Water Demand Estimation MCQ with answer and solution

Concept

Water Demand Estimation Factors and Components

Formula

N/A

Step-by-step solution

1. Read each statement regarding water demand estimation carefully. 2. Evaluate Statement 1: Per capita demand varies directly with climate conditions and living standards (True). 3. Evaluate Statement 2: Fire demand requires high flow rate for short periods, but its total annual volume is very small (False). 4. Evaluate Statement 3: Leakage losses in distribution networks significantly affect the total required supply capacity (True). 5. Conclude that statements 1 and 3 are correct and select Option (a).

Explanation

Statement 1 is correct because water usage increases in hotter climates and with higher standards of living. Statement 2 is incorrect because although fire demand requires high pressure for a short duration, its total annual volume is very small (less than 1–2% of total demand). Statement 3 is correct because pipe leaks and losses can significantly increase the total amount of water required to meet demand. Therefore, option A ("1 and 3 only") is the correct choice.

Shortcut

To easily remember water demand estimation rules, use the rule "Climate & Leaks Count, Fire Volume Low": - Climate & Living Standards: Directly affect per capita demand (hotter climates and higher living standards increase usage). - Fire Demand: Needs high pressure/rate, but total annual volume is tiny (\<1–2%). - Leakage Losses: Significantly increase the overall required supply capacity.

Common mistake

A common mistake is selecting option D by assuming that because fire demand requires high peak flow rates and pressure, it also accounts for a large percentage of total annual water consumption. In reality, fire demand represents less than 1–2% of total annual volume. Another frequent error is choosing option C by underestimating the impact of distribution leakage losses on required supply capacity.