A cylindrical tank has a radius of 5 meters and a height of 10 meters. If the tank is filled with water to 70% of its capacity, what is the volume of water in the tank?
This question reflects growing interest in water storage efficiency and infrastructure across communities in the United States. As climate patterns evolve and demand for reliable water management increases, cylindrical tanks designed for durability and maximum volume are gaining attention. Their consistent shape offers structural advantages, making them common in utility, agriculture, and urban planning. Understanding their water capacity helps in estimating usage, planning maintenance, and making informed decisions about sustainable resource use.

Why a cylindrical tank of 5 meters radius and 10 meters height—filled to 70%—matters today isn’t just about volume; it’s about maximizing storage within physical constraints. Large cylindrical tanks deliver compact yet efficient solutions, especially in space-limited settings. With a 70% fill level, the usable volume represents a significant portion of total capacity, reflecting practical design choices that balance cost, functionality, and sustainability. This level matches common industrial and municipal needs, making it a relevant reference point for users researching water system capacities.

Let’s break down how to calculate the exact volume of water. A cylinder’s total volume is found using the formula: V = π × r² × h. For this tank, the radius r is 5 meters and the height h is 10 meters. Calculating the base area: π × 5² = 25π square meters. Multiplying by height gives total volume: 25π × 10 = 250π cubic meters. Since π is approximately 3.1416, total capacity reaches around 785.4 cubic meters.

Understanding the Context

Now, at 70% capacity, the water volume becomes 70% of 250π: 0.70 × 250π = 175π cubic meters. Using the approximate value of π, this equals about 549.78 cubic meters of water stored. This figure serves as a reliable benchmark for understanding how efficiently the tank supports daily use—