Problem 9.1. The figure below shows information from monitoring wells sampling from subsurface confined and unconfined aquifers. Land surface Wells Aquitard, confining layer These wells are only open to the aquifer below the confining layer Water level Draw a cross section of the subsurface water system (i.e., everything below ground level) where you label the following: a) Water table (i.e. piezometric surface of the unconfined aquifer) b) Vadose (unsaturated) zone c) Unconfined aquifer

Problem 9.1. The figure below shows information from monitoring wells sampling from subsurface confined and unconfined aquifers. Land surface Wells Aquitard, confining layer These wells are only open to the aquifer below the confining layer Water level Draw a cross section of the subsurface water system (i.e., everything below ground level) where you label the following: a) Water table (i.e. piezometric surface of the unconfined aquifer) b) Vadose (unsaturated) zone c) Unconfined aquifer

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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Question 5 A well pumping at 2180.4 m³/d has observation wells located 3, 12, 46, 91, and 122m away. After 0.14 day of pumping, the following drawdowns were observed: Distance (m) Drawdown (m) 4.60 3 12 2.87 46 1.34 91 0.52 122 0.08 data on semi-log scaie usiny ivATLAD, Determine transmissivity (T) in m?/d, hydraulic conductivity (K) storage coefficient (S) m/d, and the
Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min
The direction of groundwater flow and general direction groundwater may carry contamination cannot be determined using two wells (two groundwater level or piezometric surface measurements). Why? One of the following option is correct. a) Darcy's law requires more than two points. b) Groundwater energy surface is in 2-D. The characteristics of a 2-D surface must be defined by more than 2 points (at least 3). c) Since one well will show higher energy than another, a third well is needed to confirm that the flow direction is between the two wells. d) The premise of the question is not correct. The energy gradient can be estimated from two points and flow direction can be estimated as long as the distance between the two points is known. Fick's law requires more than two points
9) A well is located in a confined aquifer near the intersection of a constant head and impervious boundary. a) Estimate the steady state drawdown in the well for Q=2 ft³ s, rw = 1 ft, distance from the well to stream= 300ft and distance from well to impervious boundary= 150 ft. T = 0.14ft²/s b) Estimate the steady state drawdown at point P located midway between the well and the steam. The angle between the stream and the impervious boundary is 90°
Hello Wondering if you could help me answer the following question? Thank you A fully penetrating pumping well extracts groundwater from a confined aquifer with a pumping rate of 750 m3/day. The hydraulic conductivity of the aquifer is 10 m/day and the saturated thickness is 50 m. The drawdown of the aquifer from this pumping well is insignificant at a distance of 1000 m from the pumping well. At what distance from the pumping well is the drawdown 10 cm? Assume the hydraulic gradient is negligible in the local area. Transmissivity T = 1746.76 gal/min/ft Hydraulic conductivity = 11.645 gal/min/ft2 Storativity = 0.809 The drawdown on Jenny’s Well by the end of August. =0.6902 ft. Observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. The data for time (t) and drawdown (s) is given below: t (min) s (ft) 0.072 0.003 0.105 0.006…
Please explain in detail (include references if needed): How is the coefficient of permeability (k) important in UNCONFINED AQUIFER, specifically, what does it imply if you got a high or low value of k? What are the important factors to consider?
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(b) Water is to be pumped from a well. Two observations well were constructed to observe the head and drawdown of the groundwater. Calculate the steady flow pumping required for the well to maintain the head (hı and h2) as shown in Figure Q5. Ground surface Pumping well h2 = 90.6m h, = 85.3 m %3D Confining Layer , = 30m Confined depth = 40 m r2 = 100m Confined aquifer Bedrock Figure Q5: Location of observation wells and pumping well in confined aquifer
A well is pumping at an unknown, steady rate in a confined aquifer. Near the pumping well are two observation wells; observation well A is located 8m from the pumping well and B is located 24m from the pump- ing well. The heads in these wells are hA = 134.20 and hB = 134.28 m. You know from prior pumping tests of the well that the well and the observation wells are screened in a confined aquifer with transmissivity T = 1200 m2/day. Assuming that without the well pumping there would be no hydraulic gradient at all, what is the pumping rate of the well?
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Relationship of Fr with water saturation 1. How important is the saturation exponent factor n? 2. What influences the magnitude? 3. Mention several methods to find these quantities and include references!
Name the two types of groundwater aquifers. Describe how they differ. What type of aquifer generally occurs closest to the land surface (i.e. is shallowest in the subsurface)? In an unconfined aquifer, what physical boundary does the piezometric surface correspond to?