Length of soil for constant head permeability is 30 cm,area of specimen is 177 cm^2 ,constant head difference is 50 cm,total volume of water collected in 5 minutes is 350 cm^3 calculate the hydraulic conductivity of soil
Answers
Answer:
5.1 Introduction
Soils are permeable due to the existence voids through which water can flow
from points of high energy to points of low energy. The study of the flow of
water through permeable soil media is important in soil mechanics.
Hydraulic Gradient
When water flows through a saturated soil mass, there is a certain resistance
to the flow because of the presence of solid matter. However, the laws of fluid
mechanics which are applicable for the flow of fluids through pipes are also
applicable to flow of water through soils. As per Bernoulli's equation, the total
head at any point in water under steady flow condition may be expressed as:
Total head = pressure head + velocity head + elevation headWhere ht = total head,
u = pore water pressure, and w = unit weight of water, the term = hp, (m)
= velocity, g = acceleration due to gravity, this value is very small = 0
Z = elevation head, (m) = he
ht = hp + he
Elevation head (he): is the vertical distance
from a datum line to the point considered
(above or below a datum plane).
Pressure head (hp): is the height of the
vertical column of water in the piezometer
installed at that point.
Piezometer: is a device used to measure
liquid pressure in a system by measuring
the height to which a column of the liquid
rises against gravity, or a device which
measures the pressure of groundwater at
a specific point.
Total head (ht) = elevation head + pressure
I thik this may help you......
Answer:
3.95x10^3 cm/sec
Explanation:
k=Ql/Aht