is functioning well to prevent the water from flowing out of the area, even in the peak
of dry season (in September 2018). The decreasing GWL was up to 62.8 cm below
the surface. The highest GWL occurred in December 2018 of approximately 20 cm
above the surface (Fig. 21.9).
-120
-100
-80
-60
-40
-20
0
20
40
0
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
)
m
c
(
l
e
v
e
l
r
e
t
a
W
Point of observaƟon
Ground water level at 350 m from the canal blocking
(Km. 28)
18-Jul-18
30-Jul-18
15 Agust 2018
26-Sep-18
25-Okt-18
26-Nov-18
28 Des 18
-80
-60
-40
-20
0
20
0
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
)
m
c
(
l
e
v
e
l
r
e
t
a
W
Point of observaƟon
Ground water level at 750 m from canal blocking (Km. 28)
18-Jul-18
30-Jul-18
15 Agust 2018
26-Sep-18
25 Okt 2018
26-Nov-18
28 Des 18
a
b
Fig. 21.8 The water level condition at the third location of the canal blocking establishment. (a)
Inside; (b) outside the canal blocking
604
T. W. Yuwati et al.