History
Historically about 60% of the Wellington region was covered with broadleaf forest. Karaka, kohekohe, ngaio and nikau trees were common but there were also rata, rewarewa and tawa with occasional podocarps like kahikatea and rimu. The whole sanctuary valley was covered with this sort of forest until European settlement of the area and the large fires in 1850 and 1860 that cleared the land to be used for farming. The lower reservoir, retained by an earth dam, was completed in 1878. Parts of the area continued to be farmed up until 1906 when the remaining catchment was purchased for the water works. The upper reservoir, retained by a concrete gravity arch dam, was completed in 1908. From this point, as the whole valley was a protected water catchment area for Wellington city, the slopes were revegetated with introduced trees and the native forest also began regenerating. The upper dam was decommissioned as a reservoir about 1991, the lower one in 1997.
The "Natural Wellington" project identified the reservoir catchment as having special significance because it is a large self-contained habitat suitable for a wide variety of native plants and animals. In 1993 a feasibility study was carried out by the Wellington regional and city councils and after public consultation in 1994 the idea of a sanctuary was given the go-ahead. The Karori Wildlife Sanctuary Trust was formed in mid 1995 to implement the proposed 'mainland island' wildlife sanctuary.
Read more about this topic: Zealandia (wildlife Sanctuary)
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—T.S. (Thomas Stearns)