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PRECIPITAYION INTENSlTV

rum/day EXAMPLES AND PHENOMENA
mo Lrgnl dew: 10,3), llgm rams in
semr—and aleas w, orarne lama

(a). TM smallesr nlls commence
"VA! 3! 5-l H mm.

All day drizzle 112), sneer eroslon
can occur at l3, gully erosion can
develop al 15. Dlversmn dralns in
fils1 and second order streams wlll
llow. Typical ol rams ol numrd
ooasls, warm lrorrlal air masses.
2\»50 Typical el monsoon sloud streets
on coasls, or lipnl ram all day m
weslern ma me olrmaleo. and
pounds 0! oonvecuonal raln m
deserls

51—100 Th! candansallon 0le "or"
onshore legs (so mml, lrooleal
rams exceed loo mm once a year,

100400. Heavy ram all day. and exceeded
once a year on monsoon wasls.
lrddawind coasts. Exoeededonce
per century rn lemperale manllme
areas,

 

Milli n I
RUM—OFF FRDM VARlOUS suasleEs.

v. RUN-OFF SUBSTRATES

a coarse sands. Active dunes xnd
dunes m dune seas.

5 Foresmd.

lo wooded and grassed areas, russodr
gmssldna

l5 Culllvalad sands and sandy learns.

zo Applalumau Average Ilgum lor
sow-and and and areas.

25 unmixed sreoon ol mind shrubs.
ldros. gram:

:lu blamed and whlvalad clays Ind clay
loams.

50 sraoo. and almmland grazed oy
wad ammdle

5n Undumed clays. claypansmbarl
maflsd area

all Skelflal souls and whit-d
vagelallon,

70-93 Compound rolls. seldom sous,
non—wemng sands, anamm paved

areas, lull wally srorsw.

 

 

 

 

rangelands, mmfldccmses, However, n nsas rapldly
as perennial prime or lusiock grass u ln nn-n replaeed
by hunu ground or grazed-our areas wnere only
Ephemls on annual grasses ean flmn'ish. surnrne nl
elump grasses, therefore, lras a sudden elleer m
mausing walee omen,

- SEASON Runwolf has us mosl drsasrrous and
eroswe elreas arrer long dry surnrners, hmdsc-ll: mes,
exlenswe aulumrr or spnn, cullivatlml, and .n leer
supsequern lo any period ol slress on llre landseape mar
reduces vegzhtive cover ll rs a| urese periods rlrar
“unmasms more gullrea, llood man sells, and cause
|M sell collapse do. an aeaee sakzd sorls,

- Almrlculm SEALED AREAS. Roads, parlnng
areas, noose rools, hare nxk, eonereled open dnlns,
and sompaeled areas or senlenwno nll produee naslr
Iloods m nearby sneonns rlre areo ol rnese lolal run—err
syslems rn earslrmenl musr be ealeulaled rr ededme
fined mardarwn syslerns are lo be planned

- so". AND ROCK WI’E m cATcl-lMErx-l, naprd
rornlall mulnallon oeeors only m coarse or open sands,
sandy loarns, knuwums ldeep, wellelnrerured sods),
and soils with lanes or more nnrnos wnmnl None
were-n5 sands. sealed elay souls, compaered sons. and
sheer mzk or mush/e mtk domes all shod waler

3M

rnprdly Alusolmh lype need lo be mapped or noled
m llre althmm under sludy,

Gravels and bouldereloanks. rlrallered Mk ndges.
uneonsolrdnled ptdlmem wasres, llmeslone oulerops,
and eroded lold ass all an as rnlake mos lor lq'llllels
These wll] remain open and reduee nmeorl unless us
an happen in deserrsl, une blawn duals and sands
eury rho-(revues and boulders, or wash down rnro lock
erevrees lo seal llre aqurler lnrakes. OM: rlns oeeurs,
spring wrll cease ro flow and warhnd water flow will
rnernnse

- 1-le wnellrer as a resull ol well~disptrwd and
lowemeensrry rims (I-2 ern per dayl, or or lmpedlng
surlaee laerors suen as tusmck. lrller, pebble, m arnneal
pmillg and eomour banking, waler wlll mak lneo soils
wulnoul run—0U over perlods ol {mm so mrnules m
sands, and lrom 3—4 days in day-ham“ solls. Thus.
wt need larger anificial amuse apathy m elay arena,
ur we rrsk dmwning plane m hollows av" me perrod
ol mhllramm. Mosl planrs ean warnsrand 2-3 days 01
noodurp.

Ideally, lsosl olanl promo resulrs lrorn 11,54 2 m of
sanuared sod, and lnallmron roles olurlsdepllr should
be rlrned m . prl mm wened, lhen lrlled lo (ask
rnrrllrrnon umel so um um doprl. 015ml rs wmed rn