More than mitigation:

Using irrigation modernisation to improve ecological resilience

Chris Solum (NVIRP)Emer Campbell (North Central CMA) Co-author

Overview• What is NVIRP?• What exactly is the problem here?• How are we managing this problem?• How did we get here?• A lot of help from our friends• Summary

What is NVIRP?

It’s this

• Source: G&M Poly PTY LTD

NVIRP Works Area

But is it this?

What’s the problem?• Big projects need to deal with their

environmental impacts• In our case that means mitigating ecological

impacts arising from hydrological changes• Can we do better than that?

So what was the solution?

Environmental Watering Plans• Ecological baseline hard to measure• Develop ecological objectives• Set a water regime to meet those objectives

– Use local and specialist expertise– Resilience boundaries identified (how long can a wetland

withstand being dry or wet without impacts to function) • Determine volume of water required

– Bathymetric surveys & daily time-step model for wetlands.– Flow study for waterways

Environmental Watering Plans• Assess hydrological impacts against preferred

water regime• Findings reviewed by an expert panel and

approved by Victorian Minister for Water, Federal Minister for Environment.

Outcome: An impact assessment that doubles as a high quality management plan

Mitigation Water• Was the previous operation good or bad?• Set aside volume of beneficial water• New entitlement type -> dedicated to env.Outcome: Impacts mitigated and water delivered when the environment actually needs it -> resilience improved

Environmental Infrastructure• Project is decommissioning circa 50% channels• Some channels are needed for env. Flows• Solution -> treat env. as a customer– We pay to reconnect plus O&M costs– Enhance supply infrastructure where practicable

Outcome: Env. water delivery assured, costs covered, water delivery better suited to ecological objectives

So how did we get here?• We didn’t have these outcomes in mind in the

beginning• No local precedents but lots of local

knowledge• A need to cover off legislative requirements

Environmental Technical Advisory Committee

• Agency-based• Empowered to fulfill role• Expectation of representing view of respective

organisations• Works to develop solutions to problems that

everyone can live with

Risk assessment - narrowing the field of view

• Legislative requirements – EPBC Act, EE Act• Looked at possible impact pathways such as direct and

indirect flows to environment and evidence of high environmental value

• Also looked at more abstract regional/cumulative impacts• Reduced potential sites from 1100+ wetlands and 20+

waterways down to 9 wetlands and 3 waterways ‘at-risk’

Development of a guiding framework

• Developed by NVIRP to be consistent with negotiated outcomes by ETAC

• Covers off on all described earlier and more• Consistent methodology• Sets out agreed roles and responsibilities• Jargon alert! – It’s adaptive

Development of a guiding framework

• Developed by NVIRP to be consistent with negotiated outcomes by ETAC

• Covers off on all described earlier and more• Consistent methodology• Sets out agreed roles and responsibilities• Buzzword alert! – It’s adaptive

Key messages• Be kind to your friends• Listen to the experts and local practitioners• Don’t constrain the scope too early• Mitigating impacts is ok; improving ecological

resilience better• The marginal cost difference between the two is

often negligible

Agency stakeholder acknowledgement

• Environmental Technical Advisory Committee– North Central CMA (also wrote EWPs)– Goulburn-Broken CMA (also wrote EWP)– Goulburn-Murray Water– Dep. Sustainability and Environment– Dep. Primary Industries– Parks Victoria.

Consultant acknowledgement• Sinclair Knight Merz (referrals, hydrology)• Hydro Environmental (short-listing ‘at-risk’

wetlands, groundwater impact assessment)• Feehan Consulting (short-listing ‘at-risk’

waterways, ongoing support)• Seran (framework development)