(GP/GT) for Additional Water Supply in the Lower Rio Grande

Matrix of
Locations!') and Descriptions!') of Productive Zones of Brackish Groundwaters In Cameron and Hidalgo Counties, Texas
Character of Hydrolo gic Unns Generalized Water- Projections of Recoverable Volumes
System Series Formation Material Report: 316(» Bulletin 6014!') Bearina Characteristics") Individual WeH Yields (gal/mini Potential Supp~ Volumes
Quality
Considerations!')
Not.,:
Q Yields moderate to large For Lower Rio Grande No perennial yield data Is
U Alluvial quantnies of fresh to slightly Groundwater Reservoir: presently avallabie for the
A Recent Deposits Sand Mercedes slightly saline water near overall study areas,
T of the & Silt Sebastian the Rio Grande In Cameron Maximum Yield = although n has been
E Rio Grande Shallow and Hidalgo Counties. 2900gpm estimated that the entire
R Groundwater reseNOir would yield
N Chlcot ReservOir Average Yletd = 75,000 acre-feet of water
A Beaumont Mostly Clay AquWer 1200gpm per foot of drawdown of the
R Formation WlIhSome Lower water lable.!·)
Y Pleistocene Sand & Silt Rio Grande
Groundwater Yields moderate to
Rasarvolr large quantities of In that portion of the study
fresh to moderataly
area just wast of Brownsville,
Ussle Clay, Sift, saline water. at least 350,000 acre-feet
Formation Sand, Gravel, Unn-Faysvlne No available data for of fresh ~ slightly laline
& Caliche Groundwater Mercedes Sebastian groundwater Is estimated
Reservoir and Unn - Faysvlne to be In storage, and
T & Groundwater Reservoirs computer Ilmulatloni have
E Clay, Sand, Indicated that, by maln-
R Sandstone, Evangeline Yields moderate to lainlng a spacing of 2000
T Pliocene Goliad Mart, Caliche, AquWer large quantities of feet, a supply of 9-10 mgd
I Formation Umestone, & tresh 10 slightly can be produced on a long
A Conglomerate sallnewater term basis.!')
R
Y
Mudstone, Yields moderate quantnles Maximum Yield =
Miocene Oakville Claystone, Oakville Oakville of slightly 10 moderately 600gpm No available data.
Sandstone Sandstone, Sandstone Sandstone saline water In north-
Tull & Clay westem Hlldalgo County Average Yield =
125 gpm
(1) ReMr to Exha,it t •• '.prlnt of ~ from TWOS', Report 3'8 entitled Productive A, ... of the Malor SourcH of Groundwat., In the low.r Rto Granda v.ney
(2) A lub.tantl,. part of th.lnform •• on pr.anted In til_ matrix"" been taken from Tab .. , of TWOB', Report 318 .ntlled Stratigraphic and Hydrologic Section of !halo.., Rio Grand. Vall.yAr ••
(3) Tok.n loom Tabl., 01 TWOa R.port No. 31 e
Concentrations of
silica (SIO,) In the
range of 30 to 50
ppm have been
ldentf18d In certain
wells, and these
concentrations of
silica could severely
affect water recovery
from the RO process.
High suWate (SO.J
concenlrations are
also prevalent In
some areas and could ,
affect water recovery
from both the EDR and
RO processes.
(4) Bued on lnbrmellon takan from Tax_ Bo.d 0' Water Enqlneel1l' Bulletin 8014 Voluma1
(5) YJ.1dI of welts: .mall.