Industrial Zone (Pty) Ltd sought to develop two properties in Denver, Johannesburg, for light industrial purposes. A stream crossing both properties rendered much of the land undevelopable. Industrial Zone applied for environmental authorisation under section 24 of the National Environmental Management Act 107 of 1998 (NEMA), proposing to divert the stream along the southern and western edges through a grass-lined channel with weirs. It included two alternatives: (1) diversion through a cement-lined canal, or (2) leaving the stream undisturbed with a 30-metre buffer zone and building a bridge over it. On 13 December 2016, the Head of Department granted authorisation subject to the second alternative (no diversion). Industrial Zone appealed to the MEC under section 43 of NEMA, arguing the development was not economically feasible without stream diversion and that diversion would rehabilitate the polluted stream. The MEC dismissed the appeal. Industrial Zone then sought judicial review under PAJA.