BWT P-PSC Notice D'installation Et Conseils D'utilisation page 29

Playing on the alignment of the perpendiculars or the parallels, by taking some basic measurements,
establish the position of this first rectangle.
MARK OUT THE FIRST EDGE IN PLASTER
Once one edge of the rectangle has been defined and marked out in plaster, calculate and position
the other sides using the diagonals method: if the 2 diagonals of a rectangle are of equal length, the
opposite sides are the same length and therefore:
AD = BC, D1 = D2, and hence DC = AB
MARK THE RECTANGLE OUT IN PLASTER
Attach a length of mason's line at one point to trace the arcs of the circles.
ESTABLISHING THE REFERENCE HEIGHT
Once the position of the pool has been decided, the pool may be dug. However, before digging the
pool, the height differences between the 4 pool corners must be known precisely and the final height
of the WATER LEVEL must be carefully considered.
The point A is taken as the reference level or datum point O.
Mark the point on an indisputable reference, for example the top of a stake. Then, using a laser sight
(or a large ruler and a spirit level), make sure that the 4 corners of the pool line up with the reference
level.
To visualise the final pool water level, stretch some cord between the four corner stakes at the desired
height
NOTE:
The builder's level: a large, flexible transparent tube fitted with a transparent graduated section at
each end.
Fill the tube with water such that the water level is visible in both transparent sections.
The water level in both graduated sections is identical when they are at the same level (ensure that
there are no air bubbles).
PISCINES P-PSC
x
1
90˚
y
x
2
2020/05 - Indice de révision : B - Code : 37101
A
D
1
D
2
POOL
PISCINE
D
B
C
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