CD 10 BMP Inventory - Implementation

The Lake Ann and Emma Excess Nutrient TMDL Report (Wenck Associates, Inc. 2011) determined the total phosphorus (TP) load into Lake Ann as 8,326 lbs/year. CD 10 has been identified as the largest contributing source of total phosphorus (TP) to Lake Ann (5,676 lbs/year). This constitutes over 68% of the total TP load entering Lake Ann. The total TP load into Lake Emma is 5,676 lbs/year. Lake Emma will require a 2,224 total TP load reduction, with a 1761 lbs/year load reduction from Lake Ann specifically given it is located directly upstream. Projects that reduce the amount of sediment (and associated TP) entering CD 10 will address the load reductions called for in the Lake Ann and Emma TMDL Implementation Plan (Wenck Associates, 2012). Based on current landowner interest and project adoption from the JD 15 BMP Inventory Implementation MDM Grant (C16-1476), our goal is the implementation of six (6) grade stabilization structures, eight (8) WASCOBS, and one (1) grassed waterway. If this goal is met, approximately 94.3 tons of sediment and 148.61 pounds of phosphorus will be removed from the total load entering CD 10 in a year. This reduction would account for 2% of the total TP load reduction called for in Ann Lake and 4% of the total TP load reduction for Emma Lake as called for in the Lake Ann and Emma Excess Nutrient TMDL Report (Wenck Associates, Inc. 2011).