This paper presents least square equations for predicting some groundwater physical
properties (static water level, total dissolved solids, groundwater temperature) in Cross River
State, based on some climatic parameters (rain amount, air temperature). This was to assess
the impact of future climate variability on the quantity and quality of groundwater in the study
area. The results showed that irrespective of the geologic units and seasons, the static water
level (SWL), groundwater temperature (GWT), pH and dissolved oxygen (DO) were in stable
state conditions based on low standard deviation (SD) values. Secondly, in all the locations
occupied, the amount of rainfall (RA) and air temperature (AT) showed significant correlations
with SWL, GWT, pH, electrical conductivity (EC) and total dissolved solids (TDS). Predictive
equations using climatic change indicators (RA, AT) and groundwater physical properties (SWL,
GWT, TDS) were developed and used as a tool for monitoring the change in groundwater
quantity and quality due to climate change. The fluctuations observed in groundwater
properties (SWL, GWT) for the study period are attributed to the amount of rainfall and air
temperature. The variation in TDS is due more to the influence of seawater and brine intrusion.
The effect of geology was more or less insignificant. Hence generally, irrespective of the
geology, with known amount of precipitation and air temperature, future changes in SWL, TDS
and GWT can be predicted at least for limited management and environmental decisions in the
study area.