Found between Southern Bosque County and Eastern Fort Bend County in Texas, the Brazos River Alluvium Aquifer is a minor aquifer running alongside the Brazos River. The Brazos River Alluvium Aquifer, also known as the Brazos River Alluvium, is seven miles wide and 350 miles long and is one of the 21 minor aquifers that can be found in the state of Texas.
The makeup of the Brazos River Alluvium Aquifer is clay, sand, silt and gravel, and most of the water is produced in the basal portion where the saturated coarse gravels are found. The water produced is hard, but fresh, with some areas being slightly saline. Water found in some parts of the Aquifer has been tested and found fresh enough to drink.
The saturation has been found to be 85 feet or more depending on the area, and wells can yield up to 1000 gallons per minute, although most yield between 250 and 500 gallons per minute. The water level in the Brazos River Alluvium Aquifer is mostly stable and is replenished through seasonal precipitation. The Brazos River Alluvium is currently at good levels and it looks as though the drought has had no detrimental effects on the area.
A large percentage of the water in the Brazos River Alluvium is pumped for irrigation purposes, however this aquifer could be used in the future to help supply surrounding areas water supplies.
The Use Of Hollow Stem Augers When Drilling Aquifers
A Hollow Stem Auger may be used to drill through unconsolidated deposits like sand, clay, and silt. Based on the aquifers geology, different cutter heads can be used. Hollow Stem Augers work well for sampling. There are no additives used during the drilling; this is an advantage as it eliminates the chances of foreign materials entering the borehole.
The use of a hollow stem auger allows for specific depths when it comes to creating wells. Although the process is slower than other drilling techniques, it is ideal for drilling Alluvium Aquifers such as the Brazos River Alluvium Aquifer.
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