Hutt River at Kaitoke Methods of Obtaining Hydrological Evidence on Climate Change

III l~cw Zcaland hydrological data are classili!ed in five broad categories: water resour~es, channel stability, floods, catchment c;ondition, and suspended sediment or erosiOl~ measurements. A description of how the co\lection of data has been planned has been gliven elsewhere (Campbell 1960). The classihcation will assist the collection of eviden~e relating to climate change since confirrpatory or contradictory evidence may be sho!wn up by study of the different kinds of datil. The! methods which can be used will depend on the observer having a good 'understanding of the meaning and interpretation of eac!h 'kind of data and the subject is accorqingly dealt with here in each separate category. ", i, '