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This layer contains an easy-to-use input dataset for allocating the baseline nutrient loads and subsequent load reductions to meet the newly accepted TMDLs. This baseload layer summarizes the normalized outputs of a custom spatial-scale run of the Spatial Watershed Iterative Loading (SWIL) Model 4.0 to allow baseload allocation for stakeholders within the Banana River, North IRL, and Central IRL BMAPs. This layer contains period-of-record normalized mean annual and dry season (January - May) raw volumes, TN, and TP loads corresponding to direct runoff, baseflow volumes and loads. The temporal extent was from 2004 to 2017. The spatial extent covered all areas within the Brevard and Indian River County TMDL boundaries and partial areas of the Volusia and St. Lucie County TMDL boundaries. |
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This layer contains an easy-to-use input dataset for allocating the baseline nutrient loads and subsequent load reductions to meet the newly accepted TMDLs. This baseload layer summarizes the normalized outputs of a custom spatial-scale run of the Spatial Watershed Iterative Loading (SWIL) Model 4.0 to allow baseload allocation for stakeholders within the Banana River, North IRL, and Central IRL BMAPs. This layer contains period-of-record normalized mean annual and dry season (January - May) raw volumes, TN, and TP loads corresponding to direct runoff, baseflow volumes and loads. The temporal extent was from 2004 to 2017. The spatial extent covered all areas within the Brevard and Indian River County TMDL boundaries and partial areas of the Volusia and St. Lucie County TMDL boundaries. |
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This data set was compiled by Applied Ecology, Inc. |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><P STYLE="margin:0 0 7 0;"><SPAN><SPAN>To produce the baseload layers that will allow estimating baseloads (and subsequently load reductions) from small BMPs, such as swales, relatively small input grid cells must be utilized in the basin layer that is one of the inputs to the custom SWIL 4.0 model run. Previous efforts determined the polygon grid cell size to be acceptable at 2500 square meters. A grid layer of 50-meter by 50-meter cells was created to cover the entire spatial extent. This resulted in over 1 million grid cells to cover the entire watershed. It is important to note that partial grid cells along the extent boundary with an area of less than 500 square meters were removed from the grid layer prior to model execution due to limitations of the SWIL model. For those partial grid cells, values were calculated post-model execution utilizing the normalized loads of the closest adjacent grid cell to assign an accurate load.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>In order to efficiently run the model with this large of a basin (grid) count, mean rainfall and ET rasters were created for years 2004-2017. This allowed the model to be executed as a single year. Aggregated rainfall rasters were created by averaging the identical months for each year for the POR (2004-2017). For the evapotranspiration rasters, the MOD 16 data product is only available for the years of 2000-2014. To account for this lapse in data from 2015 to 2017, monthly mean rasters were created for the POR in which the measured ET data was available (i.e. the average of identical months for every year from 2000 to 2014). The mean POR ET rasters were then used for years 2015-2017. </SPAN></SPAN></P><P /><P STYLE="margin:0 0 11 0;"><SPAN>Once the model outputs were generated by the execution of the model, the period -of-record mean annual and dry season (January - May) tabular values were joined to the spatial grid cell layer. </SPAN><SPAN>The outputs of each grid cell was then normalized by using the area of each grid cell. </SPAN><SPAN>The</SPAN><SPAN> normalized</SPAN><SPAN> results included in this layer are representative of annual and dry season (January through May) sums for direct runoff, baseflow and total (direct runoff + baseflow) values of three parameters (volume, total nitrogen (TN), and total phosphorus (TP)) per grid cell. </SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>A verification model run was performed in order to validate the results of the basin load layer. The verification model run consisted of using the complete monthly (2004-2017) temporal extent for the rainfall and ET rasters for three relatively small areas and comparing the outputs to the basin load layer. The results of the verification analysis demonstrated no significant difference whether average rasters were used or all the monthly rasters for the entire POR were used.</SPAN></P></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 7 0;"><SPAN>These data were not collected under the supervision of a licensed Professional Surveyor and Mapper. Use of these data requires a general understanding of GIS. This information is provided "as is". </SPAN></P></DIV></DIV></DIV> |
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| title:
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BMAP_Crediting_Areas_Mary_Combined_Union_Dissolve |
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| tags:
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["Direct Runoff","Baseflow","Volume","Total Nitrogen","Nitrogen","Total Phosphorus","Phosphorus","Load Allocation","Brevard County","Volusia County","Indian River County","St. Lucie County","TMDL","Indian River Lagoon","Banana River"] |
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en-US |
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150000000 |
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