Key facts

Signs a field needs drainage work

Every SEQ oval goes soft after a big storm. A drainage problem is when it stays unplayable long after. Look for:

• Ponding and lost fixtures after moderate rain.
• Compaction and weeds. A hard surface, shallow roots, and crowsfoot in the worn centre corridor.
• Uneven levels. Low spots hold water and goal mouths turn to mud.
• Poor cover. Thin turf that never recovers between seasons.

At Colleges Rugby Union the cause was a shallow layer of compacted topsoil over impermeable clay, common on older SEQ ovals.

What is sand slit drainage?

Sand slit drainage is a system of narrow trenches cut across a field’s pipe drains and backfilled with sand, or with gravel capped by sand. The slits carry surface water straight through compacted topsoil and clay to the gravel and pipes below, instead of letting it sit on the surface.

How sand slit drainage and pipe laterals work together

A well-drained field relies on three things working together.

1. Surface falls shed the water first

The surface is shaped so water runs off before it soaks in. Football Queensland’s Natural Turf Football Pitches Construction and Management Guideline recommends no more than 1 in 200 along the line of play and 1 in 100 across it, with 1% as the preferred maximum grade. It accepts up to 1 in 50 on community pitches. On our jobs, finished falls have ranged from 1% (Clive Berghofer, Sheldon College) to 1.2% (North Pine) and 1.4% on a crowned rugby field (Colleges).

2. Pipe laterals carry water away

Perforated pipes in gravel-filled trenches run across the field into a collector or ring main, then to an outlet. On our projects, lateral spacing has ranged from 8.5 m (North Pine) to 10 m (Clive Berghofer, Bob Brock soccer field) and 14 m (Colleges Rugby Union).

3. Sand slits connect the surface to the pipes

The Football Queensland guideline describes retrofitted slits about 75–100 mm wide and 250 mm deep, spaced as close as 1 m apart. At Sheldon College we installed 50 mm wide gravel bands at 500 mm centres and 200 mm deep, with a machine that cuts, backfills and compacts three slits per pass.

That’s why laterals alone often disappoint: on clay, water can’t move sideways to a pipe 10 or 14 m away. At Colleges the budget covered laterals first, mainly to outlet a close-spaced slit system added later.

Why Queensland clay and storms make this harder

Many SEQ ovals are thin topsoil over heavy clay, and summer storms drop a lot of rain fast. Slits need regular sandy topdressing so they don’t cap over. We install sand slit drainage systems and pipe laterals on school, club and council fields across Brisbane, the Sunshine Coast and South East Queensland.

What a renovation involves

A renovation keeps the existing subgrade and fixes the top of the profile. Our usual order of work is:

1. Assessment. A levels survey, soil tests and a check for underground services such as floodlight cabling.
2. Weed kill and scalping of the old sward.
3. Decompaction. At Colleges we ripped to 300 mm and cultivated to 200 mm (see our site and soil preparation service).
4. Laser or GPS levelling. The field is reshaped to its design falls before any drains go in.
5. Drainage. Collector drains and laterals first, then sand slits across them, now or as a funded second stage.
6. Returfing and topdressing, with fertiliser and amendments guided by the soil tests.

It’s the same principle as topdressing and levelling a bumpy lawn, at field scale.

When a full rebuild is the smarter spend

The Football Queensland guideline says that where site shape and soil are poor, the ideal is a complete reconstruction. Where the shape is OK and the soil is reasonable, a network of subsurface drains through the surface may be enough. It also notes a tipping point where retrofitting costs approach a proper rebuild. A rebuild is usually the better spend when:

• the field is flat or badly shaped, and falls can’t be fixed without major cut and fill;
• the subgrade is badly compacted or has failed, or there’s too little depth of workable soil;
• you’re changing the layout, such as adding a running track or reorienting pitches;
• the field needs to play soon after heavy rain, which calls for a sand rootzone over full drainage.

For the full construction process, from survey to handover, see our sports field construction guide for Queensland.

Real QLD examples

Colleges Rugby Union, Ashmore: renovation

We ripped, laser graded to a 1.4% crown, installed laterals at 14 m centres to take a future slit system, and returfed 7,700 m² of Wintergreen couch. The work was finished in three weeks. Read the Colleges Rugby Union case study.

Clive Berghofer Stadium, Toowoomba: rebuild on site soil

A 25-year-old field that became unplayable after moderate rain. We decompacted the red clay site soil, added drainage at 10 m centres and laser graded to a 1% fall to swale drains: five weeks of works plus a 10-week grow-in. See the Clive Berghofer field rebuild.

Genesis College, Bray Park: total rebuild in the holidays

A 25,000 m² reshape moving more than 7,000 m³ of soil, with new irrigation, drainage and Wintergreen couch, delivered within the eight-week summer school holidays. See the Genesis College total rebuild.

North Pine Christian College, Dakabin: rebuild with runoff harvesting

A new oval designed around the site’s Q100 flood level, with every grade and drain falling to the irrigation dam so runoff is recycled. It has laterals at 8.5 m centres and a 100 mm amended USGA sand rootzone at a 1.2% fall. See the North Pine Christian College project.

