Shepparton sits on deep Quaternary alluvial deposits from the Goulburn River system, with sandy loams overlying clay layers and occasional gravel beds. These conditions often hide buried pipes, old foundations, or shallow groundwater paths that surface surveys miss. A Ground Penetrating Radar (GPR) survey provides rapid non-invasive imaging of the subsurface, mapping anomalies down to several meters without drilling. We combine this with a calicatas exploratorias to correlate radar reflections with soil profiles, and with ensayo CPT when continuous penetration data is needed for soft layers. This layered approach is standard for infrastructure projects in the region.
GPR survey in Shepparton detects buried utilities, voids, and old foundations without excavation — critical for safe excavation and foundation design in alluvial soils.
Method and coverage
Regional considerations
The Goulburn River floodplain means shallow groundwater is common in Shepparton, often at 2–4 m depth. Clay-rich layers attenuate radar signals, reducing depth penetration and masking deeper targets. Without a calibrated GPR survey, a contractor might hit an uncharted stormwater pipe or a buried concrete slab during excavation. That stops work, costs time, and can damage equipment. Our survey accounts for local soil conductivity and moisture content, adjusting antenna frequency and gain settings to maximize signal return. We also perform grid surveys over critical zones — like near heritage buildings or along proposed trench alignments — to map every anomaly before breaking ground.
Standards that apply
AS 1726:2017 Geotechnical Site Investigations, AS 4678:2002 Earth-Retaining Structures, AS 1289.7.3 Standard Guide for Using the Surface GPR Method, AS/NZS 1170.0:2002 Structural Design Actions
Complementary services
Utility Mapping
Locate metallic and non-metallic pipes, conduits, cables, and tanks. We mark positions on ground surface and deliver georeferenced CAD plans. Ideal for pre-excavation clearance on roads, subdivisions, and industrial sites.
Void & Cavity Detection
Identify subsurface voids, sinkholes, and poorly compacted fill. Common in older industrial areas of Shepparton where backfilled pits or underground storage tanks may have collapsed. Data is presented as depth slices and isosurface models.
Concrete & Pavement Scanning
Scan reinforced concrete slabs, bridge decks, and pavements to map rebar spacing, post-tensioning ducts, and delamination. We use high-frequency 1.6–2.6 GHz antennas for near-surface resolution down to 2 cm.
Typical parameters
Top questions
How deep can GPR penetrate in typical Shepparton soils?
In dry sandy soils common in the Goulburn Valley, depth reaches up to 8 m with a 250 MHz antenna. In clay-rich layers, which are more conductive, penetration typically drops to 2–4 m. We select the antenna frequency based on target depth and local soil conductivity.
What is the cost of a GPR survey in Shepparton?
The cost depends on site area, access conditions, and required resolution. For a typical 500 m2 utility survey with 250 MHz antenna, expect between AU$1,680 and AU$14,690. Contact us for a project-specific quote.
Can GPR detect plastic pipes or concrete drains?
Yes, GPR detects both metallic and non-metallic objects. Plastic pipes and concrete drains produce clear reflections when there is a contrast in dielectric permittivity with the surrounding soil. Wet clay around a dry plastic pipe gives a strong signal. We also cross-reference with ground-truthing from test pits when needed.