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Open AccessFeature PaperArticle

Modelling Recharge from Irrigation Developments with a Perched Water Table and Deep Unsaturated Zone

1
Grounded in Water, 2/490 Portrush Rd, St Georges, Adelaide, SA 5064, Australia
2
CDM Smith, Level 2, 238 Angas Street, Adelaide, SA 5000, Australia
*
Author to whom correspondence should be addressed.
Water 2020, 12(4), 944; https://doi.org/10.3390/w12040944
Received: 2 March 2020 / Revised: 23 March 2020 / Accepted: 24 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue Rainfall Infiltration Modeling)
Modelling of recharge under irrigation zones for input to groundwater modelling is important for assessment and management of environmental risks. Deep vadose zones, when coupled with perched water tables, affect the timing and magnitude of recharge. Despite the temporal and spatial complexities of irrigation areas; recharge in response to new developments can be modelled semi-analytically, with most outputs comparing well with numerical models. For parameter ranges relevant to the western Murray Basin in southern Australia, perching can reduce the magnitude of recharge relative to irrigation accessions and will cause significant time lags for changes to move through vadose zone. Recharge in the vicinity of existing developments was found to be similar to that far from existing developments. This allows superposition to be implemented spatially for new developments, thus simplifying estimation of recharge. Simplification is further aided by the use of exponential approximants for recharge responses from individual developments. View Full-Text
Keywords: hydrology; irrigation recharge; perched water tables; groundwater modelling; vadose zone hydrology; irrigation recharge; perched water tables; groundwater modelling; vadose zone
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Walker, G.R.; Currie, D.; Smith, T. Modelling Recharge from Irrigation Developments with a Perched Water Table and Deep Unsaturated Zone. Water 2020, 12, 944.

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