MOD-12_Groundwater Lab 2023
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Northern Virginia Community College *
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Geography
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Feb 20, 2024
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docx
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Module 12 Part 2 Groundwater Lab
Name: Brooke Bradshaw By adding your name, you are acknowledging that the work presented is your own.
Objective:
This lab will familiarize you with the basic techniques in understanding underground contaminant flow.
Introduction:
In this lab, you will be asked to plot the groundwater elevation data provided in Table 1 on the map of Clearwater Lake provided (Figure 1). You will then create contour lines showing the elevations of the local groundwater table. You will draw groundwater flow arrows indicating the direction of flow of the subsurface groundwater. Based on this map, you will predict the direction of contaminant flow in the subsurface groundwater.
Directions:
1)
Read section 17.2 Groundwater and the Water Table
in your textbook. Pay particular attention to Figure 17.7 Mapping the Water Table.
2)
Plot the elevations of the water table (provided in Table 1) on the map of Clearwater Lake (Figure 1)
3)
Contour the groundwater table in 5 ft. contours. Estimate the location of each 5 ft elevation (for example, 120 ft. 125 ft, 130 ft, etc…) similar to the example below, left. 4)
Draw in your groundwater flow lines keeping in mind that water always flows from an area of higher elevation to an area of lower elevation. See the example, below, right.
Contouring groundwater elevation data (example)
Adding groundwater flow lines
Table 1
Well
ID
Elevation of water
table (ft)
Contaminant
W1
118
none
W2
124
none
W3
114
none
W4
120
none
W5
123
none
W6
127
none
W7
107
none
W8
116
none
W9
120
none
W10
126
none
W11
132
none
W12
131
none
W13
125
none
W14
123
none
W15
119
ARSENIC
W16
115
none
W17
126
none
W18
122
none
Questions to answer once you finish the map on the following page:
Will the arsenic in well W15 likely contaminate the water in Clearwater Lake? Why or why not?
It’s unlikely that well W15 will contaminate the water in Clearwater Lake because the well is approximately north-east of the lake and the water flows in that direction, this is because the elevation is lowering in that direction.
In which direction is the contaminated water in well W15 moving? Which well will most likely show contamination of arsenic next?
The contaminated water in well W15 is moving approximately north-east which will most likely bring the
contamination to W16.
Figure 1: Map of Clearwater Lake
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