More school, club and council fields are in our recent projects.

Timing: the SEQ renovation window

Couch establishes fastest in warm soil, so in SEQ the main window is roughly September to January, after winter codes finish. On many school and council ovals that clashes with summer cricket, so the programme has to be agreed with the cricket users. Genesis College, which includes a cricket field, was rebuilt in the summer school holidays.

We only work the ground when it’s dry, so allow for storm delays, and book the assessment in autumn or winter.

What drives the cost

The main cost drivers are:

• field area, and whether training areas are included;
• lateral spacing, and whether sand slits are installed now or later;
• the volume of cut and fill needed to fix the falls;
• imported sand rootzone (Sheldon College and Bob Brock each took about 3,000 tonnes);
• new or modified irrigation, and where the drainage can legally outlet;
• turf supply, and the length of the grow-in maintenance period.

As a rebuild benchmark, the Queensland Government’s 2018 sport and recreation facility costs fact sheet put a natural grass soccer field (8,214 m²) at $434,000 and a rugby league or union field (10,400 m²) at $550,000. Those are indicative June 2018 figures for earthworks, drainage, irrigation and grass on a clean, flat SEQ site, so allow for cost increases since, and for sloping sites or poor soils. A renovation or slit drainage retrofit avoids most of the earthworks, although an extensive retrofit can approach rebuild cost. Either way, get a site-specific quote before you apply for grants.

Turf for the resurface

Most SEQ fields we build or renovate get Wintergreen couch from our Woodford farm: hard wearing and quick to recover. For sand profiles we supply turf grown on sand-based paddocks, as at Sheldon College. Clive Berghofer in cooler Toowoomba was turfed with kikuyu. Wintergreen is listed at $7.00/m², and field-scale supply and installation is quoted per project.

Natural turf vs synthetic field drainage

Many online answers about field drainage are really about synthetic pitches, which drain through a stone base under the carpet. Natural turf relies on falls, slits, pipes and an open rootzone. If you’re weighing up a switch, price a natural turf renovation alongside any synthetic quote.

Frequently asked questions

Book a field condition assessment

Not sure if your oval needs sand slits, a renovation or a rebuild? We grow the turf at Woodford and build the fields, so one team handles assessment, sand slit drainage, levelling and turf for sports fields across Brisbane and the Sunshine Coast. See our commercial and sports turf construction service, or request a quote and we’ll arrange a look at your field.

Key facts

What sports field construction covers

“Sports field construction” can mean three quite different jobs, and the price and timeline follow from which one you need:

• New build: a greenfield site in a new school, estate or council precinct, often handed over as a rough subgrade.
• Rebuild: strip, reshape, drain, irrigate and re-turf an old oval that is compacted, uneven and unplayable after rain.
• Renovation: keep the existing base and fix the playing surface.

This guide covers natural turf; we compare it with synthetic further down.

The process, step by step

This is the sequence we follow on our sports turf construction projects. The numbers come from our own completed jobs.

Earthworks and subgrade

Mistakes in the subgrade show up for years. At Genesis College in Bray Park, more than 7,000 m³ of soil was moved with machine-controlled dozers, then finished with a laser box blade. At the Les Hughes rugby league fields, also in Bray Park, a machine-control GPS dozer shaped the fields to design. At Samford a laser bucket took the subgrade to ±10 mm at a 1.4% fall, and gypsum was ripped into the clay. More on the soil side on our site and soil preparation page.

Drainage

Drainage keeps a field playable after an SEQ summer storm. The Metricon Stadium training field on the Gold Coast was designed for rainfall of up to 100 mm an hour, with laterals at 5 m centres feeding a ring main. At Bob Brock in Dakabin, pipe at 10 m centres was enough. At Sheldon College, gravel slit bands 500 mm apart connect the surface to the pipes.

Rootzone: sand profile or native soil?

High-spec fields sit on sand: 250 mm with a little peat at Samford and Narangba, 200 mm of amended local sand at Mackay. Sand drains fast and resists compaction but needs more water and fertiliser. At Clive Berghofer Stadium in Toowoomba, the client reused the red clay site soil, decompacted, amended and drained, as a deliberate cost saving.

Turf: paddock selection, slabs or big rolls

For a large job we set aside a paddock early and grow it for the end use. Council specs may require inspection for purity, weeds, density, pests and disease. Slabs harvest thinner than big rolls, which helps rooting, and can be laid at up to 10,000 m² a day against about 4,000 m² for rolls. Washed big rolls suit specs that allow no soil on the sand. Most of our fields use Wintergreen couch grown at Woodford; from a sand-based paddock it can match the profile without washing.

How long does it take?

Plan for two windows, not one: the build window (machines on site) and the grow-in window (turf establishing before play).

