The amount of water necessary for safe operation is based on peak water demand, though this occurs quite regularly. The operation cycle in a jar lasts for about 3–4 days starting on a low water current to reach its maximum before ending. The Chinese hatchery system needs no additional water supply because it operates when the jar section is not in use.
Type and number of device | Water demand per device | Total water demand | |||
Minimum | Maximum | Minimum | Maximum | ||
l/min. | l/min. | ||||
20 l jar | 10 | 2.0 | 7.0 | 20.0 | 70.0 |
60 l jar | 24 | 3.0 | 10.0 | 72.0 | 240.0 |
200 l jar | 8 | 5.0 | 12.0 | 40.0 | 96.0 |
1.3 m3 tank | 6 | 10.0 | 10.0 | 60.0 | 60.0 |
2.6 m3 | 2 | 15.0 | 15.0 | 30.0 | 30.0 |
Total water demand of the hatchery | 222.0 | 496.0 |
Thus the minimum water demand is | 3.70 l/s |
maximum water demand is | 8.30 l/s |
mean water demand is | 6.00 l/s |
The water supply of the hatchery is from tube wells. The pumping capacity is computed on the assumption that pumps operate 22 hours daily and 2 hours are for daily maintenance. The maximum daily consumption is: 8.30 l/s × 86 400 s = 32.6 m3/h = 9.05 l/s