The total area of Walailak University is approximately 15,350,400 m². It is 1^st rank of university in Thailand having a tremendous area. Walailak University is located in the southern part of Thailand, a heavy rainfall area with average annual rainfall of 1956.5 mm. Each year we have been facing with flooding problem, so we have water resources management system to protect this problem and to keep amount of water in many detention ponds and canals as presented in figure above. For domestic water use in our university, we have our own waterworks system and a fully water treatment plant to treat waste water coming from academic buildings, laboratory buildings, dormitories, canteens, etc. The total water conservation area is approximately 1,338,832 m² and can keep amount of water is 9,690,746 m³. It is sufficient for domestic water use in our university all year round. Therefore, the ratio of the amount water conserved in university to total volume of rainfall in the area is approximately 30%.