Problem
You have 4 ponds and each pond has different water surface area. Pond 1 has a water surface area of 0.1 ha and depth of 90 cm, pond 2 has an area of 0.2 ha and depth of 110 cm, pond 3 has an area of 0.4 ha and depth of 120 cm, and pond 4 has an area of 1.0 ha and depth of 130 cm. Each culture period will be 4 months and there will be 2 cultures a year. Drying and pond preparation will be carried out in between every culture. Other information including weather and soil of the area are as follows:
1. daily evaporation rate is 2.5 cm
2. monthly rainfall is 35 mm
3. total area of pond including dikes exposed to rain is 3 hectares
4. soil seepage coefficient is 0.3 cm/day
5. water for the ponds is obtained from a dam 150 m away using a feeder canal with width of 0.6 m
Using the information and formulae given, calculate the volume of water in cubic meters (m3) needed in one year when all the ponds are operational.