Use the drop-down menu from the SURVEYS tab to see photographs, illustrations and reports from each of the Discovering Derventio geophysical surveys. The project will run 90 days of survey between 2012 and 2015. Volunteers will use the dual fluxgate gradiometer system to carry out each survey with support from Grampus Heritage and Training Ltd. The survey results can help to locate roads, buildings, ditches, enclosures and industrial sites, helping us to reveal the extent of Roman Papcastle and informing our decisions on where to excavate. Click the ‘Get Involved’ tab to register your interest and join us in the field.