Table 7.29.

Illustration of how the site investigation and modelling approach may vary for different situations

SituationSite length scaleActionModelling
Number of monitoring wellsHydrotestingGroundwater qualityTime series dataGeophysicsRecharge/ infiltration estimateHydrology/ wider water balanceAnalytical solutionModelModel approach
Large industrial site or waste disposal (including contaminant migration)1 to >10 kmHighYYYPotentiallyYYYLarge-scale, likely complexRegional formations with upscaled properties
Regional aquifer recharge1 to >10 kmMedium to highYPotentiallyYPotentiallyYYPotentiallyLarge-scale, potentially complexRegional formations with upscaled properties
Small contaminated site (including old landfill)>1 kmMediumYYPotentiallyLikelyYPotentiallyYMedium-scale, potentially complexLocal deposits with upscaled properties
Tunnel infiltration and stability of slopes100 m to >1 kmLow to MediumYPotentiallyPotentiallyPotentiallyYYYIf required medium-scale, simple to complexExplicit deposits and/or local deposits with upscaled properties
Excavation infiltration10–100 mLowYUnlikelyUnlikelyPotentiallyPotentiallyUnlikelyYIf required local-scale, likely simpleExplicit deposits and/or local deposits with upscaled properties
Small-scale water supply10–100 mLowYYPotentiallyUnlikelyYPotentiallyYIf required local-scale, likely simpleExplicit deposits and/or local deposits with upscaled properties