Typical breakdown of urban water demand Choose the most appropriate distribution of total system consumption among end-uses and losses in a typical planning study.

Introduction / Context:
While actual water-use fractions vary by city and year, planning guidelines often adopt representative percentages for preliminary sizing and tariff studies.

Given Data / Assumptions:

• No unusual industrial base dominating demand.
• Reasonable non-revenue water levels around 15% in planning figures.

Concept / Approach:
Domestic demand typically dominates. Commercial/institutional, public purposes, and unavoidable losses (non-revenue water) comprise the remainder. The provided split (50% + 25% + 10% + 15%) sums to 100% and matches a commonly cited planning template.

Step-by-Step Solution:
Check each fraction and confirm they form a plausible total.Recognize this is a representative planning breakdown, not a universal rule.

Verification / Alternative check:
Many bylaws and manuals use similar splits for initial estimates before calibrating with metered data.

Why Other Options Are Wrong:

• Choosing any single item ignores that all listed proportions are used together as a standard planning set.

Common Pitfalls:
Assuming losses are negligible; underestimating firefighting allowance and seasonal public uses.

Final Answer:
All the above