100 
Transactions Texas Academy of Science. 
Dumble^ Edwin T. 
tasrea it reaches an el evasion of over 800 feet. Like the Gaiadalupe plateau, 
it also breaks ahruptly do'vvn into the valley at its foot, dts former extent 
was much greater than the present, for it reached inward and covered all 
the intervening oountry to the base of the Guadalupe plateau.” * * * 
The Trans-Pecos region may be said to comprise plains and mountains 
in plains. 
Sources of -water supply: iSurface water, subterranean water. The 
Piver Systems : lOolorado, Guadalupe, Nueces, Pio Grande. Their drain- 
age. The Guadalupe Plateau — its Springs. The volume of water in the 
Rio Grande greatest, but -the topography of the adjacent country does not 
permit its extended use. The supply is ample for the immediate valley. 
The real importance of the Guadalupe -system in agricultural development 
not yet recognized. 
The main river system of the region is the Nueces. Its origin. Inter- 
mittent flow of its branches. The storage of water suggested by building 
dams in the canyons. Site for a dam -on the Rio Grande. 
'Artesian Conditions. The great springs found along the foot of the 
plateau are artesian. “When the lowland or valley is reached, this -same 
water-bearing bed can be found by boring wells to it, and in many places 
it affords very strong flows. The water of the artesian wells of San Antonio 
is supplied from some of these beds, although there is a little uncertainty 
as to their exact horizon. iSimil-ar wells, can be had at -many places along 
the line of -the -Southern Pacific railroad west to Uvalde, or between -that 
line and the foot of the plateau.” 
The Water- bearing Sands of the Tertiary. Dip towards the Gulf. “The 
most northern of these, and the most important as- well, occupies a belt 
of country from Calaveras, on the San Antonio river, by the way -of Ross- 
ville, Devine, iBatesville, -and Ca-rrizo Springs to the Rio Grande.” Water 
from the upper part of the beds usually somewhat mineralized. 
“The next water-bearing sand i-s that belt -of -brown -sandstone which is 
seen all along the International and Great Northern railroad from Cotulla 
to Laredo.” iSmall flows. 
“The third belt is the sandy portion of the Fayette beds. These beds con- 
tain more clay than do the Oarrizo beds, and are not so free of deleterious 
matter, consequently while they will furnish lartesian water -at many local- 
ities, it may in many places be mineral water.” The Oakville beds might 
be expected to furnish water in -the coastal region — in some cases salt 
water. 
The Reyno-sa iS-and. 
Trans-Pecos Texas. No artesian water. Topography. iSuggested dam 
sites. Storm wa;ter3 its only hope. 
149. 
Some Sources of Water Supply for Westem Texas. 
See the preceding paper. 
The San Antonio Daily Express, Wednesday, Dec. 5, 1894. 
