العلاقة بين كميات الأمطار و ارتفاع الماء الجوفي في حوض وادي محيرقة بالمملكة العربية السعودية

الملخص EN

The Arabian Shield contains only shallow alluvial aquifers along wadi systems sometimes underlain by weathered bedrock.

Such aquifers are mostly unconfined and of limited thickness and areal extent.

These aquifers are recharged by local rain water.

Water supplies from shallow aquifers are not of large volumes, however, this perennial resource is locally important for domestic and agricultural uses.

Wadi Muhayrigah basin is one of the main basin in the shield area of the Al-Quwayiyah region where irrigated palm groves are the main crop.

Agriculture in this wadi depends on groundwater of the shallow alluvial aquifers along the wadi system underlain by weathered bedrock.

Since the estimation of groundwater recharge to a reasonable degree of accuracy is essential and vitally needed for the proper assessment and management of groundwater resources, the objective of this study is to examine the relationships between rise in water table and rainfall in Wadi Muhayrigah basin in an attempt to derive a regression model for rough prediction of groundwater recharge.

The relationship between annual water level increments and annual rainfall has been assessed.

The coefficient of determination is 0.66.

the values of F-ratio and t-test for correlation coefficient have been found to be significant at a better than 0.01 level.

The predicting regression model can be written in the following form: Annual rise in water table = -0.68 + 0.06x annual rainfall