192
S. F. Elbeih and E. A. Zaghloul
Fig. 7 Simplified
conceptual model with
distributed recharge along
the transect (Patterson et al.
2005)
drinking purposes according to the Egyptian and WHO standards, respectively. Moreover, most of the groundwater wells were of the best quality for irrigation in terms
of salinity (less than 2000 mg/L) (El-Zeiny and Elbeih 2019).
4.5 Nubian Sandstone Age Dating
The recent age dating of the Nubian aquifer system confirmed that groundwater
reaches ages of hundreds to thousand years covering several pluvial and interpluvial
periods. According to Patterson et al. (2005), the geometry of the aquifer is represented by a triangle (Fig. 7). It can be shown from the triangle, that the age of the
groundwater is a function of depth.
5 Irrigation and Drainage System in Dakhla Oasis
Flooding irrigation system in the depression is considered one of the main reasons
for water consumption in agricultural operations. This system is based on flooding
the cultivated areas with water for long time durations during irrigation. Thus, a large
amount of water leaks during irrigation.
5.1 Drainage Network in the Depression
Drainage networks are one of the main factors influencing the distribution of ponds in
the depression. Accordingly, drainage networks and main ponds in Dakhla Oasis are
S. F. Elbeih and E. A. Zaghloul
Fig. 7 Simplified
conceptual model with
distributed recharge along
the transect (Patterson et al.
2005)
drinking purposes according to the Egyptian and WHO standards, respectively. Moreover, most of the groundwater wells were of the best quality for irrigation in terms
of salinity (less than 2000 mg/L) (El-Zeiny and Elbeih 2019).
4.5 Nubian Sandstone Age Dating
The recent age dating of the Nubian aquifer system confirmed that groundwater
reaches ages of hundreds to thousand years covering several pluvial and interpluvial
periods. According to Patterson et al. (2005), the geometry of the aquifer is represented by a triangle (Fig. 7). It can be shown from the triangle, that the age of the
groundwater is a function of depth.
5 Irrigation and Drainage System in Dakhla Oasis
Flooding irrigation system in the depression is considered one of the main reasons
for water consumption in agricultural operations. This system is based on flooding
the cultivated areas with water for long time durations during irrigation. Thus, a large
amount of water leaks during irrigation.
5.1 Drainage Network in the Depression
Drainage networks are one of the main factors influencing the distribution of ponds in
the depression. Accordingly, drainage networks and main ponds in Dakhla Oasis are