Stakes are placed every 20m (horizontally) on a straight section, and
every 10m on a curved section (a bend).
Once the first stake has been placed at the initial platform level, take the
corresponding reading and put the next stakes in place consecutively,
taking respective readings according to the distance and the canal
design slope.
Figure 19 shows the outline of the platform. Here the slope gradient is 2
per thousand.
1 = the stake in the initial platform level and the first reading is 2.30m,
4 = the stake with the last reading from station I (2.42m) and the first
reading from station II (2.20m). This stake is called the changing point
The readings are noted in sequence from each point of the level station,
as shown in table 1.
Layout of the platform, MHPP canal
Slope gradient: 2 per thousand
Date: 02.01.92.
I, II… = level stations
Fig. 19
1 = 1st stake
4 = stake with the last reading from the 1st station, also called changing point
Stake No. Horizontal
distance
01 0+00
02
03
04
Change
0+20
0+40
0+60
--
TABLE 1
Reading
Observations
to be
noted
2.30 Initial reading at
initial level
2.34 Correct reading
2.38 Correct reading
2.42 Correct reading
2.20 Reading from the
stake at the
20