Problems
145
of the saturated conductivity and the conductivity at the wetting front
(the geometric mean of two numbers is the square root of the product
of the numbers). Assume that the potential at the infiltration boundary
is zero.
c. If 100 mm of rain falls on this soil in two hours, estimate the runoff if
the initial volumetric water content of the soil is 0.1 m
3 m-3.
d. What is the depth of wetting for each rainfall case above?
e. Estimate the new average water content for the top 100 cm of soil after
each of the above rainfalls.
9.2. If E,,, is measured to be 5 mm d-' in the sandy loam soil of
problem 9.1 immediately after a rain that wets the upper 0.1 m of a
root zone to a uniform water content of 0.25 m
3 mP3, how long will
it take before the transpiration decreases to 2.5 mm d-I because of
water depletion in the top 0.1 m root zone? Assume that no water is
available below the depth of wetting from the rain.
145
of the saturated conductivity and the conductivity at the wetting front
(the geometric mean of two numbers is the square root of the product
of the numbers). Assume that the potential at the infiltration boundary
is zero.
c. If 100 mm of rain falls on this soil in two hours, estimate the runoff if
the initial volumetric water content of the soil is 0.1 m
3 m-3.
d. What is the depth of wetting for each rainfall case above?
e. Estimate the new average water content for the top 100 cm of soil after
each of the above rainfalls.
9.2. If E,,, is measured to be 5 mm d-' in the sandy loam soil of
problem 9.1 immediately after a rain that wets the upper 0.1 m of a
root zone to a uniform water content of 0.25 m
3 mP3, how long will
it take before the transpiration decreases to 2.5 mm d-I because of
water depletion in the top 0.1 m root zone? Assume that no water is
available below the depth of wetting from the rain.