moving lhe mum-mg smps unul lhe wilEV level lsn
both cork finals) IN u pmdsdy lhe Sim messumnenl
marked on lhe stakes loam lhe lubes

ln lhe lleld, une person walks pesl lhe other
:lle‘mnlely. dnving a sub every I: m ls In all m 50
[2(1) m gulde 31350: or mnehlne operators, and allow-
mg len lhe else (at mll ol dnlns by allowing une (ark
ball Io he in ml. or so lewer lhnn m: ulhee nl lne nrx|
peg, moving me pole up at downhill m aduev: lhls,
The flakes mustbe kepl v1mn| when mlasunng

l cm in 5 m .s l-lllu x s equels l-soo (all, ample for
enusl divnsiml drains In carry run-ell le dams Dead
level llnes can else be mn M'mss landscape, end dam
wells eheeked run level or m used lor mdsl a gemle
use I mntly saw 1 I2 km dmn "owing gemly all lhe
way "I sand at l mu. lu.d..n nul by a skilled surveyun
uul by two wmnen hned lune week and ruined .n 30
nnnules en a hose level.

THE PLANE TABLE is a shudy lnpod wlueh (an
huld a Ufihaptd puee ul plum tube on sham curked
and dhbubbied as (or me hnse level, eseepl nus all
“M be 5 velled iboul us 515)“ “I all dinaians mime

 

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used mm mm. (aim-ll Ismlnifl) m mum mlnu: luu
nuund . Ml

 

9.7.3). many Iubmg, a bowl ul WIM on wind: films
a pleee ol pslnled wmd wuh lwn mus ol qufl lehglh
:5 ”nghfl‘ wllldeiglne 9.7,».

Although Model a ls sufrlevelhng, u may be
necessary R: up In an! nil‘ a 1m un Model A by way ol
admsumnl

Tn died a plane lable, sel up lwd marked slekes
lwnh usdyrvislbln whlle mash“! lapel a lmle up h.ll
[mm lne pelnl you will stand .l, dnvlng [he mus lo
level using lhe \dbk

Vlewlng lhe stakes lmm posmall a wl|h lhe plune
leule, cheek "til lne level snows new level marks lb) lo
be exactly .he same dlslnnee ldl bduw lhe slnke mp5
unessuve lnisl One can lnen proceed lu level, lmm
panda" B, anylnlng Ihal can be staked, Pinned, or
nleleed uy anmher pensen (figure am

This .s a vuy handy atmsvvaflev level ld see ln
slphdns, or u) find mu when lhe oullel ul a dam will
send walk! by We and gravity flow, or u: see u e hlll
en wlueh you wenl I0 plnee a Ian): el 4. dlslnnee .s
hlghenhnn ynnrslmwer heed .l home

leeflmg need an|y be done onee if done right ll in
ml doubt, buy a dumpy level or lhedddlne, and read
lhe Inslrudmns, or ll wealthy and lnmlnyelem, hue .
surveyor lwhnse mfl lab is mapping) Thousands ol
mllrs a! dam: have been surveyed, and levels sel, by
very simpk mls Plane cables 0! Venous deslens «I!
used by survtyms, lml lhese usually lnelude a lelesmpe
lee \nng ensrsnee walk

Ralph Lung ul Ausmflia has dewsed a mum.
.nnunled Ichrl whlch he has sueeessluly used lu eul

 

     

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MEASURING run wcnmv or m: PLANE ml:
run sums and M msmunancmcyuh Mel

 

   

 

 

233