Module 4, flow

Question 1

Phreatic zone

Answer 1

zone of soil below ground water table (fully saturated)

Question 2

aquiclude

Answer 2

imperiable stratum

Question 3

aquitard

Answer 3

almost impermeable

Question 4

aquifer

Answer 4

stratum capable of transporting large amounst of water

Question 5

what lab testing do we do for course soils to find k

Answer 5

constant head parmeater

Question 6

what lab testing for fine soil k

Answer 6

falling head parameter

Question 7

potential problems for lab testing

Answer 7

bad for inhomogenous soil (not reresentive of whole soil)
fine particle lost before testing
soil structure disturbed

Question 8

assumptions for confined well pumping

Answer 8

• GWL does not draw into aquifer
• well penetrates to bottom of aquifer
• flow is horizontal

Question 9

unconfined well pumping assumptions

Answer 9

still assume flow is horizontal

flow thickness is reduced towrads well

Question 10

flow net constrcution steps

Answer 10

draw structure
identify impermeable and permeable boundaries
use symmetry
sketch
make sure square