MANAGING OUR ENVIRONMENT Nitrogen and Phosphorus Loads to Rivers in the Manawatu-Wanganui Region : An Analysis of Low Flow State : Technical Report to Support Policy Development Nitrogen and Phosphorus Loads to Rivers in the Manawatu-Wanganui Region: An Analysis of Low Flow State Technical Report to Support Policy Development August 2007 Authors Kate McArthur and Maree Clark Acknowledgements to Jon Roygard, Marianne Watson and the Environmental Compliance Team Internal Review Greg Bevin – Senior Environmental Compliance Officer Jeff Watson – Manager Resource Data External Review Bob Wilcock and Neale Hudson, NIWA Graham Sevicke-Jones, Hawkes Bay Regional Council Kirsten Meijer, Environment Southland August 2007 ISBN: 1-877413-81-X Report No: 2007/EXT/793 CONTACT 24hr Freephone 0508 446 749
[email protected] www.horizons.govt.nz Kairanga Palmerston North Dannevirke Cnr Rongotea & 11-15 Victoria Avenue Weber Road, P O Box 201 Kairanga-Bunnythorpe Rds Private Bag 11 025 Dannevirke 4942 Palmerston North Manawatu Mail Centre Palmerston North 4442 Levin 11 Bruce Road, P O Box 680 Marton T 06 952 2800 Levin 5540 Hammond Street F 06 952 2929 SERVICE REGIONAL P O Box 289 DEPOTS Pahiatua CENTRES Marton 4741 HOUSES Cnr Huxley & Queen Streets Wanganui P O Box 44 181 Guyton Street Pahiatua 4941 Taumarunui P O Box 515 34 Maata Street Wanganui Mail Centre Taihape P O Box 194 Wanganui 4540 Torere Road, Ohotu Taumarunui 3943 F 06 345 3076 P O Box 156 Taihape 4742 EXECUTIVE SUMMARY The growth of nuisance periphyton in many rivers and streams of the Manawatu- Wanganui Region is a significant environmental issue, requiring the reduction of nitrogen and phosphorus loads to surface water.