How much 65% calcium hypochlorite is required to disinfect a water storage tank with a dosage of 50 mg/L, with the tank being 36 feet in diameter and 20 feet high?

To determine how much 65% calcium hypochlorite is needed to disinfect the water storage tank, the first step is to calculate the volume of the tank. Since the tank is cylindrical, the volume can be found using the formula for the volume of a cylinder:

[ \text{Volume} = \pi \times r^2 \times h ]

In this case, the radius (r) is half of the diameter, which is 18 feet (36 feet / 2). The height (h) of the tank is 20 feet. Plugging in these values:

[ \text{Volume} = \pi \times (18 \text{ ft})^2 \times (20 \text{ ft}) \approx 2036.56 \text{ ft}^3 ]

To convert cubic feet to gallons, knowing that 1 cubic foot is approximately 7.48 gallons, we multiply the volume by 7.48:

[ \text{Volume in gallons} \approx 2036.56 \text{ ft}^3 \times 7.48 \approx 15260.48 \text{ gallons} ]

Next, to find out how much calcium hypochlorite