Solve for number $2$ below and show calculations. The Rolling Creek river flows through two states Dahoma and Hampgon. Dahoma State relies on the manufacturing sector while Hampgan State relies on the agricultural and farming sector. Due to some changes in global trends, the manufacturing sector in Dahoma has slowed and the state of Dahoma has proposed to build a dam to increase its agricultural capacity, generate hydroelectric power, and provide construction jobs. However, the construction of this dam also displaces some of the families located on the floodplain and reduces the stream flows to the residents of Hampgon State. This has a significant impact on the residents of Hampgon as they rely on river flows to maintain their agricultural sector. In addition, this will impact the ecology as the migratory patterns of the aquatic life are disturbed. The State of Dahoma has asked your company to complete an impact analysis on the construction of the dam. They have picked two proposals as follows: $[$Assume a width of river $=8m]$

$\backslash$table$[[$Proposal I: Concrete dam,$\backslash$table$[[$Proposal II: Earth Dam $($mix of different$],[$Density of concrete $=2350k\frac{g}{m^3}$