1 A supply zone is a geographically defined area within which water intended for human consumption comes from one or more sources and within which water quality may be considered as being approximately uniform. | |
2 The volumes are calculated as averages taken over a calendar year. | |
3 As far as possible, the number of samples should be distributed equally in time and location. | |
| Volume of water produced each day within a supply zone12m3 | Number of samples per year 3 |
|---|---|
| volume ≤ 100 | 1 |
| 100 < volume ≤ 100 | 1 |
| 1,000 < volume ≤ 10,000 | 1 |
| +1 for each 3,300m3/d and part thereof of the total volume | |
| 10, 000 < volume ≤ 100,000 | 3 |
| +1 for each 10,000 m3/d and part thereof of the total volume | |
| volume > 100,000 | 10 |
| +1 for each 25,000 m3/d and part thereof of the total volume | |