SMALL DAMS PETITS BARRAGES

2
Fig. 8.2 – Application of the parameter H . V
versus the PHC – Potential Hazard Classification.
for several Brazilian small power plants
Therefore, considering only the dam parameters it is possible to use the following
classification for small dams with low, medium and high hazard rating:
2
Low Hazard Rating ……………………………………….. H . V
< 20
2
Medium Hazard Rating …………………………………… 20 ≤ H . V
2
High Hazard Rating ………………………………………. H . V
≥ 200
< 200
The ICOLD recommends the application of the PHC (Potential Hazard Classification)
2
presented in Table 8.1, together with the parameter H . V , for a general classification of the
hazard potential rating of the small dams. Although the PHC method can be considered as a
useful method for assessing potential risk downstream, it is also recommended to consider
local and naturally occurring conditions of each dam, such as its structure and people,
properties and environmental conditions downstream.
2
H .
V
Table 8.1 – Potential Hazard Classification
PHC I II III
2
H .
V
2
< 20 20 ≤ H . V
2
< 200 H . V
Life Safety Risk ~ 0 < 10 ≥ 10
≥ 200
Economic Risk low moderate high or extreme
Environment Risk low or moderate high extreme
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