Lake Conestee, located in the Reedy River watershed, was formed after the construction of a stone masonry structure in 1892. Since its construction, several pollutants received and transported by the Reedy River have been accumulating at the bottom of the lake. Using the systems thinking approach, we can define the lake as the system of interest and the contaminated sediment at the bottom of the lake as the stock.

a. [10 pts] Describe three solutions for addressing the environmental issue related Lake Conestee, each focusing on one part of the system: (1) input; (2) stock; and (3) output.

b. [5 pts] Lake Conestee has an area of 20 acres (ac) and average depth of 2 feet (ft). The Reedy River has an average flow of 80 cubic feet per second (ft³/s) at Lake Conestee. In this context, what is the residence time (in hours) of the water in the lake? Note that Flow (Q) = Volume (V) / Time (T), and that 1 ac = 43,560 ft².