Agenda 11-02-23; 4-a - Resolution Endorsing Consensus Principles II for Revised Falls Lake Rules

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=28 bathymetry, constriction point monitoring of water movement and water quality from segment to segment of Falls Lake, and light extinction data. For example, Figure 3 shows the water depth information resulting from the UNRBA bathymetric study. This figure also shows how Interstate 85 and Highway 50 segment the lake into what is referred to below as the upper, middle, and lower lake segments. -LF,-: f 6 ¢ 4r fi 30 � mq 15 �y a Falls Lake Bathymetry pp . r Neuse River Basin Association own Figure 3. Falls Lake Water Depth The UNRBA invested approximately$3.5 million in the monitoring effort to fill data gaps in the previous monitoring and modeling effort and provide an improved understanding of the lake and the watershed. In addition to providing an annual report of the monitoring effort as it proceeded,the UNRBA developed a comprehensive monitoring report in 2019 that summarizes the monitoring data and special studies. These efforts provided a comprehensive database that covered the key nutrient-related water quality considerations of the lake, including nutrient loading summaries by source and through time, lake residence time, dissolved oxygen concentrations, and algal toxin data. The UNRBA's monitoring data, DWR data, and data collected by other organizations (NC State University Center for Applied Aquatic Ecology, and the cities of Durham and Raleigh), has been evaluated and included in the data evaluation. This data has been used to develop watershed loading and lake water quality simulation models. The research funded by the Collaboratory has also provided critical insight and understanding of the watershed and lake. Monitoring studies conducted by the US Forest Service in the watershed have provided important information regarding nutrient loading from forested areas. All of this has been incorporated into the UNRBA's evaluation of this 9