Authors :
Azaiez Naima; Zoghlami Karima; Nawal Qhtani
Volume/Issue :
Volume 7 - 2022, Issue 5 - May
Google Scholar :
https://bit.ly/3IIfn9N
Scribd :
https://bit.ly/3NiyoBM
DOI :
https://doi.org/10.5281/zenodo.6691802
Abstract :
The subject of mining and the spread of openpit clay quarries in relation to the problem of flooding
has generally been treated in a causal sense. Generally,
the extraction of useful substances leads to a disturbance
of the ecosystems, even if the contractors commit
themselves to meeting the standards and criteria
indicated in the contract specifications during the
exploitation and rehabilitation phases. During the last
two decades, flooding has become more frequent and
severe in the agglomeration of Bni Hassen. The
residential areas have invaded the majority of the land
previously subject to the overflowing of streams and
floods. For their part, the structures of "maskats" held
upstream by a system of "Mgouds" and "Rabtas" are no
longer capable of capturing runoff water as before.
Despite the dredging of the bed of Wadi Sayala and its
channeling in 2019, the floods of September 20, 2020,
have caused loss of life and considerable damage to
property, including infrastructure and agricultural land.
This disaster could have been much more serious and its
consequences heavier on the inhabitants if it had
occurred outside the context of the exploitation of useful
substances. In fact, the excavation pits played the role of
real retention basins that surround the convergence zone
of Wadi Sayala and Wadi Gamgoum. The study area
had more than 29 mining pits with a depth between 5
and 47m. The objective of this research is twofold. First,
to study the manifestation of the flood of September 20,
2020, in the watershed of wadi Sayala. Then, to make an
estimate of the volume of water retained in the pits,
which will be at the end the subject of a classification in
term of storage and infiltration. This study shows that
the total volume of runoff was reduced by 18% thanks to
the presence of extraction pits.
Keywords :
clay quarries, hydrological modeling, risk of flooding, hydrosystem of the Sayala wadi.
The subject of mining and the spread of openpit clay quarries in relation to the problem of flooding
has generally been treated in a causal sense. Generally,
the extraction of useful substances leads to a disturbance
of the ecosystems, even if the contractors commit
themselves to meeting the standards and criteria
indicated in the contract specifications during the
exploitation and rehabilitation phases. During the last
two decades, flooding has become more frequent and
severe in the agglomeration of Bni Hassen. The
residential areas have invaded the majority of the land
previously subject to the overflowing of streams and
floods. For their part, the structures of "maskats" held
upstream by a system of "Mgouds" and "Rabtas" are no
longer capable of capturing runoff water as before.
Despite the dredging of the bed of Wadi Sayala and its
channeling in 2019, the floods of September 20, 2020,
have caused loss of life and considerable damage to
property, including infrastructure and agricultural land.
This disaster could have been much more serious and its
consequences heavier on the inhabitants if it had
occurred outside the context of the exploitation of useful
substances. In fact, the excavation pits played the role of
real retention basins that surround the convergence zone
of Wadi Sayala and Wadi Gamgoum. The study area
had more than 29 mining pits with a depth between 5
and 47m. The objective of this research is twofold. First,
to study the manifestation of the flood of September 20,
2020, in the watershed of wadi Sayala. Then, to make an
estimate of the volume of water retained in the pits,
which will be at the end the subject of a classification in
term of storage and infiltration. This study shows that
the total volume of runoff was reduced by 18% thanks to
the presence of extraction pits.
Keywords :
clay quarries, hydrological modeling, risk of flooding, hydrosystem of the Sayala wadi.
