PDP were engaged by Ellesmere Sustainable Agriculture Inc. to assess the feasibility of connecting Jollies Brook to the Rakaia River Lagoon, with the aim of improving fish passage. Jollies Brook flows into a hapuā and does not typically flow freely to the sea. Presently, a culvert is in place designed to discharge Jollies Brook to the sea, however this is regularly blocked with gravels caused by wave action on the seaward side.