And quantitative data collection methods are used to store, query, from a sample of the water system's water is mountains. 56, and water users, water systems, another region 21.
And quantitative data collection methods were collected from a sample of the water system and the water supply of 56 Mountain Water Authority's water system 21.
And the quantitative data using statistical samples from a user water water supply system 56 mountain). Regional water supply system and water users more 21 cases.