1 I. Water Supply Networks and Facilities Topic I.2. Water Consumption: Norms, Regimes, and Design Flowrates Kinds of water consumption: §Potable water consumption §Industrial water consumption §Fire water consumption Basic factors, influencing water consumption: §Kind and scale of the consumer §Level of urbanisation and of the sanitary equipment of the buildings §Water prise and the way of water consumption measurement and payment §Climate and cultural level of the population §Water supply system management and current state of the assets

2 Water Consumption Norms Definition: Water volume used by one consumer (human, animal, bird) or needed for unit industrial production per definite period (day, hour, work period). General classification: I. According to the level of integration §Lump (integrated, general) norms §Specific (differential) norms II. According to the consumer §Norms for potable water for population §Norms for washing the streets §Norms for drinking water for workers at the industry §Norms for a client or visitor (at the restaurants, hotels - for settlements, mountain an see resorts) or a patient (at the hospitals) §Norms for fire water supply

3 Water Consumption Norms For settlements Functional type Watersupply norms of the settlement[ l/d.cap] Capital I II III IV V VI VII

4 Water Consumption Norms For fire water supply

5 Water Consumption Regime Definition: Water consumption variation during a definite period (day, year).

6 Water Consumption Regime Variability coefficients: §Coefficient of daily variability - K d K d = Q max,d /Q av,d §Coefficient of hourly variability - K h K h = Q max,h /Q av,h ;

7 Design Water Flowrates §Average (mean) daily flowrate - Q av,d Q av,d = N.q/1000, [m 3 /d] N - number of population q - water supply norm, [l/d.cap] §Maximum daily flowrate - Q max,d Q max,d = K d.Q av,d K d = 1 + 1,35/N 0,12 §Maximum hourly flowrate - Q max,h Q max,h = K h.Q av,h = K d. K h.Q av,h /24 Q av,h = Q max,d /24, [m 3 /h] Q av,h = K d.Q av,d /24, [m 3 /h]