Page 30 - soil-plant-water relationship and water requirement

SOIL-PLANT-WATER RELATIONSHIP AND WATER REQUIREMENT

5. The following data were obtained from the infiltration experiment for basin irrigation
system design.

Time,t (min) 10 20 30 60 120 180
Infiltration,i (cm) 1.0 1.6 2.1 3.4 5.4 7.2

i. Plot the graph of log i versus log t.
α
ii. Get the equation of i =ct
iii. Determine the time needed for 50mm of irrigation depth and calculate the
depth of infiltration after 4.0 hours.

6. The following graph is obtained from the experiments of 'double ring infiltrometer',
based on the graph below, determine:

i. Infiltration equation in form of i  Ct
(by plotting a straight line graph)

ii. Required infiltration time for suppling 125 mm of water depth
and infiltration rate at that time.

Infiltration,mm

12
0
10
0
80

60

40

20

0
30 60 90 12 15 18 21 Time,min
0 0 00 00 00 00

21