# Merrimac WRC Stormwater Upgrade Business Case
> A comprehensive business case for upgrading stormwater infrastructure to achieve regulatory compliance and environmental sustainability at Merrimac WRC.

Tags: stormwater-management, business-case, environmental-compliance, infrastructure-investment, waste-management, sustainability, risk-assessment
## Merrimac WRC Stormwater Upgrade
* Business Case Presentation by Dominique Sleaford, May 2026.
* Current status: Operating under General Environmental Duty (GED) with stormwater non-compliance in water quantity and quality.

## Project Scope
* **In Scope:** Stormwater capture, treatment systems, water quantity management, EA amendment process, and commissioning.
* **Out of Scope:** Broader STP civil works, potable water, and long-term maintenance.

## Options Assessment
* **Option 1:** Do Nothing ($1,388,440 total cost due to $277,888/yr fines).
* **Option 2:** Minimum Compliance ($930,000) - Water quantity only.
* **Option 3 (Recommended):** Integrated Treatment ($771,485) - Quantity + Quality via wetland/bio-retention.
* **Option 4:** Advanced Treatment ($1,060,000) - Includes water reuse.

## Multi-Criteria Analysis (MCA)
* Evaluation based on Technical, Environmental, and Financial categories.
* Option 3 scored highest (4.6/5.0) as it resolves both non-compliances at the lowest whole-of-life cost.

## Financial Summary
* Investment justified through cost avoidance and risk elimination.
* Option 3 represents the lowest discounted total cost at $771,485.

## Implementation Plan
* **Stage 1 (Month 0):** Funding Approval & Project Initiation.
* **Stage 2 (Months 1-7):** Detailed Design & EA Amendment.
* **Stage 3 (Months 8-10):** Procurement & Construction Tender.
* **Stage 4 (Months 12-18):** Construction & Commissioning.
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