1 appendix; 1 tab; 5 figs Available from Technical Information Office, Water and Soil Division, Ministry of Works and Development, PO Box 12041, Wellington

The Ministry of Works has established a network of experimental basins to study the hydrological characteristics of important soil-vegetation complexes of New Zealand. The effect of cultural changes on these characteristics has also been studied. Manukau City Experimental basin is located slightly south of Howick in the area administered by Manukau City within the Auckland urban area. The catchment consists of gently-rolling farmland ranging from 23 metres to 67 metres above sea level with a north-westerly aspect. This project was carried out to determine the influence of urbanization on flood peak discharges in particular and on the hydrological regimen in general, to investigate any increase in sediment transport and deposition which may occur during the ubanization period, and to provide data, for use in conjunction with data from the other six urban catchments in the Auckland area, for developing a mathematical model for the prediction of flood peak discharges for urban catchments