'File 35/5 Development of Grazing Grounds (Supplies from Persia)' [‎28r] (55/118)

M m. effort to dlial&ato tM thi© tidal laflafaxee^
at-?-o^rt s bstm mdo to introdue© a correct ion factca? in oar Qaartorly
idil@li. ia bftsod on th® otate of tim tide Cat Sitra) at th* tiais of
■static: head ©'buerf^tisso* ftm oorr^ctioa is not tlis &wm fee? sadi obsorra-*
tiosi bat by ^proadstati<m it 3ms baa^ s^ascmabZy mill ©stablMied
that t.tee is a seasonal ’^sxiatkm in statlo head tba^oogbout the ysar* A
°hi$i w is apparmtly sotttbll^isd in iiBr©h*April sad a «Xoir n ixi A^ost-
Sspto b«p* Ksrk Mist he dew on this ^srtlmslar atudy before
©oaolixsitli data em fee praasatsd. Attaints Jto^ bem jEeds to eorrsXat®
this BmMmi'iX TOplatica with rainfallboth in Babx^in and Arabia j,
mmM mnm a at the ontor©^^ Ife data is fr$3lX&3&#
ing th^ raiirfaH in tbo ©r®a (Ooatral Arabia} but it is
to bo ma&fc eraata^ tlmn in tbs aoayHtai
^we ara otbar factors which laay bs respcaaibic for t*lds
mmww®&< asa&emal ohas^s, not th® least of ishidi is tbs fact: that th&
for irrigation vatar during the- winter snaths is lass ttoi facing
th@ ssumap* ! iSis redact to in withdrawal froia artssto walls sad a raising
af tfe irfol in th® Marge natural springs as a result of reduced tamssod
daring the cold waathar* wlJUL result la a local buiM~up of statio head
and be r®»paasibM # at Mast In part, for* tb® obaer^ad flaotmtiima*
If te> te&m stated previously that tho tocm regicml static head
mrto t&m mm WOO ft a in oesrtrul Arabia to a faw f*&% at Bebrain* thOfis?
tha am^.ittoi? of an eatabltood hydrmxlio gradient a state of ®quHitrii«
mil. ham l&m attained om* geologic tto depending cm the emouRt of iatoko
aud ti^- per^uftbility of the vaMr bearing strata* drilling of »Xls and
the arMfieiaX oreatto of other points of cmtlet will inevitably change
this stata of equilibrium m& the wi^idraaml of water trm any point
than t3» sstablMhsd ssattjral outlets met b© acooinraniod. by a popessare drop
M the r^os of artifiolsl vithdrasml is order to create a hydraulic gr^disnt
obieh will proaoot® that flow* Or put in smother way, withdiaMBl mst be
aososspmied by the creation of a hydraulio gredleost said as the h^id at source
cannot be altered ^ a reduction in the static head in tbft area of witMse^wal
iwxst be creatodv redact to In static head will be proportional to the
rate of withdrawals
tb» static head In the Mllnq, area has uadsrgone an appreciable'
drop over tho period covered by our records* fhis drop can be accounted fox
by the drilling of a large number of mLU for irrigation purposes m
Indicated by the soEteneiva emit ivation which hm been undertakoji in that
area within tb& Met decade* this decline has flattened out end static hm&
has undergo&e little chmge durto the tot seven years which would IMloate
that a state of ^qu'Ufbrltm has been attainsd under current- withdrawal ratosa
In Rsm^war 1941. a swjrvey wa® sjade In ths Mllaq area to dot amine the
mwmt of wato^ preduoad^ M a narrow strip of coast line extending ffesa
approsetotely miles north to approximately two miles south of Z&lXaq,
thor-© aro mre thaa 4^3 nativ-..< wells many of which ax© not even provided with