This paper addresses the need to model recharge to groundwater systems at the scale of whole catchments. It looks at developing the right conceptual model of how water moves through a given landscape for both homogeneous and heterogeneous catchments. One-dimensional recharge models and three-dimensional recharge models are considered. Discussion of which recharge modelling approach to use take in consideration of the availability of data, the nature of the questions being asked, and the expertise of the investigators.
Introduction to Catchment Scale Recharge Modelling
What's unique about this chapter?
Why model recharge at the catchment scale?
Why modelling and not measurement?
Approaches to Catchment-Scale Recharge Modelling
Getting the right conceptual model
Uniform catchment recharge modelling
Recharge modelling in heterogeneous catchments
Disaggregation of the catchment into landscape units
The hydrogeomorphic unit approach
Distributed parameter recharge modelling
Recharge estimates for the Loddon and Campaspe catchments
When are 3-D models necessary for recharge prediction?
Discussion
The need for a catchment-scale approach to recharge modelling
Model complexity
How to interpret and use recharge modelling output
Summary
References
Landcare groups, hydrologists, agronomists, local government engineers and planners, soil and agricultural scientists.
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