Aquifers may lie close to the surface or at great depths.
Aquifers can be hundreds of miles long and wide or narrow, shallow veins running through rock.
With such flat ground in the Grand Prairie, rainwater matriculates down through the porous sedimentary rocks where it is stored. Drought Extreme - A measure of the severity of drought on The Drought Monitor. The Drought Monitor scale ranges from D0 to D4 with D1 being the least intense and D4 being the most intense drought. Navigation and water quality needs remain the same year round. Fish and wildlife needs vary monthly.