please solve part C using these numbers

From a CAD drawing, you determine these areas in square feet contained within the indicated contours for a detention pond: Contour Elevation (ft) Area within Contour (ft2) 538 11449 539 11777 540 12882 541 14762 542 15959 543 19740 What is the volume of storage between 538 ft and 543 ft? a. By the average-end-area method: 1.63 ac-ft Previous Tries You are correct. Your receipt no. is 149-7789 b. By the conic formula: 1.63 ac-ft You are correct. Previous Tries Your receipt no. is 149-6300 c. If the required storage volume for control of a 100-yr event is 1.22 ac-ft, what is the corresponding stage or water surface elevation if the conic formula is used for volume calculations? Submit Answer Tries 0/5 From a CAD drawing, you determine these areas in square feet contained within the indicated contours for a detention pond: Contour Elevation (ft) Area within Contour (ft2) 538 11449 539 11777 540 12882 541 14762 542 15959 543 19740 What is the volume of storage between 538 ft and 543 ft? a. By the average-end-area method: 1.63 ac-ft Previous Tries You are correct. Your receipt no. is 149-7789 b. By the conic formula: 1.63 ac-ft You are correct. Previous Tries Your receipt no. is 149-6300 c. If the required storage volume for control of a 100-yr event is 1.22 ac-ft, what is the corresponding stage or water surface elevation if the conic formula is used for volume calculations? Submit Answer Tries 0/5