SMALL DAMS PETITS BARRAGES

H = Total hydraulic head;
Fig. 6.8 – Water head drop through the cut-off or grout curtain.
∆H = Water head drop through the grout curtain or cutoff;
L = Dam base width;
L’ = Cutoff width.
The hydraulic gradients can be expressed as:
H
I0 (Eq. 1)
L
H H
I (Eq. 2)
L L'
As L’ is well smaller than L, this expression can be simplified to
efficiency of the impervious barrier can be expressed as:
H
E (Eq. 3)
H
I
H
L
H
, and the
About the recommended location of the piezometers to be installed in the foundation,
compacted earthfill and horizontal blanket in Fig. 6.9 and 6.10 are presented some
suggestions according to the dam PHC – Potential Hazard Classification.
Potential Hazard Classification
PHC 1 PHC 2 PHC 3
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