Understanding ground water levels and their meaning for recharge, groundwater flow and contamination
STATS, St. Albans
Type of course in situ
Course provider First Steps Ltd
Available dates for this course
Please contact First Steps Ltd directly for a current list of course dates
ONE DAY COURSE FOR EARTH SCIENTISTS, GEOTECHNICAL & GEOENVIRONMENTAL ENGINEERS
This one-day course will consider water levels of all sorts, measured whilst drilling, either as seepages or as rising or falling levels, measured in standpipes and piezometers, measured in open and cased holes as sub-artesian or artesian standing levels, or whether naturally issuing from the ground as springs and along spring lines. Each will be demonstrated with the aid of a desk top exercise involving the plotting of water levels with respect to their correct elevation, using real data and borehole logs to determine the relation between these water levels and their associated geology and river hydrology. These exercises will enable the fragmentary data provided by water levels to become the basis for decisions concerning recharge from infiltration and groundwater flow to and from valleys, and along and across faults. The rate and duration of water level movement and their implications for permeability and storage will also be considered. Opportunities will also be provided for incorporating such data into sketches of 3D situations to support applications for the need for remediation to the Environment Agency.
WHO SHOULD ATTEND
The nature of the exercises will enable earth scientists and geologists as well as civil and environmental engineers to gain a practical working knowledge of the subject taught. Attendees may bring with them an overhead projection of a BH log or other water level data they have encountered as a problem at work, for discussion at 16.30.
09.00 – 09.30 Registration
09.30 – 10.30 Concepts of head (elevation, pressure and velocity) and calculation of water pressure, and calculation of flow direction seen in plan
10.30 – 11.00 Exercises using head measured in standpipes and piezometers for calculation of pressures and flow directions
11.00 – 11.15 Tea and Coffee
11.15 – 12.15 Water strikes, rising and falling levels, artesian and sub-artesian levels
12.15 – 13.00 Exercises with water level movements and relation to rates of flow
13.00 – 14.00 Lunch
14.00 – 15.00 Cross sections involving ground water levels; deductions concerning aquifers and aquitards, calculation of vertical and horizontal hydraulic gradients and of vertical effective stress.
15.00 – 15.30 Exercise in drawing a cross section with geological and hydrogeological data and deduction of directions of flow.
15.30 – 15.45 Tea and Coffee
15.45 – 16.30 Evidence for steady and non-steady flow and implications for calculations of same, including that for the flow net (i.e. potential difference) solution.
16.30 – 17.00 Rounding off and consideration of problems brought by attendees.
Dr. Michael de Freitas: First Steps Ltd. CGeol
Unit 17 Hurlingham Studios
Telephone: 0207 736 6889