Peri-Urban Housing Scheme on Designated Agricultural Land
A development company has submitted a 40-hectare (about 99-acre) private housing scheme on land that the approved master plan designates as agricultural/green belt. The layout shows 900 residential plots averaging 250 sq yd, 55 commercial plots along the main road, 4% of gross area as open space, a 9 m internal road network, and an 18 m main access road connecting to a provincial highway. No site is reserved for a primary or secondary school, and stormwater is proposed to discharge into an existing natural drain that already serves 300 hectares upstream. The developer's population projection is 5,200 residents (about 130 persons per hectare gross). The development authority's planning standards require a minimum 10% amenity/open space, a school site within the scheme above 800 plots, and a drainage impact assessment where discharge to a natural drain is proposed. The developer argues that the land is already surrounded by built-up areas and that the scheme will meet a housing shortage. The file is before you as the reviewing town planner.
1. Classify the deficiencies in the layout into those that are fatal to approval as submitted and those that can be cured by condition. Justify each classification.
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The governing test is whether a defect attacks the legal basis of the scheme or can be corrected without re-planning it.
Fatal to approval as submitted
- Land use. The site is designated agricultural/green belt. A layout approval cannot override the statutory plan; the developer needs a separate master-plan amendment or a policy decision by the authority. This is not a condition on a layout.
- Open space. 4% against a 10% standard is a shortfall of about 2.4 ha on 40 ha. Absorbing that means deleting plots and re-planning the block structure - a redesign, not a condition.
Curable by condition or redesign
- School site. With 900 plots the threshold is crossed; a 1.0–1.5 ha site can be carved out by deleting plots, which is technically feasible.
- Road widths. The 9 m internal roads can be widened only by reducing plot depths; this is a conditional redesign that changes yield and must be shown on a revised layout.
- Drainage. Not a judgment call - it requires hydrological evidence before any decision. Treat as a hold point, not a refusal ground.
2. Recommend a decision on the application and set out the conditions and evidence you would require before any approval is signed.
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Recommendation: refuse as submitted, without prejudice to resubmission after a land-use amendment and a revised layout.
Reasons
- Inconsistent with the statutory land-use plan; approval would set a precedent for agricultural land conversion outside the amendment process.
- Open space below the minimum standard and no school reservation.
- Unresolved off-site drainage impact.
Conditions to attach to any future approval
- Evidence of a master-plan amendment or a written policy direction permitting residential use.
- Revised layout showing at least 10% open space, a school site of 1.0–1.5 ha, and a road hierarchy with 9 m internal roads widened to the standard or a reduction in plot depth.
- A drainage impact assessment covering the 300 ha upstream catchment, with on-site detention sized for at least a 1-in-25-year storm and a discharge limit agreed with the drain authority.
- Public notice and a hearing, because the application departs from the plan.
Before signing the approval, confirm in writing that the amendment is in force and that the drainage authority has accepted the discharge. Approval should be time-limited and bonded for infrastructure delivery.
3. The developer offers to pay for off-site drainage improvement in lieu of on-site detention. Assess whether this is an acceptable planning response.
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Payment in lieu is not automatically acceptable and should not be accepted as a substitute here.
The planning principle is that a development should not transfer harm downstream. The 300 ha catchment is already loaded; adding 40 ha of impervious cover increases peak flow, and money for a downstream upgrade does not guarantee that the upgrade is built before the houses are occupied.
Acceptable only if all of the following hold:
- A catchment-level drainage study shows that the downstream works will neutralise the increase in peak flow at the point of discharge, not merely at some point further away.
- The works are designed, costed and scheduled before occupancy, with a bond or escrow and a binding obligation on the developer.
- The drain authority and the downstream local government consent in writing.
- A maintenance arrangement exists for the works after handover.
Preferred response: require on-site detention and water-sensitive design first, and treat any off-site contribution as additional mitigation only. If the study cannot demonstrate neutral impact, refuse the drainage proposal regardless of the payment offered.