During such work the company removed vegetation from the wetlands before the work and returned it afterwards, he said.
''We've got some very strict protocols in place about how we manage the vegetation on the Remarkables where we are doing work to make sure we preserve the biodiversity that's present and put it somewhere safe.
''In this case we're looking to increase the size of that wetland, which will encourage that vegetation to propagate further downstream.''
While the work would ''modify'' the wetland, it would not be destroyed, he said.
''Although it has been touched, the value of the wetland is actually in the biodiversity it hosts. That's what is important to us to preserve.''
The water might flow in a ''slightly different way'' afterwards, he said.
''NZSki has established a strong record of enhancing the biodiversity in our Ski Area Subzone through initiatives such as revegetation of native species, weed eradication including wilding pines, and pest control.''
The wetland in question represented 0.08% of the total wetlands in the subzone, he said.