Steady state groundwater-stream interaction model for determination of the effect of groundwater abstraction on spring-fed stream flow in the Lake Poukawa catchment, Hawke's Bay

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SR_2010-003-pdf
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Minni, G.; Cameron, S.G.; Meilhac, C.; Zemansky, G.M. 2010 Steady state groundwater-stream interaction model for determination of the effect of groundwater abstraction on spring-fed stream flow in the Lake Poukawa catchment, Hawke's Bay Lower Hutt, N.Z.: GNS Science. GNS Science report 2010/03 38 p.

Abstract: A steady-state groundwater flow model of the Lake Poukawa catchment has been constructed using FEFLOW software. The model predicts stream depletion effects and the effect of Lake Poukawa inflow due to groundwater pumpage. The physical structure of the model was based on driller’s bore logs and geological map data. The model was calibrated against field measurements of groundwater level, stream flow rate and stream depletion effects. Output from the model indicates that pumping from five reference wells included in the model will cause total flow rate in five sub-catchments to decline by about 15%. (auth)