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
