(1)(a) The maximum capacity of the Teebus Tunnel is 40 m3/s.
(b) The volumes being diverted vary per operational year. The table below indicates the volumes (million m3/annum) diverted over the past six years:
Year |
2014-2015 |
2015-2016 |
2016-2017 |
2017-2018 |
2018-2019 |
2019-2020 |
Volume Million m3/a |
757 |
779 |
756 |
727 |
774 |
801 |
(2) The maximum transfer capacity through the tunnel is only implemented when both Gariep and Van Der Kloof dams are spilling in order to maximise the use of water resources and improve the water quality. The monthly transfers are based on the water requests from the Great Fish Water Users Association (GFWUA), Lower Sundays River Water Users Association (LSRWUA) coupled with domestic water use and calculated dilution requirements to maintain the acceptable water quality provided to the LSRWUA.
(3)(a) The total volume of water from the scheme that has been allocated per annum is as follows:
(b) For the Lower Sundays River Water Users Association, the current scheduled area for the LSRWUA is 18 845 ha at 9 000 m3/ha/a (170 million m3/a).
(c) For the Glen Melville Dam 1.1 million m3/a is allocated to supply Grahamstown.
(d) The Lower Fish Permit Area is part of the Great Fish River Water Users Association with the scheduled area of 32 565 ha, amounting to an allocation of 426 million m3/a.