22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

A Versatile Multi-Port System for High Resolution Groundwater Monitoring in Rock and Overburden

23 Sep 2019, 15:00
15m
Auditorium 2 ()

Auditorium 2

Oral Topic 5 - Tools, methods and models to study groundwater Parallel

Speaker

Prof. John Cherry (G360 Institute for Groundwater Research - University of Guelph)

Description

Characterization and monitoring of groundwater using boreholes is most effectively and efficiently done when each hole is equipped to measure hydraulic head and water samples can be collected at many depths, with each depth interval sealed off from groundwater above and below to minimize short-circuiting in the natural flow system. Multi depth installations in single boreholes are done using nested wells (several conventional wells: each with a screen) or using assembled multi port systems (MPSs). This presentation concerns a new design of MPS referred to as the G360 MPS, which is a major redesign of that described by Cherry and Johnson, 1982. Although many MPS are reported in the literature, only a few are commercially available beginning with the Westbay system in the late 1970’s, but MPS are generally underused by the groundwater profession. The G360 MPS has versatility in several borehole diameters in both bedrock and overburden. It is modular in design with ports attached to casing lengths of standard Schedule 80 PVC casing (2,2.5,3,4-inch ID). A polytube (e.g. polyethylene, nylon, HDPE, Teflon) attached to each hole port extends to surface to form a standpipe well internal to the PVC casing. The number of ports (wells) depends on the inside diameter of PVC casing and the outside diameter of the tubes. More than 18 G360 MPS have been installed to depths up to 150 m in four different hydrogeologic settings, including bedrock and overburden, with number of ports between 8 and 18 and tubing inside diameters between ⅝ to ¾ inches. The components are standard PVC pipe machined and small off-the-shelf parts for local manufacturing, simple assembly and installation. In overburden holes, sand is emplaced around the ports and bentonite forms the seals. In bedrock, the systems have light-weight rubber packers, either removable or permanent. With its simple manufacturing using readily available materials and installation in many-sized boreholes, the G360 MPS is aimed at global use. During the 6 years since the first installation, much progress has been made in demonstrating the performance of the G360 MLS using various drilling methods,borehole diameters and port configurations. Performance in karst, maximum depth capability (likely 200-300m) and alternative packer seal materials remain to be tested.

Primary authors

Beth Parker (G360 Institute for Groundwater Research, College of Engineering & Physical Sciences, University of Guelph) Prof. John Cherry (G360 Institute for Groundwater Research - University of Guelph)

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