PERMFILE128204

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: VOLUME 8 - FLOOD DESIGNS
• Media Type: D
• Archive: No

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TARLE $.~om ylLte non of rein lafl inc rrment~
COllr l•TATIO:: OF STATIO\ K'E IOHTS
Fluuon It r.n:.,'.I o. er I rcrrr.; cl Cvln ~ l1 e:cSll el st>:bn u'e.;Ct. rot C, r Lo: 'l:
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..•al r;r rai^`all incremcr.ts determined as the
.,:~'r:1•r o•:er the bas;n. Various retention
'~'- :u•a a>sumcd ur.ti] the total of the com-
ur 1? rain.`;:': c~cess equals the measured storm
•"~:i. .-t r. c?::.mple of this procedure is Fi,:cn
. •.:.i,!•t ~. ]t the concct re;u.^.:ion rate has
I:L••'n ..=s:m:ed :;,ter t\co trial:, a .air,iall
' ~ •"rrt\•r.;ien cnnv \': ill facilitate the se!u-
'•I.. :r. ;i7c c~:;^;nir of table 4. the cl:rce
' •irl I~,• 1;; ;:15';t tcroul;h the t\\u points rcprc-
' 1i:•'11 11:• ti:" coord:n::tc.c p.?5• 1.~, and 0.15.
_ ~ Ti:c correct rruntton rac correspond-
. ,~ 1 rain!.::! ~'xec+< of''.O inches \•:ould tht'n
,. ,1 r• from ;his c:;nc.
'J ill' liur..u1':: umc c( c?.cc;. rainfall is that
"1" 1:::rlnr \' I;ich raln;all Inn'c:.^•c:ri< c':cci'tl
' •'•.or.1~c rctcntiol: ra;c. fn the third tr::I.
...'. !. lS. L!u:':ltiun Lmc is :? bout's.
1, r /i.anar:hnq Drrrrt f'anuri lrq n{ Soil Qrt ~'
"' ~''Ir11 -Thr problem mo>t often cn-
countered in flood studies is the need for es-
timating runo^.' front a \eatershed fer \ehich
there arc no records of runoff or prce.pi:atio:l.
A n approach to soltaion e' this proL!en: is to
comp:: re runoff' charactcristu'< of the v:r:^'-
shed under stud}' \'•Ith tho>~ of n'a:ershrd~ fer
\chich records arc a\'ai!able. Pain charactcn
istics \••!:ich map be mop: readil}' contparcci i
es:ir^ah n~ the \'o!ur.:c of r::.^.o:!' that «'i!I re,u~;
from a ~icen amount of rain`all a:'c soil t;:pL'
tout cuter, v:i::ch includes land usa,:r. tThr
dt<:ributton of the runo!f, i.e., the unit;rrap't, ;<
comparrd on the ba=i. of ar\•a, c•h;:nrr: c!::u-
ac;eris:ics, ete.l Ubr:ousl~, a !.;teat dea; of
icd~:ncla must be used rn maL:n;- such cen;-
pari>on< bccaa.c u` the prrlt numLrr oC moil
t 5';~c> ;: r. t! c•v: cr' i;'pc< :ulrl ;hr m:u:r L•orn4ir.a-
tiuue thereof pos=iLlc \•:Ithla :L ~pcclfic \\atrr-
shcJ. 11one\'cr, nc:u minrnr,lrrt to>< rate: :1rc
a':: uri:ltrd \crih intloo dL•,I~n liuud> ~ lhcrrfurc.