 or 15 percent say not be "real. " <br /> Incremental differences between successive land use scenarios in <br /> Figure 3 are probably not real in a statistical sense, but the <br /> apparent difference between the "February Plan" (Scenario 7) and <br /> the original 5-acre CDM recommendation (Scenario 3) is . notable. <br /> As stewards of the community' s water supply, can we responsibly <br /> endorse a plan that the CDM model indicates will produce twice as <br /> such deterioration than the report originally recommended? <br /> 2V1 <br /> Edward A. H o l l and, A I CP <br /> -- Research & Planning Administrator <br />