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memex/0_inbox/books/PDM/Bill Mollison - Permaculture A Designer's Manual text/476.txt

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grass, hut iorussed by boliles or eurved glass. and
welding, ellnpllre, and elgalerle aerldenrr. ln all,
llghining and aelidenrs are perhaps only a or so oi
ioral lrresl lhe vasl lnarorlry ale hr by lllisehieyious,
psychoparhle, or even wellenleanlng people. A iew
pyrolnanlael ilghl and allend rnany lires, and even
enlisr ili yolunreer llreilghiing org. sakxons, m
aborlglnal or rlloal peoples, an angry person will
sorneonns burn oui asalnp or ioiesl
FACIORS THAT INCREASE ms lN-rENsl'nr 0R
SPREAD
oilee inlrlaied, wlldlrre ean spread wr|h gleal speed.
grass hles spread alrer hell am iarler ihe dew has
dried om, lorelr oils horn rlildday or 3 pm. Alier .n
inuial ilaleup, an hour or so surllees lo develop
flmwrm wildxllons, alded by.
. Lam hlels oi srlirller ihan o eili dlameler, grasses
and silels, al less rhan m. wnler ronlelir is ehluilr ol 75
x so lnln pine, unpainied, ran be weighed to judge
liuoiidiiy and wood drynesl, where saiuraled, rhis
wood is lodged ar loom. l-ine woods erupr ae less rnan
m, hurnidiiy or mouluie sonierri due ro iugh luln or
oil eonrenl.
. Wlnds olhorii I060 loll/h areeleralesplead, as ihe
square oi lhe veloelly. Lg, ar 20 lliii/h, ll
ihe spread is 2 lon squared per hour, rhen ai so lull/h,
ihe rare ll 4 loll squared per hour. Al hlghrr wind
speeds, rorlgues ol lire break up ihe Illeilonr A| lw
ion/h, ground rues iroysell-exongulsh.
a mud; "backmg" lshriilngl late in ihe day may
blow our . ills flank “no a broad lroril, or even blow a
(lie back on lisell and lnalre ll saler However, oaelnng
winds are unpredirrable, and in wlldllre rhe best
srlniegy is «o order an early eylrusliori or a broad area
ereepl ior reanls lln sale lerugesl whose rob u ls ed pui
our lnlnrrr huuu In: in ihe illsl lulflmux alier ihe rue
has [used Fur lhrs reason, iolesied suburbs need loeal
refuges (gravelled areas wlrll underground shelm), as
do lsolaled hollleiieads. and long sllelehes oi roads
thmugh irularriniable loiesis.
Midfile will always oellil oil and borders; rhus we
need lo hlsi oe able lo live wlih lire, and perhaps only
wwmianly lover a period or yearsl design lo ellelirde
[HE horn senled areas by a combination or:
o Alrering lne yegeiarion ia ereaie lnlne ole—ilnniune
sysiellis
- Desrgning danls speeirlrally lo noodrlow over
hillsldes subyeel lo rue
. Mechanical or glazing removal or ruels ills: belore
breadallgel penedklhls lneludes dead irrirsh, long
dry grassesand ihe dead lower bunches ol lrees,
ln noll—llrhabired rleas, bolh “tool” rues (damp .nd
eool wellherl and "hill" riles idry periods) are some
lirlies lii es a llianagelnenl lliosair io preserve VHF
dependenr llola arid 1auna;ihisls unsale and dirllruli
lo miml, and ollen muses hles
Houses, dense surrounds, village surrounds, and
452
iruown plannng lol lrle lolesls al rhe base ol sellled
slopesl should all be deslgned ro lnlnirnlse rile darnage
and inorialrly File an be expeeled al wlldhle on a
lnole or less regular senedule ln specilk yegelallon
lypes al aboui so years in wel selelophyll loiesl, Ho
years ln dry slyannah. and even annually ln
unblowsed grassland. Thus, rile prouldes a speed-re
ploblelii lor designers and landowners progressing
oooi grassland io lolesl operarlonl, From 3.5 years, or
uniil (areal esiablshrnenl, ihe sysleln has hlgh hre risk
and we need lo programme plarihlig oiosails lo iedure
dislrlo risk.
mean“ is a way or decreasing llle rlilensily,
loads ICI as Illebleal, as do ponds, lnarslies, livers.
srony aiels, and sulnlneregreen or sappy plani props
hedgerows. Horirorual hrebleah weakens or iedirles
ihe lire hunk energy, Veroeal lirebluak, lo preronl fin
”auwmng" iri liees, re res on rhe relnoval or lower
oranlhes, dead nee normal, and perhaps ml planllng
sappy ground coral under ihe iolesr
No rueoleah leyen in km or warerl ls eiieeilye in
llleslorrns, as lire raniadoes, wllh aseeni yeloeicies ol
up is 150 mm roll dr-Idup on ihe lee rrdge srde ol
hills, iraselllng downhill and hhillg aloli large logs and
braneher arid pieees oi houses, and clearing niassiye
aerial gaseous explosions The ground winds near rhe
base oi lhis rolurnli lsonle lens oi lnezies across) ean
reaeh lno loll/boar and will roll people over and over
The noise ls dealenlng
ln lhese lornadoa, or in more nilnor whirlwinds.
lMimitsflml riiaierlal is earl-red alon and dropped our
ironl I40 kill dowliwuid ro srall ilesh lnes, and hesh
nresiorln sequemfil igilre 5.2!.)
in lowns, lire ll-slsranl desrgn (fur wildrirel has lhese
Ieaiilles
r a sllnple m0! and wall ouillne lno iniernal loor
valleys or le—enrranr wall eorners io pile up lnrandese
eenl ashl
. No iarpaper ioor lining proreellng lnro guilers.
loo! guuers should have erlher a leaI-rree prnllle, or
can be plugged and waiel-hlled in ihe erenr oi lire
(plugs are nandlly thinned ro ihe guriel near
dowripipa) Rool spares olien alien alighl horn leaves
ln ihe gulier
- No unsereened windows. underfloor, or wall
eairiry vull spares, all need nnernesh oieral screens io
iudueesparlrsire Even beds ean enrrh ahghr wlrh large
embers, and rellais or underfloor spares lliay have dry
rilewood or lilel lloulds sioled lhere
- No inflarriliiable dool lnars, nor wood piles or
shrubs lgailrsi ihe house walls large earls ol perlol, or
elplnslve rnaierlals, should be sioled in a shed away
horn ihe housas, hghily hdded.
SITING or HOUSE AND BUILDINGS
ln sireprone areas, houses are ar lnosl danger irooi
upslapr lire; lew houses suryioe wildllre on snarp
rldgeiops, or ln hill saddles lhar have dlvrrgrlig
i-ldgellnes nearing a wind lhlel rilnnel cflrd The sanie
tunnelling nr illrensrllearlon oi lire ls ereaied by