Analyses on control of water demand in an urban independent lake

Park lake water in urban is playing an important role in urban environment and residents´ life. The research was aimed at a park lake located in the north of China. As an independent lake, without natural water to supplement, the lake water was evaporated to the air and osmosis to the groundwater rapidly. So, we need to know how much to be supplemented to keep the sightseeing effects. The test shows that water level of the lake goes down with the temperature, humidity, wind power, bottom structure of the lake. Water loss in spring and autumn are faster than that in summer, and the calculation shows that 6.9 X 10⁴m3 was needed to supplement into the lake in order to keep the water level in a region, and that the supplementary will be 93% times of the water volume.