1. The problem involves understanding the water tariff rates for different consumption levels under Level 1 Restriction for both Domestic and Non-domestic categories. 2. For Domestic users, the tariff rates increase with consumption brackets: 0-9 kl is free, 9-18 kl costs 25.05 per kl, 18-30 kl costs 33.90 per kl, 30-42 kl costs 39.02 per kl, 42-60 kl costs 41.75 per kl, and above 60 kl costs 44.70 per kl. Additionally, there is a fixed network access charge of 141.70. 3. For Non-domestic users, the tariff rates are 30.77 per kl for 0-10,000 kl, 29.20 per kl for 10,000-100,000 kl, and 27.22 per kl for consumption above 100,000 kl. 4. These tariffs can be represented as piecewise functions for each category, showing how the cost per kiloliter changes with consumption. 5. Understanding these rates helps calculate total water bills based on consumption by multiplying the volume in each bracket by the corresponding tariff and adding the network access charge for domestic users. Final answer: The water tariff structure is a stepwise function with increasing rates for domestic users and decreasing rates for non-domestic users as consumption increases, plus a fixed network charge for domestic users.