Groundwater Recharge, Flow and Inter-Aquifer Leakage NAIS Community - - PowerPoint PPT Presentation

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groundwater recharge flow and inter aquifer leakage
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Groundwater Recharge, Flow and Inter-Aquifer Leakage NAIS Community - - PowerPoint PPT Presentation

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Groundwater Recharge, Flow and Inter-Aquifer Leakage NAIS Community Commi@ee Wednesday 10 th February 2016 Overview aquifer types recharge and groundwater flow drawdown by pumping bores inter-aquifer leakage bore construcLon

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Groundwater Recharge, Flow and Inter-Aquifer Leakage

NAIS Community Commi@ee Wednesday 10th February 2016

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Overview

  • aquifer types
  • recharge and groundwater flow
  • drawdown by pumping bores
  • inter-aquifer leakage
  • bore construcLon
  • transport of injected recycled water
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Two main types of Aquifers

Diffuse flow PreferenLal

  • r bypass flow

e.g. macropores, fractures, karst

POROUS MEDIA

e.g., sandstone

DUAL-POROSITY MEDIA

e.g., fractured shale or karst limestone

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Groundwater Recharge

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Groundwater Recharge

  • Recharge may be defined as #

“the entry of water into the saturated zone at the water table”

  • Diffuse recharge:

– widespread percolation through the soil zone

  • Localised recharge:

– focused due to water source or geology – streams – within bank and overbank flooding – karst features (e.g., sink holes etc.)

# Freeze and Cherry (1979)

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Recharge is only a small fracLon of Rainfall

Leaney et al. (2011)

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Groundwater in the Hydrologic Cycle

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Groundwater Flow Systems

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Groundwater Flow Systems

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Goyder InsLtute Project: Assessment of Adelaide Plains Groundwater Resources

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Groundwater moves very slowly!

Carbon-14 acLvity of groundwater samples (Goyder InsLtute Project: Assessment of Adelaide Plains Groundwater Resources)

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Drawdown around Pumping Bores

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Inter-aquifer Leakage

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Groundwater Management ObjecLves

  • Long-term resource availability
  • Maintaining groundwater throughflow to prevent

salinisaLon “hotspots”

  • Maintaining groundwater throughflow to prevent

seawater intrusion

  • Maintaining aquifer pressure to prevent inter-aquifer

leakage of water/salts

  • MAR is one opLon that may help achieve these
  • bjecLves
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Water Bore ConstrucLon

  • Mandatory Requirement
  • Good Industry Prac5ce
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Minimum Requirements for Water Bores

Unconfined aquifer bore Confined aquifer bore = injec5on bore

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InjecLng Recycled Water

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PredicLng movement of the freshwater “bubble”

  • Environmental

and/or applied tracers

  • Solute transport

modelling

  • Monitoring

InjecLon Well

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Aquifer characterisaLon for MAR

  • Key knowledge required:

– Aquifer physical properLes (K, T, S) – Aquifer salinity characterisLcs & chemical properLes (mineralogy, groundwater chemistry, redox etc.)

  • Proven techniques:

– Aquifer pumping tests – Aquifer core analysis – Groundwater sampling and analysis – Field and laboratory trials

  • CriLcal to establish reliable monitoring systems

and manage operaLons as required

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QuesLons?

Contact Details

  • Dr. Glenn Harrington

Director & Principal Hydrogeologist InnovaLve Groundwater SoluLons Pty Ltd. Office: 2/162 Hindmarsh Road, Victor Harbor SA 5211 Email: glenn@innovaLvegroundwater.com.au Phone: 0458 636 988