141 lines
3.7 KiB
Plaintext
141 lines
3.7 KiB
Plaintext
m days (as ll doc), ls Ilkely In produce svvcm loal
|
||
sending, and mu Inc rnllsl bl- kL-p‘ well ln mlrld when
|
||
salllmrms are llxelnd ur bulk ms flaxhflood law
|
||
bxvnws rrllreal wnen smlemenls are WV" ln wadls, on
|
||
are upalleam slde ol reslrleled gaps ln nllls, or ln
|
||
nullaws near dl-y waeelenulses ll we are an slum pr use
|
||
the lnlerlse, sudden and min-gum! lalls in deserve, we
|
||
need nyerslre ellarlnels, drdms, lnllllra. 'rm, and
|
||
dlyerslon syslems lll ellpe with snen hlgh enslly
|
||
swans
|
||
|
||
ln Anslmlla, saw lly rainfall runs on or ls elapul-nled
|
||
[mm land and waler surlan's ouler nln deserls would
|
||
have similar losses, wlln only m ul relnlnll avallable
|
||
m plants Nonml esllmales are 0! ml wdrnr mull
|
||
lnr luresled rreus. 207a lur nunelolesled seeds wl|h
|
||
nudy ur lrlahle sulls, and up lu m lor me {are
|
||
eumeled, mmpaclcd, ur day~5eliled bare slles These
|
||
lew figun-S enable us In make edusaled guesses as lu
|
||
lne ydlumn ul runelll warn and llenee lnr eapaeny
|
||
needed in ellannels 0v lluud by~pa§us m any and area,
|
||
or“: ealllrulle flood levels in valleys
|
||
|
||
sllme pmipxuriun lnlerlsny lrsnles lmlnm hmlfl)
|
||
are llsled m Table m.
|
||
|
||
G en snrn dnlly- rdmlall lnlenslll ,th ale lne
|
||
rypleal pmpllrllllns lpereennsgesl ul mum“ we can
|
||
erpeel [mm l-arllllls sllbslmlasv ll ls (kw pereenlalee ul
|
||
runeull lllal WI“ deeldl- rne prupulllun M rlrlrages
|
||
needed ln . d mas (as sull ur swalr sllarage, plls,
|
||
dams, ur elslernsl We pnsumr d ralny perleld m m
|
||
null/day, 59¢sz]: m mm dala relers re and landsl
|
||
|
||
As well as snrluee nmdlhm’ls, ulller Vaflnrs alleel
|
||
Water runarll. 50m lrrlpllrlanl dl-lermlnunls are
|
||
|
||
- CATCHMENY 5le small mKhml'MS dlsrhirge a
|
||
grakr peak lluud now lllan hrgc ealellnlrnls Fmflull
|
||
areas will peak lu floods mule rapidly man plams
|
||
|
||
. STREAM GRADIENT. Sleep slleanls dlsrllarge
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
mun: rapldly lllarl duwnslleam 1m; nl gem]: grade
|
||
ml This ls relaxed ls llle lame above, as llle smaller
|
||
neadwaler sneams are, ln [lit usually sleeper man we
|
||
larger slrearlls ln rlle plalns, wluell are onen sande
|
||
cloggzd and llaye wlde llmd plains
|
||
|
||
. 5le or slow Large slums rnaly lually wn a
|
||
small ealellmenl, eauslnr l/xal floods, whmu ale same
|
||
slurrn will llave lime duwnsneam elleel || ls slam-nun,
|
||
ln desens ur and anus, la see a llpud dlsappulr a lew
|
||
kllumelres [mm m neadwalels lx-crpl in (M use or
|
||
vuy wldesplead rams.
|
||
|
||
- STORAGE AND RETARDATION usle Dams,
|
||
relenllorl pr lnleleepllun lrsnlls, swules, nalnral
|
||
swamps, and eruled swamps all .ednee ur dzhy flood
|
||
peak Laul soll appeal-pm ls much more elllelenr in
|
||
small slreams a! my. denslly, lull large mellmenls
|
||
naye gleam dampenlnr upldly [or lluods, pluwdlng
|
||
such leraldarlon areas ale preserved ml suen purposes
|
||
as flood comm! lmany cl lnese areas are dlamed, filled.
|
||
urulllll upon)
|
||
|
||
- CMCHMEN‘I mm. The normal dendnur lute
|
||
lllael drainage panerns lax rivers, where prarlenes pill ll
|
||
small angles, are supyeel nl lasler flooding lgrealsr
|
||
shnmnning) lllsn lelld-ulannmln or null—area gnd
|
||
uldamenls Wld‘ lllelr abrupx (unu, ennsumed vilkys,
|
||
and relanyely lungruni nlnuddle-ardel suearns
|
||
|
||
. DRA|NAGE DENSITY mle actual kngm nl mm
|
||
per squm llllurnme) Very dense “landfill: lame
|
||
watu vuy elllclenlly, and ereale lllyler and lasler "and
|
||
peaks sneer lluw aeruss rlle llal inluvfluves lsr on
|
||
slopes ln luwedenslly areas relalds noodewalers, as
|
||
dues lne bnldcd and bmad screams ol lla- duel areas.
|
||
|
||
. VEGEYATION Kunvfl Inmasl'é as vegelalrlln ls
|
||
eleared the less (mwn lnlereepllun, llnnlus slurage,
|
||
and glmmd lrllerlelenee emullnlered by l-alru llle male
|
||
water runs wif ll lllssoek grass wplxs sluulss ml dry
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
HllfllIE 11.34
|
||
|
||
SNJ m uunswe wnta
|
||
|
||
wan-l lmn mm mm m w saw. an m null. and mum“
|
||
should be med dase lrr mun ln m um lean-us oi amid [ans
|
||
|
||
Feesn wares mMT-x
|
||
|
||
Huv fl
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
,yn 1am Dwflifls
|
||
we
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
a»...
|
||
|
||
|
||
|
||
|
||
|
||
343
|
||
|