Due to the width reduction of the river at Southease Bridge and SE Lewes, an alternative method to the boat used the day before at Newhaven harbour was devised. The ADCP was attached to the back of an inflatable dingy, which for safety reasons, did not carry a person whilst collecting transect data. Instead, ropes and winches were used to pull the boat from one bank to the other and the laptop computer was operated only when the boat was back safely on one bank.

To allay safety concerns, both the rope and dingy surveys were carried out next to bridges, where passing vessels would be required to lower their masts. The ropes and winches were attached to meter high metal frames and these were placed on the tops of the artificial levees (river banks). This ensured that they were the same height as the bridge. In addition, warning signs of the survey were placed on the banks both up and down stream.

The ADCP, together with other equipment, produced a large amount of data over these 3 days. This is currently being processed to give us, over the tidal cycle:

• Suspended sediment concentrations (acoustically produced)
• Suspended sediment concentrations (optically produced using a t ransmissometer)
• Suspend sediment concentrations (directly produced through sampling and filtering)
• Grain size analysis (directly produced through sampling and filtering)
• Direction and speed (velocity) of flow
• Discharge
• Conductivity (indication of salinity)
• Temperature
• Bathymetry
• Depth