The Wairau Valley in Marlborough boasts a wealth of heritage and ecological treasures. PDP were engaged to design the realignment of a stream situated within a vineyard section of the Wairau Valley. Birch Hill Stream is the main watercourse on the property and flows from west to east. The stream is intermittent, with two further intermittent streams joining it on the property before it flows into the Wairau River. The two intermittent tributary streams are fed from the hills on the southern boundary of the site and two marsh wetlands were also confirmed on the site, fed by the intermittent streams. Historically, agricultural land use provided stock with access to the wetlands and streams.