Stormwater Treatment Assessment & Recommendation Profile
Explore a multi-criteria assessment (MCA) for integrated stormwater treatment systems, including risk summaries, financial comparisons, and implementation plans.
MCA Results
Slide 7 of 11
Option
Score
Option 1
2.2
Option 2
3.0
Option 3
4.6
Option 4
3.8
Addresses BOTH water quantity AND quality non-compliance
Highest score across ALL three assessment categories
Treats on-site, reduces discharge volume AND pollutant load simultaneously
Option 3 is the only holistic solution — others resolve one dimension of the problem, not both.
Risk Summary
Slide 8 of 11
Risk Category
Option 1
Option 2
Option 3
Option 4
Flooding / Quantity Risk
High
Medium
Low
Medium
Water Quality / Pollutant Risk
High
High
Low
Medium
Regulatory / Compliance Risk
High
Medium
Low
Low
Operational Risk
Medium
Medium
Low
Medium
Residual Risks Above Medium
YES
YES
NONE
YES
Option 3 is the only option with NO residual risks above Medium after mitigation.
Financial Summary
Slide 9 of 11
Discounted Whole-of-Life Cost Comparison
Option
Discounted Total Cost
Option 1
$1,243,600
Option 2
$958,200
Option 3
$771,485
Option 4
$892,300
No Revenue Generated
Stormwater infrastructure is non-revenue generating by nature — a BCR below 1.0 is expected and does not indicate poor value.
Value via Avoided Costs
Option 1 avoids $277,888/year in regulatory fines — quantifying the cost of inaction. Compliance is not optional.
Operational Enablement
Infrastructure upgrades unlock broader site operational continuity and regulatory approval for future development.
Justifying financials without a positive BCR requires framing value through avoided costs, compliance, and strategic enablement.
Recommended Option
Slide 10 of 11
OPTION 3
Integrated Stormwater Treatment System
$771,485 discounted total
MCA Score: 4.6 / 5.0
Resolves Both Non-Compliances
Only option addressing water quantity AND quality simultaneously — treating symptoms, not just one cause.
Lowest Whole-of-Life Cost
At $771,485 discounted, Option 3 delivers best long-term value despite higher upfront cost than do-nothing approaches.
Most Favourable Risk Profile
No residual risks above Medium post-mitigation. Every other option leaves unacceptable residual risks on the table.
Aligns with Strategic Plans
Consistent with both the Asset Management Plan and Environmental Management Plan — not just compliant, but strategically sound.
Option 3 is not simply the highest-scoring option — it is the only option that fully resolves the problem.
Implementation Plan
Slide 11 of 11
Month 0
Funding Approval & Project Initiation
Two-stage funding release model
Governance sign-off and project charter
Stakeholder notification
Months 1–7
Detailed Design & EA Amendment
Engage hydraulic design consultant
Environmental Authority amendment lodged
Design peer review and approval
Months 8–10
Procurement & Construction Tender
Open market tender model
Tender evaluation against pre-set criteria
Contract award
Months 12–18
Construction & Commissioning
Civil works and installation
System testing and commissioning
Compliance verification and handover
Critical path: EA amendment (Stage 2) governs overall schedule — any delay here directly impacts construction commencement.
Open market tender ensures competitive pricing. Two-stage funding release ties drawdown to milestone achievement.
- stormwater-management
- civil-engineering
- infrastructure-planning
- mca-analysis
- environmental-compliance
- project-management