What excavator do I need for drainage work in NSW?

## Excavator Hire for Drainage Work in NSW Poor drainage is one of the most common problems in Sydney residential properties — particularly in Western Sydney's clay-heavy soils and on sloping sites across the Hills District, North Shore, and Northern Beaches. A mini excavator makes drainage installation fast, accurate, and significantly cheaper than manual excavation. ### Types of Drainage Work and Machine Requirements **Stormwater drainage (pipes, pits, kerb connections):** - Typical trench: 300–500mm wide, 600–900mm deep - Recommended machine: 1.7T mini excavator - The 1.7T's 450mm bucket is ideal for standard stormwater trench widths **Ag-pipe / French drain (subsoil drainage):** - Typical trench: 300–400mm wide, 600–800mm deep - Recommended machine: 1T mini excavator - The 1T is compact enough for most residential gardens **Surface drainage (swales, channels):** - Requires reshaping of surface levels rather than deep trenching - Recommended machine: 1.7T or 3.5T depending on area - The 3.5T is more productive for large areas of surface reshaping **Retention/detention basins:** - Larger excavation volumes - Recommended machine: 3.5T or 5.5T - Contact BuildHire for advice on machine selection for basin construction ### Drainage Planning Before You Hire Before hiring an excavator for drainage work, ensure you have: 1. **A drainage plan:** Know where your pipes will run, what grade they need (minimum 1:100 for stormwater), and where they will discharge. A hydraulic engineer or plumber can prepare this. 2. **Council approval (if required):** Stormwater connections to council infrastructure require council approval in most NSW councils. Check with your local council before starting work. 3. **Dial Before You Dig:** Call 1100 before any trenching. Drainage trenches often run parallel to existing services. 4. **Materials on site:** Have your pipes, fittings, pits, and bedding material (coarse sand or gravel) on site before the excavator arrives. This maximises productive hire time. ### Drainage in Sydney's Clay Soils Western Sydney's heavy clay soils are particularly prone to drainage problems — clay doesn't drain, it holds water. Ag-pipe systems in clay must be installed with adequate gravel surround (minimum 100mm of clean gravel around the pipe) to function effectively. In clay soils, the 1.7T mini excavator is more efficient than the 1T — clay is harder to cut and heavier to move. Budget for 20–30% more hire time in clay compared to sandy soils. ### Combining Drainage with Other Excavation Work Many BuildHire customers combine drainage installation with other excavation work — pool excavation, footing work, or landscaping — using the same machine for the full day. Plan your work sequence to maximise the value of your hire.