When the pond has been filled there will be some loss of water 
through evaporation. Water evaporates from the surface of the pond 
into the air as water vapour. The amount of evaporation will increase 
with rising air temperatures, with higher winds and with greater air dryness.  x6705s01.htm

TABLE 2  Amount of water provided per day by various rates of water flow  x6705s02.htm

Expressed in l/s/ha as equal to (120 x 1 000 l)  86 400 s or 1.4 l/s/ha of pond area. 

The pond area (in ha) that can be maintained with a minimum water flow of 4 l/s can then be calculated as equal to: 
4 l/s  1.4 l/s = 2.8 ha of fish ponds.  x6705s02.htm

For 240 days, your storage will need to be 21.6 m 3 x 240 = 5184 m3 
Total water volume to be stored: 2 073 m3 + 5184 m3 = 7257 m3. x6705s04.htm