y = ·0891 x ·86.

Where y is the depth of water absorbed in feet and x is the time in hours. The observations extended over eight days. Denoting by c the depth of water in feet absorbed in one hour, it was found that on a field on which no rain had fallen for two months, c was ·04 to ·05 but on the second watering of the crop about a month later c was ·02 to ·03 and about the same on a third watering. It was found that at the first commencement the rate of absorption was much affected by the state of the surface of the ground but that the effect was only temporary. The losses were found to be as follows:

Day.Loss per Day.Loss per Hour.
(c)
Feet.Feet.
1st 1·36 ·057
2nd1·13 ·047
3rd1·07 ·046
4th1·02 ·043
5th ·96 ·041
6th ·90 ·037
7th ·80 ·033
8th ·77 ·032
Total8·01

In the eight days the total loss was almost exactly eight feet.

The losses by absorption in the various channels of certain canals has been estimated to be as follows:—

Channel.Nature
of soil.		Mean
depth of
water in
Channel.		Value
of (c)		Loss
per Million
square feet
of
wetted surface.		Remarks.
Feet. c. ft. per sec.
Main LineUpper Bari Doab CanalShingle and Sandy Soil6·035 9·7 -Fairly reliable estimates based on discharge observations.
„„ Sirhind CanalSandy Soil7 9·0
BranchesUpper Bari Doab CanalLoam ·00792·2
„Sirhind CanalSandy Soil 5·2
DistributariesUpper Bari Doab CanalLoam ·012[4]2·3 to 4·4
(average 3·3)		 -Somewhat rough estimates.
„Sirhind CanalSandy Soil 5 to 12
(average 8·0)
WatercoursesUpper Bari Doab CanalLoam ·015
to
·045		[4]

[5]		3·3 to 20
(average 9·4)
„Sirhind CanalSandy Soil 7 to 60
(average 22)

[4] When the channel was in continuous flow.

[5] Maximum value when flow was intermittent.

Some information as to losses of water is also given in [Chapter IV. Art. 2].

The relative losses of water in the channels of the Upper Bari Doab Canal were as follows:—