TY  - BOOK
AU  - Beable, M. E. 
AU  - McKerchar,A.I.
ED  - New Zealand. 
ED  - New Zealand. 
TI  - Regional flood estimation in New Zealand / 
T2  - Water & soil technical publication, 
PY  - 1982///
CY  - Wellington, N.Z. : 
PB  - Water & Soil Division, Ministry of Works & Development, 
KW  - FLOODS
KW  - DATA ACQUISITION
KW  - FLOW MEASUREMENT
KW  - MATHEMATICAL MODELS
KW  - FREQUENCY DISTRIBUTION
KW  - STATISTICAL ANALYSIS
KW  - NEW ZEALAND
N1  - 33 tables; 51 figures; 65 references; 6 appendices (with 35 references)
N2  - Extreme value type I (Gumbel) and type II distributions are fitted to annual flood peaks from 152 recording stations throughout New Zealand. By grouping catchments with similar flood frequency attributes, eight regions are suggested. These flood frequency regions tend to correspond with climatic regions. Further, after grouping all the eastern and all the western catchments into two larger flood frequency regions, there was enough data in each region to develop master curves that are extrapolated to T = 1000 years. These curves resemble curves drawn for catchments in eastern and western parts of the British Isles. Multiple regression equations are obtained for estimating Q as a function of catchment area and one or two catchment rainfall parameters. Single equations applied in each island have prediction errors which show geographical patterns. Thus nine mean annual flood regions are defined which tend to correspond to lithologic and climatic regions, and a regional equation is suggested for each. These equations and the regional curves are the foundation of a suggested design flood estimation method, which is illustrated with examples
UR  - http://docs.niwa.co.nz/library/public/wstp20.pdf
ER  -