The Cross Section, Volume 2, Number 5, November 1955 Page: 4
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THE CROSS SECTION
November 1955
GROUND-WATER INVENTORY CONTINUED
-FLOYD COUNTY
THICKNESS OF WATER-BEARING STRATA
FLOYD COUNTY, TEXAS
1938
LONE STAR
-~Q- ~> t5 X~> <:T~~$0000
BOUT A PLAINS
- TFRLEY --<
BOUNDARY OF WATER DISTRICT [
N N
"CEDAR HILL
N /
F. l'AD
NERN
....CE A .LL ...-
EXPLANATION HIGK PLANS UNDERGROUND WATER
TOISES! OF WrFER-BEARING STRATA SCALE CONSERVATION DISTRICT
EZZ ESS AQ $0 fTT I 3 4 N 7 N 9ONILES
Spvm AM FEET io 030 r PREPARED FROM RECORD$ Cf
rxv F0005 Oiw TBe' IXTATT ' THE ACUC+ PLAINS UNDEROREUCD COCCSCrwoRSr
WATER CUONSERVATIUT DI STRICT IEfAMOAI OSASST
f77 a0 o 1m0 ffr TAT U N GEULCICAL
9TA"POPITANDA TUE flCTE BOARD OF WUTER
FO eSf EET TA ce0 r EEER$UECT TD REC A
SjgjTOW~lT I ATICON SMDA ADDITIONAL DATA A MAULSM
Pt oow TiA? ? 3s0FE ARE II
Myg ilag $0 FEE BY 6W.PLATE ISAPPROXIMATE DECLINE OF THE WATER TABLE
FLOYD COUNTY, TEXAS
1938-1955
I ~~LON STAR \\
SOlfPLNSSTERLEY -
BOUNDARY OF WATER DISTRICT
A....N
FLOYDADA
<I AM N .
EXPLAATIONHIGH FLAWS UNDERGROUND WATER
APPEoxtABTE DECcLINE OF THE RATER TABLE SCALE CONSERVATION DISTRICT
~ZiI CEDAR FbLL
L.- KNEY - RW f&O T02U PEt ThRM J - FAC.AQ
WAO0030 CCTEETO co 'err TEC OLAUCAL UARA
L.N..LN. C 004 400P ETA 0 0 OreEy OF TE
rrnii RONT 1DENT ORBMTHOQAL DATA
MA! T .T r coo .
MBA ISE 0f$ VS.. Cf$$PLATE 2
The portion of Floyd County within
the boundary of the High Plains Un-
derground Water Conservation Dis-
trict covers about 600,000 acres of
land. (The total area of the county
is 635,520 acres.) The underground
reservoir in the Ogallala formation be-
neath the area within the district con-
tained approximately 12,500,000 acre-
feet of ground water in storage avail-
able for pumping in January 1955.
The above maps were prepared from
data compiled from a study of 831
logs of water wells and about 700
measurements of water levels in wells.
The map in plate 1 shows the thick-
ness of the water-bearing strata be-
tween the water table and the red-
beds in 1938 before an appreciable a-
mount of water had been pumped
from the reservoir. The map in plate2 shows the decline of the water table
from the spring of 1938 to January
1955.
The volume of water remaining in
the underground reservoir was de-
termined by subtracting the volume
of material unwatered since 1938 from
the total volume of saturated material
in 1938 and multiplying the remain-
der by the coefficient of storage of
15 percent.
These data show that 14,000,000
acre-feet of water was in storage a-
vailable for pumping in 1938, and
that 1,900,000 acre-feet of water has
been removed f r o m storage since
1938. In other words, 13 percent of
the volume of the available water has
been removed from storage since
1938. In the portion of the countywithin the Water District, about 75
percent of the water removed from
storage was removed from about 36
percent of the area.
The approximate quantity of under-
ground water in storage, available for
pumping, beneath an individual farm
may be determined by multiplying the
number of acres in the farm by the
thickness of the water-bearing strata
underlying the farm and then multi-
plying by the storage coefficient of 15
percent. Suppose the farm consists of
320 acres and has 200 feet of water-
bearing strata underlying it, then 320
acres x 200 feet x 0.15 equals 9,600
acre-feet of water available for pump-
ing. An acre-foot of water is the quant-
ity required to cover one acre to a
depth of one foot, and it is also equalto 43,560 cubic feet or 325,829 gallons.
An individual may use this informa-
tion to determine, within reasonable
limits, how long the quantity of un-
derground water in storage beneath
his farm will last at any annual rate
of withdrawal. This assumes of course,
that his neighbors pump a comparable
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 in-
formation will be prepared as rapidly
as practicable, for all the counties
within the Water District. Maps of
Deaf Smith, Parmer, Castro, Potter,
Randall, Armstrong, and Floyd Coun-
ties are now available.High Plains Underground Water
Conservation District No. 1
1628-B Fifteenth Street
Lubbock, TexasSecond Class Permit
Page 4
Mr. Z. 0. Lincoln
913 Houston
Levelland, Texasirrrr_ i rrrui wu ri i i ii iii i r --i -
PLATE I
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High Plains Underground Water Conservation District No. 1 (Tex.). The Cross Section, Volume 2, Number 5, November 1955, periodical, November 1955; Lubbock, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1532768/m1/4/?q=%22~1%22~1: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.