Variability of average consumption of water per resident in a multi-apartment residential buildings

Abstract

The article presents the method of determining the probability of the average daily water consumption based on the number of residents in multi-apartment buildings. It has been assumed that the average daily water consumption by a single resident of a building is a random variable with a normal distribution of the expected value q ¯ j https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003171669/5e4b93f8-894e-4a46-a920-1556958aaf2f/content/inline-math28_1.tif"/> and standard deviation S q ¯ j https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003171669/5e4b93f8-894e-4a46-a920-1556958aaf2f/content/inline-math28_2.tif"/> . Using those assumptions the distribution parameters for total (hot and cold) average daily water consumption per resident were determined. For the purpose of the study, the results of measurements of the average annual water consumption in 2019 from sixty-five residential buildings located in Szczecin were obtained. Knowing those parameters it is possible to determine the value of water consumption per resident in regard to its probability. The average water consumption per resident was calculated for probability levels of 90%, 95% and 99% in relation to the number of residents. The obtained results were compared on a graph.