Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

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At what minimum elevation must potable water be stored to ensure a pressure of at least 35 psi?

50.55 feet
80.85 feet
100.00 feet
30.25 feet

The correct answer is: 80.85 feet

To determine the minimum elevation required for potable water storage to ensure a pressure of at least 35 psi, it is essential to understand the relationship between elevation (height) and pressure. Water pressure increases by approximately 0.43 psi for every foot of elevation gain. Therefore, to calculate the minimum height needed to achieve 35 psi, you can use the following formula: Height in feet = Pressure in psi / (0.43 psi/foot). Applying this formula, for 35 psi, you would compute: Height = 35 psi / 0.43 psi/foot ≈ 81.4 feet. Since the height must be a whole number, rounding to the nearest applicable value shows that approximately 80.85 feet of elevation will provide just enough pressure to meet the requirement of 35 psi. This selection addresses both the need for sufficient pressure to meet regulatory standards for potable water systems and practical considerations regarding the design of water storage facilities. By ensuring the water is stored at or above this elevation, the system operates effectively to deliver water with the required pressure throughout the distribution network.