106 lines
3.6 KiB
Plaintext
106 lines
3.6 KiB
Plaintext
up |a a lew rnelres muss wuuld he (nmplflzly covered
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wuh .1 wuuden ham: severed wllh thck 5})!ka lhus
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pmvldmg bum made and mud pmleenun, (mud
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lanlss are lrkewrse pnneered hum wlnd losses. allhuugh
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Vapour Pressure all («use surne [055 m unshaded
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ranks Rouled eurrh unks nre snll wrdely used .n
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Ausrralra
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lur mare exrensree waler sysrems, skvalegics have
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rsnged lrurn Iluilmg ralrs or wax, ld lhe more
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pennanenl am elleerwe srnnegy used .n Sourh Alnea.
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where hrxaganal llonrs nl whllc surlaeed ‘llghl‘
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euneeele (a slurry ol eernenl, sand, .ne gravel and
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polyslyrene beadsl ure lluared ou| unlll rhe ennre
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salelnnenl surlaee ls eneered Thls .s very elleelwe
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where waler 15 ran' nr enpensne Lnrger and lrghrer
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rdhs euuld be nude 0! wzled prpe llnars and rhrn
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panels, bul rhe eunerere rs durable und su-nple, block
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are rar—senled beluw, and rhenspeelln gravxry Is as. so
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lhal rhey llnar deep enough In resrsl wave ellesl.
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Corners are munded m illnw an l0 lhe waler,
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STRUCTURE OF DAMS
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There are elk-(UV: apprnaenes |u rhe s|nl<l||ul
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elleeuvenessnl dams The “N l, le makc lhe darn .sell
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as a deep enunnl seennn, ,0 mar as lhe level lalls.
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sumee nren rs AM vapldly .edueed (a~ lhe square 0) lhe
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rnurusl Muth nl lhv name elleel rs aehreved m
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'v shaped valll'y sledge-s,
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Semndly, deep and shaded \ulllev sues elm lar beller
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pruleeled [mm sun and wlnd lhan shallow alleys. and
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ll elun us pusslbl: a shndsd easlrwvsl valley .s lusr
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Thlldly, a ~lmp|r Mmmxy ul malmg s sencs or 3A
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slurnees, each able le be drarned by gmvlly flaw |<\ rhe
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NM lnu r darn rs vrrv elleeuue llnr more so luau n
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slngle slorage ul rhe same lurlsee areal 1he syslem
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needs anwe management so rhal lhe use sequenee Is
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lmm lhe [up down, lhe mp darn rs dralned nno rhe
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erhers iusl when rhey ean lake any lesldnzl warer As
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eaeh ls emplred, evapnrihve surlsee reduees by
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nnelhnd, nun-lunnh, unennn and so on obviously.
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11w shall" rlrr serles Mm Dd!" llre «sun I| la Mun lu
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ereare rwe senes ul 1 darns rarher lnan l senes a! s
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dams Lrlse mum else .n lhe deserl, lhe seale ul
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eperauensdeerdes elfinulty, .nd ln lhrsease smaller .s
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rnrne ell enrl lune lml
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Despne all lhe pmumal problems wnh salted sells
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and warer. thaw are many me: n. desen ur dryllnd
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luulhllls where heshwaler spnngs and gxuundwaltr
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llees rhan zoo ppm sum an- ivallable, where shaded
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valleysenn be salely dammed, and where suns are ape"
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and lnedmnrne Endless problems and expense are
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Avoided .l sueh sllcs ure surelully rdenlrlred and
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seleeled wherever lueal lungAlenn loud pmvlsnm :5 0!
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en uvex~ndlng eoneern
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Miny rdeal sues lle m rhe rnner ullzysol spased lold
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moumimsv where deep sends over elay held many
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rnrllrons ul lures nl lreshwsler mum" l-nnn lne hrlls,
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and all rhal rs needed is a mllablc wrndrnrll or snlar
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pump le rarse lhrs waler u, a mesa ur nearby lull As
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rnssl rarely exceeds lho l. 2n rn level rn wann desens,
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n reused lank wlll lmgdle sub»|mpl(al' (mp on he
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upper hrll slepes, and .leerdunus phnks nndrng : chill
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lnnur am planud un rlre luwer slopes rhls snuanun rs
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cnnunun m hlll munlnl wnh reslneled euld uplands
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ll all surplus mum“ rs used m wel years In sel um
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luresl lrees held m nursenss, sueh nlualuyns quukly
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humus run anly susramable Mn sell-rehanr and lar less
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nublm ln senous dmughl elleer ll .a all a rnalrer oi
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ear-elul sue ehoree, Ksponslble behavlom, and medesl
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seale
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mun: ll .44
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mm DAMS m SERIES mun: EVAPORAHOM
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Eviwullnn his an In as we as m. ul 1 ml. darn ul rne sanu
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:29:ch alldesen dams are deaw unnul .n seem
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sums; n vouuue we
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,weeeweas wrrw mm» um
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bem'mgzrwé swaamw
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MW} Us A "(0me
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er mums) srvllewruu n Hex:
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PM W sat-w mums
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seems M54 n, we: we
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358
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