Rain Gardens, Deep Soil and Coastal Constraints: Three‑Dwelling Subdivision in Port Stephens

How landscape documentation integrated subdivision, rain gardens, deep soil planning and coastal planting across a constrained Port Stephens development.

This project involved landscape documentation for a three‑dwelling residential development in Anna Bay within the Port Stephens Council area.

The proposal subdivided an existing residential allotment into two lots, resulting in one lot containing a single dwelling and the second accommodating two dwellings. While the overall scale of the development was relatively modest, the site presented a combination of challenges that required careful coordination between subdivision design, stormwater management, deep soil provision, and landscape outcomes.

Unlike many residential developments where space can be distributed evenly across the site, both resulting lots retained irregular shapes following subdivision. The landscape design therefore needed to work harder to ensure that deep soil areas, planting opportunities, private open space, and stormwater infrastructure remained functional rather than becoming fragmented pockets of leftover space.

When Odd-Shaped Lots Create Landscape Challenges

One of the key challenges on this project was the site geometry.

The original allotment already had an irregular shape, and the proposed subdivision created two separate lots with their own unique constraints. This immediately raised a common issue often seen in residential developments:

How do you create meaningful landscape outcomes when usable outdoor space becomes increasingly fragmented?

Without careful planning, odd-shaped lots often result in:

• fragmented planting zones

• isolated deep soil pockets

• awkward open space areas

• inefficient landscape maintenance

Rather than distributing landscape areas evenly across the site, the design focused on creating larger, more purposeful landscape zones wherever possible.

This helped create stronger visual structure, more usable planting opportunities, and better long-term landscape performance.

The final landscape strategy coordinated subdivision, deep soil allocation, private open space, rainwater harvesting and rain garden infrastructure across two irregular lots while maintaining practical outdoor spaces for all three dwellings.

Integrating Rainwater Harvesting and Rain Gardens

Another important component of the project was stormwater management.

Each dwelling was provided with its own rainwater tank, with runoff contributing toward a rain garden treatment system integrated within the broader landscape design.

Rather than treating water management solely as an engineering requirement, the rain garden became part of the landscape strategy itself.

This approach helped:

• support stormwater management outcomes

• increase landscape functionality

• contribute to site permeability

• create an environmentally responsive landscape solution

Projects such as this demonstrate how landscape documentation can help bridge the gap between planning requirements, engineering outcomes, and practical site design.

Why We Concentrated Deep Soil Rather Than Spreading It

A common assumption is that deep soil should be spread across a site wherever possible.

In practice, this isn't always the best landscape outcome.

In the Scott Project, the preferred approach was to consolidate as much deep soil as possible into larger planting areas near the front of the development.

This created several advantages:

• stronger canopy potential

• larger root zones

• improved streetscape presentation

• better long-term planting performance

Instead of creating numerous small planting pockets throughout the development, larger consolidated deep soil areas were able to deliver more meaningful landscape outcomes.

The remaining landscape areas incorporated lawn and practical open space, contributing to usability and reduced maintenance requirements.

Working With Existing Site Assets

One of the most valuable landscape features already existed before any new planting was proposed.

A substantial existing tree occupied a significant portion of the available deep soil area on one of the proposed lots.

While it may have been tempting to increase planting density around this area, doing so would have ignored the reality of the site's conditions.

The retained tree already provided:

• canopy cover

• visual softening

• environmental value

• established landscape character

Additional planting beneath and around this canopy would have experienced increased competition for light and resources while contributing limited additional benefit.

Instead, the design recognised the value already provided by the retained tree and allowed it to remain the dominant landscape feature within that portion of the site.

Sometimes good landscape design is knowing where not to plant.

Early site analysis identified existing vegetation, coastal conditions and irregular site geometry that would influence subdivision layout, deep soil placement, planting opportunities and long‑term landscape performance.

Designing for Coastal Conditions in Anna Bay

Plant selection was heavily influenced by the site's environmental conditions.

Anna Bay presents a combination of:

• sandy soils

• rapid drainage

• coastal exposure

• salt-laden winds

Species therefore needed to be capable of establishing successfully under these conditions while remaining practical for long-term residential ownership.

The planting palette focused on robust coastal species suited to free-draining soils and low-maintenance outcomes. This approach helps reduce long-term replacement costs while increasing the likelihood of successful establishment.

Rather than relying on species that perform well only under ideal conditions, the planting strategy was developed specifically around the realities of the site.

Lessons From This Project

The Scott Project demonstrates that landscape documentation is about more than simply allocating percentages and ticking compliance boxes.

The strongest outcomes emerged from understanding how each landscape element worked together:

• subdivision planning

• stormwater management

• rainwater harvesting

• existing vegetation

• deep soil allocation

• coastal planting

• future maintenance

When these elements are considered together early in the design process, landscape documentation can become a genuine contributor to site performance rather than a compliance exercise completed at the end of a project.

Related Project

View the complete Scott Project- Multi‑Dwelling DA Landscape Design project, including landscape plans, planting plans, rain garden integration, plant schedules, and subdivision documentation.

Scott Project- Multi‑Dwelling DA Landscape Design

Related Services

• Townhouse & Multi‑Dwelling Landscape Documentation NSW

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• Residential DA Landscape Documentation NSW