Manawatu–Whanganui
The largest project portfolio in SAE's history is centred on Marton and the Rangitikei District - including three major subdivisions and multiple stormwater neutrality projects.
Regional expertise
SAE's Manawatu-Whanganui project base is the largest by project count in the portfolio. Most of this work is centred on Marton, where the firm has delivered multiple large-scale subdivision projects since 2021 and continues to win work across the Rangitikei District.
The regulatory environment in Rangitikei District involves Rangitikei DC (territorial authority) and Horizons Regional Council (regional) - both of which require separate approvals for subdivision and discharge. SAE understands both. The Horizons RC requirement for a 200-year flood design standard (versus the NZ-standard 100-year) has been applied on the Hereford Heights 90-lot subdivision and the Henderson Line project. Horizons RC resource consent for watercourse change was obtained on the George St Bulls project.
Pallic soils (Flaxtonford series) dominate the Rangitikei District - poorly drained, with low permeability. This shapes stormwater design: soakage is generally not viable, and detention (tanks or swales) is the primary mechanism. Datum reconciliation between NZVD2016 and WVD1953 has been an issue on multiple Rangitikei projects - the difference of 0.543 m at Marton is significant for finish floor level setting in flood-prone areas.
Coverage
NZS 4404:2010 supplemented by the RDC Land Development Addendum (2017); subdivision engineering plan approval; S224c certification. SAE has taken three Rangitikei subdivisions through multi-stage S224c certification and holds familiarity with RDC consent processing timelines and technical requirements.
200-year flood design standard; discharge consents for subdivision stormwater; watercourse change consents; wetland classification under NPS-FW 2020. Horizons RC resource consent was obtained for the George St Bulls watercourse change. The 200-year design standard has been applied across Henderson Line and Hereford Heights.
Project experience includes Bignell St, Whanganui and a Feilding concept. Enquire for current availability in these territorial areas.
Selected work
| Project | Type | Key detail |
|---|---|---|
| Henderson Line, Marton | Greenfield subdivision (70 lots, 2020–2025) | Box culvert vs dual 1050 mm circular - $600K saving; multi-stage S224c; construction supervision |
| Hereford Heights, Marton | Greenfield subdivision (90 lots, 2019–2022) | 200-year Horizons RC flood standard; datum reconciliation 0.543 m; multi-stage S224c |
| Kensington Road, Marton | Subdivision (41 lots, 2022–2026) | WSP wetland rebutted with 1942–1982 aerials; 500 m³ swale; NPS-FW compliance; multi-agency consent |
| Milne St Extension, Marton | Feasibility / rezoning (up to 400 lots, 2023) | 5 sub-catchments; pre-development 457 L/s → post-development 711 L/s; GHD WW review; NPS-FW wetland risk |
| George St, Bulls | Subdivision / stormwater (2024) | 290 m detention swale 1,020 m³; 300 mm→525 mm pipe; Horizons RC watercourse consent |
| Flower St, Bulls | 3-lot subdivision (2024) | Pallic soils; soakage vs kerb analysis; 11.5 m³ detention; NIWA RCP 6.0 |
| Rayner Lane, Marton | 9-lot brownfield (2024–2026) | Sewer easements; one-way access; S224c January 2026 |
| Pukepapa Rd, Marton | 6-lot subdivision | Full three-waters design; EPA approved; NZS 4404 |
SAE has completed more projects in the Rangitikei District than any other region. Enquire today.
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