Table 1.
Sampling points in the three study areas
| Hex River Valley | E* | River point high up the valley, towards the top of the production area |
| F | River point in the middle of the river's course through the valley, at densely agricultural area | |
| G | River point at lowest end of the valley, after confluence with a fresh river from pristine area | |
| L* | River point between F and G | |
| M* | River point – between E and F, before discharge of Bdr | |
| Ar | Farm reservoir near vineyards containing spring and mountain water | |
| Br | Farm reservoir containing mountain water near vineyard | |
| Cdr | Open surface drain (1 m); drains superficial vineyard run-off | |
| Bdr | Closed surface drain (1 m); drains vineyard run-off from farm and from neighbouring farms. | |
| Dd | Open farm dam receives water from the Hex River | |
| H | Shallow well (5 m deep), containing groundwater used for domestic consumption | |
| J | Tap at Irrigation Board offices: representing potable water supply to the valley from distant mountain dam close to Ceres | |
| K* | Point on another river near F | |
| Grabouw / Vyeboom | G1d | Dam receives irrigation drainage, flows into Palmiet river |
| G2d | Farm dam, water pumped from Palmiet. | |
| G3 | River point (Palmiet) in midst of intensive agriculture | |
| G4 | River point lower in the course of the Palmiet | |
| G5d | Dam receiving water from Palmiet river, other dams and irrigation run-off; purified for domestic use. | |
| G6b | Well (in Vyeboom) used by farmers for domestic use, 30 m in depth | |
| G7* | A stream flowing from agricultural area in Vyeboom into the Theewaterskloof Dam (supplies just over 50% of Cape Town's drinking water). The stream is part of the dam when the dam is full. | |
| G8t | Tap water using output of G5d | |
| G9 | River point on Palmiet after joining Krom | |
| Piketberg | P1b | Well (depth = 100 m) in intensive farming area; used for domestic water supply |
| P2d | Dam receiving well and surface water but near the top of the mountain | |
| P3b | Well (depth = 70 m) in intensive farming area; used for domestic water supply | |
| P4r | Stream running down the mountain from P2d through Moravian Mission and into the Berg River. Used for domestic consumption. | |
| P5r | Site on Berg River mid-way further on from P4r | |
| P6r | Site on Berg River at pumping station providing municipal water | |
| P7b | Well (depth = 100 m) on wheat farm on the plain below the mountain. | |
| P8r | Tap at water purification scheme at Wittewaters (Berg River) |
* River sites that could not always be sampled at a depth of 1 m