• Build window: 4 weeks at Sheldon College and on the Metricon drainage retrofit, 5 weeks at Clive Berghofer, and about two months at Narangba around wet weather.
• Grow-in: 6 weeks at Genesis College, 8 weeks at Bob Brock, 10 weeks at Sheldon and Clive Berghofer, 12 weeks at Samford and 13 weeks at Les Hughes.
• Weather: SEQ summer storms can stop earthworks and trenching for days. Build slack into the program.
• Season: couch grows strongly from spring to early autumn and slows in winter, so cool-season turfing means a longer grow-in.
• School holidays: the summer break suits a school oval but overlaps storm season, so have design and turf locked in before the gates close.

If grow-in time is the problem, turf can be pre-grown. For the 2018 Commonwealth Games, in partnership with HG Turf, we grew 25,000 m² of Wintergreen couch in HG’s hybrid turf system at Woodford over a 12-month grow-in, for the opening and closing ceremonies and Metricon Stadium’s main field.

What does a sports field cost in Queensland?

The Queensland Government publishes indicative facility costs for grant applicants. Its current Sport Facilities Costs sheet (prices at May 2026) no longer lists natural-grass football fields. The 2018 facility costs fact sheet did, at June 2018 prices:

Use them as a sense check, not a quote:

• They are June 2018 prices, excluding GST, on a clean, flat SEQ site. Costs have risen since. As an indication only, a natural-grass bowls green went from $169,000 (2018) to $427,800 (2026); the specification may differ between the sheets, so treat this as a signal, not a field escalation rate.
• Lighting, goals, fencing and accessories are excluded. The 2026 sheet puts new 100 lux LED lighting for a rugby or soccer field at $407,100.
• Sloping sites and poor soils are excluded, and sites outside SEQ carry a locality index (the 2026 sheet’s index is 117% for Mackay and 102% for Toowoomba and the Sunshine Coast).

The seven cost drivers

• Earthworks volume: Genesis College moved more than 7,000 m³.
• Drainage design: pipe spacing (5 m centres need twice the trench length of 10 m), slit bands and the length of run to an outlet.
• Rootzone: native soil versus thousands of tonnes of imported sand.
• Irrigation: reusing a working system (as at Bob Brock) or starting new.
• Turf specification: washed big rolls cost more than unwashed slabs.
• Access and timing: one gate, events during works or a compressed window.
• Testing and grow-in: hold points, compaction testing and maintenance length.

Ways to save without cutting corners

Reuse good site soil where tests support it, keep irrigation that still works, source rootzone sand locally (as at Mackay, which also makes matching top-dressing easy), specify unwashed slabs from a sand-based paddock where the profile allows, and book the turf paddock early.

Planning a field build or rebuild? Book a site assessment and we’ll walk the field, check the soil and drainage, and give you a realistic scope before you commit to a budget.

Natural turf vs synthetic for a school or club field: the 20-year cost view

On capital cost, natural turf is well ahead: in the 2018 figures above, synthetic soccer cost about 3.6 times as much. Over 20 years the gap narrows, because the costs fall differently:

• Natural turf: mowing, fertiliser, water, top-dressing, line marking, periodic renovation, and rest periods when use is heavy.
• Synthetic: the higher build cost, grooming, infill top-ups, and a carpet replacement within 20 years. Surface heat can also limit use on hot days.

The answer depends on weekly hours of use, so compare whole-of-life costs on the same basis.

Choosing turf for a Queensland sports field

• Couch is the usual choice on most SEQ fields. It wears hard, recovers fast and handles heat; most of our fields are Wintergreen. Compare the options on our turf varieties page.
• Kikuyu suits cooler inland sites. Clive Berghofer Stadium in Toowoomba, which swings from about 38°C to below freezing, switched from couch to kikuyu for year-round colour.
• Hybrid systems suit stadiums and elite venues with very high use.
• Turf wickets are a specialist job built with cricket clays. The outfield around them is usually couch.

After handover: looking after a new field

The first season decides how the field plays for years. Our grow-in programs have included mowing couch at about 30 mm, rolling, 10 mm sand top-dressings, keeping soil pH around 6 to 7, and core tests for root depth (Samford’s acceptance criterion was 200 mm). Top-dress with the same sand as the rootzone to avoid layering, rotate high-wear areas, and ask for a maintenance manual at handover.

Hancey’s sports field projects

n/a means the project page doesn’t record that figure. See more on our recent projects page.

How to brief a sports field contractor

A clear brief gets comparable quotes. Include:

• field size, sports and weekly hours of use
• the closure window and fixed reopening date
• funding status and any grant requirements
• existing survey, soil tests, outlets and irrigation
• renovation, rebuild or new build (or ask which)
• turf variety, washing and paddock inspection needs
• handover criteria: coverage, weeds, root depth, levels
• grow-in length and who waters during it

Frequently asked questions

Talk to the grower before you tender

We have grown turf at Woodford since 1994 and supply sports fields and commercial sites across Brisbane, the Sunshine Coast and beyond. If you’re scoping a field build, rebuild or renovation, read about our sports field construction service or book a site assessment to get a realistic scope, budget range and timeline. Prefer to talk it through? Call 1800 761 334 or use our contact page.