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METHOD USED TO ASSESS IMPLEMENTATION <br /> A GIS,model-based methodology was employed to characterize the nitrogen <br /> load reductions associated with recommended fertilizer restriction <br /> implementation within the Tampa Bay watershed.This methodology was similar <br /> to that used to estimate nonpoint source pollutant loads to ungaged portions of <br /> the watershed from previous load estimate reports generated for the Tampa Bay <br /> Nitrogen Management Consortium and to fulfill Reasonable Assurance <br /> submittals to FDEP(Zarbock et al. 1994,1996b;Pribble et al.2001;Poe et al. <br /> 2005;Janicki Environmental 2008). <br /> Specifically,the model estimates were generated to determine the nitrogen load <br /> reductions expected across typical urbanized land uses(Table 2)and areas in <br /> the watershed(Figure 1)that would be subject to the June 1—Sept.30 rainy <br /> season prohibition of nitrogen fertilizer application.A range of estimates of <br /> compliance(10%-75%)and fertilizer contribution(10%-79%)to run-off derived <br /> nitrogen loads were used to develop the estimates.These ranges encompassed <br /> the purported compliance rates and fertilizer contributions to surface water runoff <br /> that were found from a literature survey as described above. <br /> Table 2: Urbanized land uses as identified from the 2006 SWFWMD Land Use/Land <br /> Cover GIS database using the Florida Land Use and Cover Classification System <br /> (FLUCCS;SWFWMD 2006)and their associated Coastal Land Use Codes, <br /> descriptions,and expected total nitrogen event mean concentrations(mg/L)as <br /> utilized by the TBEP to generate load estimates to Tampa Bay(Poe et al.2005). <br /> Florida Land Use Coastal TBEP Total <br /> Cover FLUCCS Code Land Use Nitrogen Event <br /> Classification Description Code CLUC Description Mean <br /> Code <br /> (FLUCCSCODE) (CLUC) Concentrations <br /> (mglL) <br /> 1100 RESIDENTIAL LOW DENSITY<2 1 Low Density Residential 1.90 <br /> DWELLING UNITS <br /> 1200 RESIDENTIAL MED DENSITY 2->5 2 Medium Densi Residential 2.23 <br /> DWELLING UNIT h' <br /> 1300 RESIDENTIAL HIGH DENSITY 3 High Density Residential 2.08 <br /> 1700 INSTITUTIONAL 7 Institutional 1.18 <br /> 1800 RECREATIONAL 8 Range/Open Lands 1.19 <br /> 1820 GOLF COURSES 8 Range/Open Lands 1.19 <br /> 1900 OPEN LAND 8 Range/Open Lands 1.19 <br /> 6 <br />