Ahuman case history the following exercise is developed from an actual case history involving a housing development near grand forks, nd. (review figure 17.3 in tarbuck and lutgens to do this activity.) figure 8.2 is a map showing water level readings (in meters above sea level) obtained in wells distributed throughout the housing development. these water levels are referred to as "head", and indicate the height of the water table at each well location. 252.6 25404 53.56 253.17 253.10 252.97 o 252.48 252 95 e 252.81 25262 252.87 scale 162 100 meters 252.8 figure 8.2. well locations and head values in housing development a. convert this diagram to a map of the water table by drawing in contour lines of the head values. use a contour interval of 0.2 meters. (a groundwater "mound" has been drawn on the answer page to explain the nw part of the map, but the rest of the map has been left for you.) b. indicate direction of groundwater flow by adding flowlines perpendicular to the water table contours. figure 8.3 is sketch of the same area, at the same scale, to show the locations of a few of the homes. you may transfer these home locations to your map if you desire. the rate of groundwater flow through the ground was determined for each well location. this was done by physically bailing water from each well and determining the time it took for water recovery back to the original level. some of these flow rates in the vicinity of different residential properties are shown in the diagram. sediments brought up during boring for well placement varied between well locations, and ranged from clay to sand c. the ground surface elevation averages 254.5 meters above sea level within this flat- terrain housing development. nearly all the homes have basements that reach 2.44 meters below ground. provided on the answer page are profile views of the basements of houses a, b, and c. calculate water levels that would be present in those basements if sump pumps did not pump the water out. show those water levels accurately in each basement