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(b) Make a contour map (draw on the map picture above) of piezometric head for the Lake using your data from the table above. Use a contour interval of 0.5 m. You will need about 8 contour lines. Note that the lake shoreline is a line of constant piezometric head, so contour lines near the lake should approximately follow the shoreline. Also remember that the water table tends to have a similar shape to the land surface. Wherever the ground slopes steeply around the Lake, it is also possibl that the water table slopes steeply (contour lines are closer together). Wherever th ground is flat around the Lake, it is also possible that the water table is relatively fla (contour lines are farther apart). Once you have finished contouring piezometric head, draw at least 2 arrows on your map showing the direction of groundwater flow (see the example below). Note that the arrows should be perpendicular to lin

(b) Make a contour map (draw on the map picture above) of piezometric head for the Lake using your data from the table above. Use a contour interval of 0.5 m. You will need about 8 contour lines. Note that the lake shoreline is a line of constant piezometric head, so contour lines near the lake should approximately follow the shoreline. Also remember that the water table tends to have a similar shape to the land surface. Wherever the ground slopes steeply around the Lake, it is also possibl that the water table slopes steeply (contour lines are closer together). Wherever th ground is flat around the Lake, it is also possible that the water table is relatively fla (contour lines are farther apart). Once you have finished contouring piezometric head, draw at least 2 arrows on your map showing the direction of groundwater flow (see the example below). Note that the arrows should be perpendicular to lin

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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1234567 8 9 10 to the third decimal place. Piezometer ID Northing (m) Easting (m) Lake 4429505.78 328093.03 223.338 4429438.68 328147.91 223.546 4429531.07 328114.27 226.444 4429498.80 328051.49 223.374 4429496.60 328012.32 224.103 4429481.82 327986.50 224.795 4429407.76 328182.03 223.483 4429454.67 328067.67 224.562 4429470.03 328200.88 225.169 4429498.26 328139.90 223.679 Elevation, Ztop Depth to (m) 4429504.85 328074.88 water, d (m) 0.928 1.375 4.132 1.29 3.83 5.872 1.18 3.122 2.83 1.365 Depth to water (m) Piezometric head, H (m) H=Ztop-d 0.980 10 22.41 22.171 DC ZT For the lake, the piezometric head is essentially the same as the elevation of the water surface in the lake. To calculate piezometric head in the lake, measure down from the center point on the stone overlook on the north side of the lake (from top of stone pavers to lake water), and then minus the depth to water. Northing (m) Easting (m) Elevation of top of stone pavers (m) 223.629 312 JOH 1220.272 1218.923 1222, 30² 221.44 12272.339 1222.314 Piezometric head in the lake, H (m) 222.69
Transcribed Image Text:1234567 8 9 10 to the third decimal place. Piezometer ID Northing (m) Easting (m) Lake 4429505.78 328093.03 223.338 4429438.68 328147.91 223.546 4429531.07 328114.27 226.444 4429498.80 328051.49 223.374 4429496.60 328012.32 224.103 4429481.82 327986.50 224.795 4429407.76 328182.03 223.483 4429454.67 328067.67 224.562 4429470.03 328200.88 225.169 4429498.26 328139.90 223.679 Elevation, Ztop Depth to (m) 4429504.85 328074.88 water, d (m) 0.928 1.375 4.132 1.29 3.83 5.872 1.18 3.122 2.83 1.365 Depth to water (m) Piezometric head, H (m) H=Ztop-d 0.980 10 22.41 22.171 DC ZT For the lake, the piezometric head is essentially the same as the elevation of the water surface in the lake. To calculate piezometric head in the lake, measure down from the center point on the stone overlook on the north side of the lake (from top of stone pavers to lake water), and then minus the depth to water. Northing (m) Easting (m) Elevation of top of stone pavers (m) 223.629 312 JOH 1220.272 1218.923 1222, 30² 221.44 12272.339 1222.314 Piezometric head in the lake, H (m) 222.69
(b) Make a contour map (draw on the map picture above) of piezometric head for the Lake using your data from the table above. Use a contour interval of 0.5 m. You will need about 8 contour lines. Note that the lake shoreline is a line of constant piezometric head, so contour lines near the lake should approximately follow the shoreline. Also remember that the water table tends to have a similar shape to the land surface. Wherever the ground slopes steeply around the Lake, it is also possible that the water table slopes steeply (contour lines are closer together). Wherever the ground is flat around the Lake, it is also possible that the water table is relatively flat (contour lines are farther apart). Once you have finished contouring piezometric head, draw at least 2 arrows on your map showing the direction of groundwater flow (see the example below). Note that the arrows should be perpendicular to lines of constant piezometric c head, and the direction of flow should be from high to low. 27°57'45" 30" 15" 27°57′ ● 105.78 81°35'45" 71 (B) 5/29/97= low • 106.39 102-- 106.85 108.24 -108- -107- 05.05 1 106- 104.63 >> 104.17 104,16 30" 105.78 105- 104,86 104.41 04.02 103.58 104 15" T Lake Starr 103.98 102/64 103.83 1 104.10 103.81X 102,08 102.21 81°35′ J 104.98 103.59 -103- +102. 101.04 (e) 103.85 0 0 103.95 104.65 104.08 102.38 81°34'45" T 101.74 750 200 103.37 1500 FEET 400 METERS EXPLANATION LINE OF EQUAL WATER-TABLE ALTITUDE-- In feet above sea level. Contour interval 1 foot. Dashed where approximate WATER-TABLE ALTITUDE- In feet above sea level, (e) estimated value Ground-water flow direction 2DESHA 20.B0AESTA
Transcribed Image Text:(b) Make a contour map (draw on the map picture above) of piezometric head for the Lake using your data from the table above. Use a contour interval of 0.5 m. You will need about 8 contour lines. Note that the lake shoreline is a line of constant piezometric head, so contour lines near the lake should approximately follow the shoreline. Also remember that the water table tends to have a similar shape to the land surface. Wherever the ground slopes steeply around the Lake, it is also possible that the water table slopes steeply (contour lines are closer together). Wherever the ground is flat around the Lake, it is also possible that the water table is relatively flat (contour lines are farther apart). Once you have finished contouring piezometric head, draw at least 2 arrows on your map showing the direction of groundwater flow (see the example below). Note that the arrows should be perpendicular to lines of constant piezometric c head, and the direction of flow should be from high to low. 27°57'45" 30" 15" 27°57′ ● 105.78 81°35'45" 71 (B) 5/29/97= low • 106.39 102-- 106.85 108.24 -108- -107- 05.05 1 106- 104.63 >> 104.17 104,16 30" 105.78 105- 104,86 104.41 04.02 103.58 104 15" T Lake Starr 103.98 102/64 103.83 1 104.10 103.81X 102,08 102.21 81°35′ J 104.98 103.59 -103- +102. 101.04 (e) 103.85 0 0 103.95 104.65 104.08 102.38 81°34'45" T 101.74 750 200 103.37 1500 FEET 400 METERS EXPLANATION LINE OF EQUAL WATER-TABLE ALTITUDE-- In feet above sea level. Contour interval 1 foot. Dashed where approximate WATER-TABLE ALTITUDE- In feet above sea level, (e) estimated value Ground-water flow direction 2DESHA 20.B0AESTA
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