The population increase and stride development in ArRiyadh city has triggered water consumption
exponentially. Excessive utilization of water for domestic and city services has increased infiltration
which in turn has led to water level rise in various parts of the city. Keeping in view, damage to man and
environments, various drainage schemes were constructed with the objective to check continuous
water level rising. The gravity drainages were designed as consisting of horizontal drains collecting

Arid regions are facing constant threat to the sustainability of fresh water
resources. This has prompted the need of replenishment of groundwater
resources and quantification. In the present study moisture variability and soil
characteristics of a sand dune in Al-Qassim region were investigated. Soil
samples were collected from four locations in a sand dune area. The temporal
moisture contents at these locations were also measured at variable depths
down to 3.5 m from the surface. The occurrence of rainfall was also recorded