Conclusion
The Sefrou watershed occupies the SW part of the Sebou watershed. It is
extended over a total area, up to the intersection with the famous Oued
Sebou, of 404.89 Km² with a perimeter of 127.42 Km; that is 1% of the
Sebou watershed.
The morphometric parameters show that the Sefrou watershed is elongated
(L=56.43 Km and l= 7.18 Km). The hypsometry is characterized by
altitudes that progressively decrease from the South to the northern
part of the basin. According to the hypsometric curve, the altitudes
between 500m and 900m occupy most of the surface of the basin. The
relief is relatively strong according to the global slope index and the
specific gradient. The hydrographic network is very important on the
eastern bank than on the western bank, and this is related to the
lithology and the vegetation cover.
In spite of the diversity of the lithological formations that outcrop in
the Sefrou catchment area, they can be grouped into two large units the
southern sector (the Middle Atlas “cause”) which is characterized by
essentially carbonate formations constituting a highly developed karstic
system thus conditioning a high permeability in this part of the
catchment area.
The rainfall collected in the stations during 1970/2011 is characterized
by fluctuations between the different stations and hydrological cycles.
The mean annual and monthly precipitation is