WSP11739

• File Number: 8443.400
• Description: Narrows Project - Reports
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 1/1/1963
• Author: US DoI USGS
• Title: A Primer On Ground Water
• Water Supply Pro - Doc Type: Report/Study

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kind of rocks they penetrate. :\Iuch of what he
i~ intl:r~:>ted in i~ helOh the depth of ordinary
exc3\"ation~, and he cannot afford to drill a hell
or te"t holt- in ewry plan' where he need~ infor-
mation. Records of wells wht'f(' the driller ha...
carefully lng-g:f'd tht. depth and tyfX' of different
rock ~trata arc helpful. A really t1-.eful w('1l record
will include the following: sampl~ of thl' rock...;
information on which "trata yield watcr and how
freely: "here the \\ater Ie\el ..tood in the well a-"
each "uH"e"..i\.dy deeper 'lratum was petlclrated:
and data -from :1 pumping: or hailing te:->t of earh
water-hearing- "traturn shoh ing hm\ much wate:r
W.I-" yielded and hm\ much lht. water Ien'llow-
cn'd at the ~>in:11 rate of pumping or hailing:.
The hydwlog:i~t \\ ill thcn make a contuur map
of tht, u'ata tablc. The water tablt, is the top of
the zont' of s.1.turation- the zonc in which all the
rock.\. are saturated hith water (6,C:. 3). The
hydrolol.,>iq mea.,urC'!i the depth from the land
surface to the water table at wells. :'\cxt ht' de-
termines, eithn from a topographic map or by
"un'eyillg'. how high Iht' land is abon' "t'a le\.el,
Finally'. he draw.. lin~ [0 ("onnen all the point~
of equal elt'vation of the wal("f table. so that the
map -"hows the "hape of the watn table, in the
same way that a \Opographic map shows tht'
shapt. of the land ..urfalT, Tilt. waitT-table map
is {'specially impnrl.1nt !Je{'3U-"l' it gin-s a c1ut' not
only to Ihe deplh below which ground watn i"
~tored, hUI also In tht. din'clioll in "hich tht' water
is mO\lng, H then' is am- slope tD the water tabl~.
tht' water mows in the direflion Df the slope
(fig, el),
".hert' there art' no welk or not t'llOugh infDr-
mation Dn ('xi~ling ont"'. the hy'drolo.c:ist may haw

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FIGI'RF 'J.-Fold..d alld d15plaud Tock,_

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to put down some t("<ot holes. If only a shallow
holt' has 10 bt. put down. a small power auger.
hhich hill bore to a depth of aOOm 100 fect. can

A,-SMAll STREAM WHERE IT fiRST HAS
WATER IN CHANNEL

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B,-DRY ZONE LIfTED UP TO SHOW
SURfACE Of SATURATED ZONE

FIGI'RE 3--Th~ u:r:rn tab/t' and mor'(ment of
l:round .t.ala.