Regression estimation of low flow in New Zealand

By: Hutchinson, P.D.
Material type: materialTypeLabelBookSeries: Publication ... of the Hydrology Centre, Christchurch ; no. 22.Publisher: Christchurch, N.Z. : Hydrology Centre, DSIR Marine and Freshwater, 1990Description: 51 p.ISSN: 0112-1197.Subject(s): REGRESSION ANALYSIS | LOW FLOWS | NEW ZEALAND | VARIABILITY | GROUNDWATER | MATHEMATICAL MODELS | WATER LEVELS | HYDROGEOLOGY | FREQUENCY ANALYZERS | CATCHMENTS | RAINFALL
Contents:
5 refs; 5 figs; 3 appendices
A method is described for estimating specific 7-day mean low flow for catchments that are ungauged or have records which are inadequate for reliable flow frequency analysis. New Zealand has been divided into 11 regions and a regression equation for specific 5-year 7-day low flow(SQ57) is developed for each region. Nine of the eleven regions use one or more slope variables, eight use catchment mean annual rainfall as an independent variable and eight use one or more hydrogeology variables. The standard error of prediction for 9 out of 10 catchments is 40% less for all regions and less than 30% for nine of the eleven regions. A procedure for estimating ungauged SQ57 using the regression equations and for obtaining estimates for other periods, is given in an Appendix. (auth)
In: Publication ... of the Hydrology Centre, Christchurch In: Publication ... of the Hydrology Centre, Christchurch
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Item type Current location Call number Copy number Status Date due Barcode
JOURNAL JOURNAL WELLINGTON
STACK
STACK NO. 22 1990 Available J03144
JOURNAL JOURNAL WELLINGTON
STACK
STACK NO. 22 1990 2 Available J010682

5 refs; 5 figs; 3 appendices

A method is described for estimating specific 7-day mean low flow for catchments that are ungauged or have records which are inadequate for reliable flow frequency analysis. New Zealand has been divided into 11 regions and a regression equation for specific 5-year 7-day low flow(SQ57) is developed for each region. Nine of the eleven regions use one or more slope variables, eight use catchment mean annual rainfall as an independent variable and eight use one or more hydrogeology variables. The standard error of prediction for 9 out of 10 catchments is 40% less for all regions and less than 30% for nine of the eleven regions. A procedure for estimating ungauged SQ57 using the regression equations and for obtaining estimates for other periods, is given in an Appendix. (auth)

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