An unconfined aquifer has a porosity of 0.45, and specific yield is 0.25. The dimension(s) of the aquifer is: 60 m of length, and 80x2 m2 cross sectional area. Estimate the groundwater volume that can be withdrawn or available from the aquifer.

The objective of the question is to estimate the volume of groundwater that can be withdrawn from an unconfined aquifer given its porosity, specific yield, and dimensions.The volume of groundwater that can be withdrawn from an unconfined aquifer is determined by the specific yield of the aquifer. The specific yield is the ratio of the volume of water that can be drained by gravity to the total volume of the aquifer. It is expressed as a decimal or percentage.In this case, the specific yield is given as 0.25. This means that 25% of the total volume of the aquifer can be drained by gravity.The total volume of the aquifer can be calculated by multiplying its length by its cross-sectional area. In this case, the length of the aquifer is 60 m and the cross-sectional area is 80x2 m^2, which equals 160 m^2. Therefore, the total volume of the aquifer is 60 m x 160 m^2 = 9600 m^3.The volume of groundwater that can be withdrawn from the aquifer is then calculated by multiplying the total volume of the aquifer by the specific yield. Therefore, the volume of groundwater that can be withdrawn is 9600 m^3 x 0.25 = 2400 m^3.The volume of groundwater that can be withdrawn from the unconfined aquifer is 2400 m^3. This is calculated by multiplying the total volume of the aquifer (9600 m^3) by the specific yield (0.25).