To calculate the maximum volume of water in a spherical tank with an 8.6-meter diameter, first determine the hydrostatic pressure at the bottom using the formula P = ρgh, where ρ is the water density (approximately 1000 kg/m³), g is gravitational acceleration (9.81 m/s²), and h is the height of the water column. Given that the maximum allowable hydrostatic pressure is 50 kilopascals, solve for the height of the water column, which is approximately 5.1 meters. Using the height, calculate the volume of the sphere with the formula V = (4/3)πr³, where r is the radius (4.3 meters). The final volume, rounded to the nearest 10 liters, will provide the answer for the maximum water capacity of the tank.