Pumping Tests: Lower Thames Crossing
- Client: Perfect Circle
- Location: Gravesend, Kent
- Duration: April 2019 – August 2019
Project Overview
As part of the site investigation phase of Lower Thames Crossing. Stuart Wells undertook a large scale Pumping Tests for Perfect Circle/Highways England.
The Objectives of the Pumping Tests
- Two pumping tests were undertaken in accordance with BS ISO 14686:2003 to determine localised hydrogeological characteristics of the Seaford Chalk formation to support the development of the Lower Thames Crossing preliminary design.
- The testing also provided the necessary hydrogeological data required to support applications for the necessary Environmental Permits for groundwater abstraction and discharge.
Pumping Test - Scope of Works
- All temporary works requirements including welfare and track matting.
- Drilling and installation and development of all chalk abstraction, recharge and monitoring wells.
- In-situ hydraulic testing.
- Provision and installation of pump testing equipment (including generator power supply), data logger monitoring of observational wells, water sampling and analysis, as well as factual reporting of the results obtained.
- Downhole level loggers & VW piezometer were utilised to measure groundwater levels.
- MAG flowmeters with dataloggers recorded abstraction flow.
- We undertook groundwater sampling and analysis together with field parameter water quality data throughout the test period.
- Pumping Tests in accordance with BS ISO 14686:2003.
- Surface water level monitoring.
