Abstract
‘Performance standards’ regulate land development by measuring the outcome or value of a proposed development, unlike ‘design standards’ which regulate the physical form. A recent municipal planning study in the Pittsburgh, PA, area has proposed the measurement of a development site's ecological performance in terms of its composite existing and potential productivity, maturity and uniqueness. A table was made showing estimated values of these performance measures for each of the ecological community types and ‘site index’ levels in the municipality. Equations were proposed for comparing a development site's ecological performance before and after development, as a way of testing the development's impact. The allowable extents to which the site's performance could be reduced by a development were suggested. Alternative development plans for a sample site showed that a developer can comply with the proposed standards by making construction areas as small as possible and locating them on the pre-existing community types with relatively low performance levels.
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