The Cross Section, Volume 2, Number 11, May 1956 Page: 4
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Page 4 THE CROSS SECTION May 1956
GROUND-WATER INVENTORY CONTINUED-
LUBBOCK COUNTY
THICKNESS OF WATER-BEARING STRATA
LUBBOCK COUNTY,TEXAS
1938
s -. . . -. . . - . . . ABERNATHY
NEND
1\
-.- ooon
L A
N N
// \ LUBBOCK N N\ N \\\\`
~~%A9GNWmined by subtracting the volume of
material unwatered since 1938 from
the total volume of saturated material
in 1938 and multiplying the remaind-
er by the coefficient of storage of 15
percent.
Some of the irrigation wells in the
north central part of Lubbock Coun-
ty draw water from crevices and solu-
tion channels in limestone strata in
the Cretaceous rocks which underlie
the Ogallala formation in that area.
Pumping from the so called "crevice
wells" causes a decline of the water
table in the Ogallala formation; there-
fore, it is evident that the water in
the crevices and solution channels is
derived from water in storage in the
Ogallala formation. The thickness of
the water-bearing material in the
Ogallala formation underlying any
particular farm, therefore, is a practi-
cal measure for the determination of
the quantity of water in storage avail-
able for pumping.
Some areas in the eastern part ofEXPLANATION
THICKNESS OFi WATER--StARlee STRATA SCA LE
LESS $ANasorpr a I 5 ] 4 N 7 9 $1 ILES
FPAQ So mrt m0 xv PETT
D FAWM AVF11T TQ0M FErT PREPARED FROM RECORDS OF
-ATR CONSERVATrO DRAIT0 T
onA wr 70 MOr THE S EOLO CL TSRVEY-
SIj ON WHNE ADDITIONAL DATA
AR SE AVAILABLEPLATE
Lubbock County in January 1956
contained about 4,630,000 acre-feet of
ground water available for pumping.
In 1938, Lubbock County contained
about 7,350,000 acre-feet of ground
water available for pumping and about
2,720,000 acre-feet or 37 percent of
the water was pumped from 1938 to
1956.
All of Lubbock County, about 570,-
000 acres, is within the boundary of
the Water District. The accompanying
maps were prepared from data com-
piled from a study of about 1,600 logs
of water wells and about 400 measure-
ments of water levels in wells.
The map in plate 1 shows the thick-
ness of the water-bearing strata in the
Ogallala formation in 1938 before an
appreciable amount of water had been
pumped from the reservoir. The map
in plate 2 shows the decline of the
water table from the spring of 1938
to January 1956.
The volume of water remaining in
the underground reservoir was deter-HIGH PLAINS UNDERGROU5D WATER
CONSERVATION DISTRICTEXPLANATION
APPnaxMAlTE DECLINE OF THE WATER TABLE
EZ on s rer 70 f 0070
E W3 S m SO 707740P
PAm to Frrr 705 0 FPF0
FXW 50 FETI P 40 FEET
FX b m FEETLubbock County have a hundred or
more feet of water-bearing material,
however, some of the irrigation wells
have rather meager yields in gallons
per minute. Logs of many of the wells
in the eastern part of the county show
that the Ogallala formation consists
mainly of very fine-grained sandy clay
and clay. These fine-grained materials
reduce the permeability of the water-
bearing strata, and are responsible
for the meager yields of the wells.
The approximate quantity of un-
derground water in storage, available
for pumping, beneath an individual
farm may be determined by multiply-
ing the number of acres in the farm
by the thickness of the water-bearing
strata underlying the farm and then
multiplying by the storage coefficient
of 15 percent.
Suppose the farm consists of 160
acres and has 150 feet of water-bear-
ing strata underlying it, then 160
acres x 150 feet x 0.15 percent equals
3600 acre-feet of water available forHIGH PLAINS UNDERGROUND WATER
SCALE CONSERVATION DISTRICT
I 5 3 4 s 6 7 e i sI MILES
NMA1AS 1& McFAAY.MO
PREPARED FROM RECORDS OF
ATE COSERVA10T DISTRICT. L/r L 5osr
O E ADDITIONAL DATA 070 WILLI
I R AVA0LABLE.pum ing. An acre-foot of water is the
quan ity to cover one acre to a depth
of o e foot, and it is also equal to
43,560 cubic feet or 325,829 gallons.
An individual may use this infor-
mation to determine, within reason-
able limits, how long the quantity of
underground water in storage beneath
his farm will last at any annual rate
of withdrawal. This assumes of course,
that his neighbors pump a compar-
able amount of water per acre on their
farms.
These maps and studies of this type
are parts of the regular hydrological
work in progress by the staff of the
Water District.
Similar maps and information will
be prepared, as rapidly as practicable,
for all the counties within the Water
District. Maps of Deaf Smith, Parmer,
Castro, Potter, Randall, Armstrong,
Floyd, Bailey, Lamb, Lynn and Lub-
bock Counties are now available.sexl '>paoqqn-I
400J1S 4u004}i: g-89L
L 'ON P!J4sla uoi4eaaesuo
asseM punoaiaapun sueId 46!H4!wed ssei: puooes
APPROXIMATE DECLINE OF THE WATER TABLE
LUBBOCK COUNTY, TEXAS
1938-1956
Dto
HURLWOO
I CARLSLE -- LUBBOCK
WOLFORTH
SLATONI""'""
Page 4
May 1956
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T HE CROSS SECTION
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Reference the current page of this Periodical.
High Plains Underground Water Conservation District No. 1 (Tex.). The Cross Section, Volume 2, Number 11, May 1956, periodical, May 1956; Lubbock, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1532774/m1/4/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.