Groundwater Replenishment on the Canterbury Plains using the Tools - - PowerPoint PPT Presentation

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Groundwater Replenishment on the Canterbury Plains using the Tools - - PowerPoint PPT Presentation

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Groundwater Replenishment on the Canterbury Plains using the Tools of Managed Aquifer Recharge (MAR): Overview of Hinds MAR Pilot Project IAH presentation 8 th March 2016, Golder Associates Christchurch office, New Zealand Bob Bower,

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Groundwater Replenishment on the Canterbury Plains using the Tools of Managed Aquifer Recharge (MAR): Overview of Hinds MAR Pilot Project

IAH presentation – 8th March 2016, Golder Associates Christchurch office, New Zealand

Bob Bower, Principal Hydrologist (Golder) Patrick Durney, Senior Hydrogeologist, (CRC)

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Introduction – 2 Part Presentation

Overview – MAR and Sustainable Groundwater Management The tools of MAR Hinds Catchment Drivers MAR pilot project Why we modelled? What we have done (modelling) What we found Discussion session

Golder Associates | New Zealand

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Golder Associates | New Zealand

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Sustainable Groundwater Management

USGS – 1999 Sustainability of Groundwater Resources Basic Principles:

  • Water Budgets - balance
  • Catchment – scale
  • Conjunctive management

http://pubs.usgs.gov/circ/circ1186/pdf/circ118 6.pdf

Golder Associates | New Zealand

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A TOOLS OF MAR

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Various tools

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More tools

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The Tools

  • f MAR

The Tools

  • f MAR
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Managed Aquifer Recharge (MAR)

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Ground Water Replenishment Systems

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October 23, 2018 11

CAP Recharge Program, Arizona

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HINDS Plains Canterbury

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Golder Associates | New Zealand Golder Associates | New Zealand

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Nitrates

Area were baseflows need most support

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Overview MAR Pilot Project

I. II. III. I. II. III.

Transfer of Unused Craycroft Stockwater to RDR Intake Recharge water delivered through RDR and Valetta Schemes to MAR Site MAR Site operations guided by spring-fed waterbodies (drains): groundwater levels- rainfall- storm flow trigger condition set for ‘MAR shut down’.

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October 23, 2018 19

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Pacific Northwest: USA – Spreading Basins

Spreading Basin

Intake Overflow Monitoring Well

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Installed piezometer near pit for complementary testing of rates and Kv versus Kh

23/10/2018 21

Percolation testing #1

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Test pit Piezometer

SEEP/W Hydraulic Modelling simulation of Hinds test pit infiltration trial indicates lateral seepage flows are significantly greater than vertical flows

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Golder Draft modelling results

? Hard Pan layering ? ? ? Dashed line – wetting front of testing

23/10/2018 22

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Appears to be ~ 2 m below lip of quarry

Tarbottons Quarry (local) – 7 km down gradient

  • Local knowledge of hard pan (cemented

gravels) layer in Valetta Area

  • Further investigation indicates ~ 3 to 3.5 m bgl
  • Hard pan layering

Taken today – 5-June-2015

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Percolation testing #2

Results

  • Clamshell Holes (deeper)

– Piezometer (6.5 metres) – Pit (~5.0 metres)

  • Recovery curve indicates

500 L/s potential rate

  • Modelled rate ~2,000 L/s
  • Site variability will dictate

actual final rate

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Golder Associates | New Zealand Golder Associates | New Zealand

Conjunctive management conceptualisation

Outcomes:

  • Offset lost incidental recharge (e.g. piping)
  • Restore groundwater storage
  • Increase baseflows
  • Implement advanced on-farm practices

to reduce leaching

  • Dilution (nitrogen) with high quality alpine

source water

  • Build an integrated surface and

groundwater storage systems

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MAR Pilot – Next steps

  • 1 year ‘trial’ focus (ADC)
  • 5 year consents approved
  • Funding (CRC, Community, IAF (pending)
  • April construction
  • Research Partnerships – Lincoln Agritech,

Canterbury Health Board, Aqueon (Dillion)

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MARing the landscape

Managed Aquifer Recharge Modelling – Hinds Mid Canterbury

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This not this

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  • Hinds - Plan change 2

area.

  • 3 generations of model:

1. Manually calibrated MIKE SHE model used in support of plan 2. Expanded and refined, pilot point PEST calibrated MIKE SHE model 3. In build probabilistic model

Study area and modelling

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The problem: why model MAR

  • Provide analysis for community

discussion including a possible final MAR array design

  • To aid in understanding likely impacts of

MAR pilot including aiding the consenting process

  • Assess the actual effects of the trial and

the applicability to the rest of the catchment

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What we did and changes between models

  • 2 numerical SZ layers
  • manually calibrated SZ zones
  • Coastal streams modelled as

lumped drain codes

  • Extended and corrected boundary
  • 3 numerical SZ layers
  • Pilot point PEST calibrated SZ
  • Coastal streams modelled as rivers
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What we found

First model

  • Large volumes required to off set

declines in flow and groundwater level

  • 3.1 m3/s to offset lost incidental

recharge

  • 2.8 m3/s to off set groundwater

use

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Hinds Catchment: Groundwater Replenishment Programme GRS Focus Areas Upper Plains – large infiltration basins (water banking) Mid-Plains: ‘on-farm’ galleries

  • r smaller basins (nitrogen

mitigation and water banking) Coastal springs: basins/galleries (targeted baseflows and offset pumping)

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HINDS Plains Canterbury Ground Water Replenishment Scheme Modelling

MIKE SHE (DHI) Model Patrick Durney (2014, 2015)

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HINDS Plains Canterbury Ground Water Replenishment Scheme Modelling

4th Year

MIKE SHE (DHI) Model Patrick Durney (2014, 2015)

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MIKE SHE (DHI) Model Patrick Durney (2014, 2015)

HINDS Plains Canterbury Ground Water Replenishment Scheme Modelling

10th Year

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Ground Water Storage & Restored Baseflows

Groundwater storage and restored baseflows

Year 1 Year 15 Year 30

Change in storage (million m3) Spring-fed streams baseflows (m3/s)

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What about the trial then?

  • The second model suggests….
  • Up to 4.5 m head rise beneath

trial site outside of operational season.

  • Head will rise to just beneath

recharge basin during operation

  • Spring fed streams will pick up

water and mute head rise down gradient

  • There is low risk of groundwater

flooding because of the spring fed streams and the managed nature of the trial

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Generation 3

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This is the END!

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Discussion?

Golder Associates | New Zealand

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Staff photos before and after modelling the Hinds

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Discussion?

Golder Associates | New Zealand

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Golder Associates | New Zealand