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  • LM Model Description
    decay representing the breakdown of these pollutants in the natural environment with time in the stream Indicator of the Soil Conditions in the watershed This variable of the model was derived from a factor analysis of the general soil groups as derived from the U S Natural Resource Conservation Service STATSGO database for Ohio Principal component analysis was used to summarize the soil properties The major component weighted heavily on hydrologic soil properties indicating water logging and low pH Stream Order Component This final variable of the model was a categorical variable to account for the presence of headwater streams If a sample point was located in a headwater stream a value of 1 was assigned to that point All other stream types were coded as 0 Data were analyzed in a linear regression model where the dependent variable was the IBI level and the independent or explanatory variables were those described above The final equation derived for this set of scenarios was IBI 27 013 0 925 Substrate 1 161 Pool 0 636 Urban 2 946 Soils 1 571 Point Loads 5 576 Stream The model explained 72 of the variance in the original data This means that there is about 28 of the system variation that remains unexplained by this model Sources of Error There are several sources of error in this model As indicated previously the model explains 72 of the variance Although this is very good for an empirical environmental model it does mean that the projected results reflect some inaccuracy A review of the errors in the model reveal several trends Errors are introduced in a number of ways First the datasets represent samples at a finite number of places in the streams for a limited number of times Given the nature of the sampling

    Original URL path: http://tycho.knowlton.ohio-state.edu/model.html (2015-11-11)
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  • Great Miami Scenarios
    the Ohio EPA Division of Surface Water The location of the watershed in relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Great Miami River and Loramie Creek Watershed is impaired primarily by habitat and flow alterations sediment deposition and nutrient enrichment These river and stream impairments are a direct result

    Original URL path: http://tycho.knowlton.ohio-state.edu/gmdes.html (2015-11-11)
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  • BD Scenarios
    in relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Big Darby Creek Watershed is impaired primarily by nutrient enrichment and sedimentation but other habitat alterations also significantly impact this watershed Over 90 of the rivers and streams in this watershed is affected by nutrient enrichment Such severe river and stream

    Original URL path: http://tycho.knowlton.ohio-state.edu/bddes.html (2015-11-11)
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  • LLM Scenarios
    location of the watershed in relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Lower Little Miami River Watershed is impaired primarily by nutrient enrichment and sedimentation Similar to the Big Darby Creek Watershed nearly 90 of rivers and streams are impacted by nutrient enrichment Such severe river and stream impairments

    Original URL path: http://tycho.knowlton.ohio-state.edu/llmdes.html (2015-11-11)
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  • walnut Scenarios
    the watershed in relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Walnut Creek Watershed is impaired by nutrient enrichment sedimentation and other habitat alterations Similar to many of the other watersheds the majority of the river miles are impacted by nutrient enrichment Such severe river and stream impairments commonly result

    Original URL path: http://tycho.knowlton.ohio-state.edu/waldes.html (2015-11-11)
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  • UO Scenarios
    of the watershed in relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Upper Olentangy River Watershed is impaired primarily by nutrient enrichment and stream and habitat alterations Similar to other watersheds the majority of the river miles are impacted by nutrient enrichment Such severe river and stream impairments commonly result

    Original URL path: http://tycho.knowlton.ohio-state.edu/uodes.html (2015-11-11)
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  • lo Scenarios
    relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Lower Olentangy River Watershed is impaired primarily by nutrient enrichment and habitat and flow alterations Nearly all of the river miles are impaired by nutrient enrichment and greater than 50 is also impaired by flow and other habitat alterations Such severe river

    Original URL path: http://tycho.knowlton.ohio-state.edu/lodes.html (2015-11-11)
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  • ott Scenarios
    EPA Division of Surface Water The location of the watershed in relation the other watershed throughout the state can also be seen in the small Ohio map on the top right According to the Ohio EPA in 2001 the Ottawa River Watershed is impaired primarily by nutrient enrichments affecting nearly all river miles Such severe river and stream impairments commonly result from human development inadequate agricultural practices and land use

    Original URL path: http://tycho.knowlton.ohio-state.edu/ottdes.html (2015-11-11)
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