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I I I I I I I I I I I I I I I I I I I Implications for Pollution Although no sampling methods which linked specific pollutants with land use were conducted as part of this study, potential pollution sources can be determined by examining land use within the watershed. Pollution is often categorized as either point source pollution or non-point source pollution. Point source pollution is associated with industries or municipalities, whereby pollutants are discharged to natural waters through a pipe or ditch and can be measured and treated at a point (Brooks, 1991). There is no evident point source pollution along Trott Brook besides multiple storm sewers which can deposit organic pollution into the stream(Straug, 1996). Further monitoring at these sites is recommended to determine if these sewers represent a source of pollution in Trott Brook. The potential impacts along Trott Brook come from non-point source pollution, pollutants which accumulate in runoff as it flows over and under lands within the watershed and eventually empty into a stream. Potential organic pollutants in Trott Brook include human sewage from the multiple on.:.site septic systems accompanying the residential development; leaf litter; livestock runoff; and lawn or other yard organic wastes placed into the stream. Excessive organic material in a stream causes an increased biological oxygen demand and the ensuing decrease in oxygen available to organisms. This may limit the diversity possible within the stream. As well, the additional nutrients from the organic material can lead to cultural eutrophication which deprives stream life of light and oxygen (Brooks, 1991). Another category of potential pollutants of Trott Brook is inorganic pollution, defined as ...suspended and dissolved solids composed of silt, salts and other minerals carried into streams from streets or exposed soil (Mitchell and Stapp, 1990). This type of pollution could come from the many roads crossing Trott Brook, storm drains, surrounding agricultural fields, and any development which disturbs stream bank vegetation or increases soil erosion. Inorganic pollution can cause increases in turbidity, increase of the water temperature and can smother fish eggs and other bottom-dwelling forms of life (Mitchell and Stapp, 1990). Analyses of nutrient pollution was conducted with this study. A more 13