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APPLICATION OF HYDROLOG

PRINCIPLES IN STORM SEWA

DAREN GUMISA

CE 552 WASTEWATER ENGINEERING

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STORM SEWER

simply a drainor drain systemis des

!o drai e"#ess rai ad gro$d %a!er &rom

s!ree!s( par)ig lo!s( side%al)s( ad roo&s*

T+ey are &ed ,y s!ree! g$!!ers o mos! mo!or%ays( &re

ad o!+er ,$sy roads( as %ell as !o%s i areas

e"perie#e +ea'y rai&all( -oodig ad #oas!al !o%s

e"perie#e reg$lar s!orms*

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./DO0OGIC C/C0E

T+e water cyce( also )o% as !+e !ydr""#ic cy

!+e H$O cyce( des#ri,es !+e #o!i$o$s mo'eme! o&

o( a,o'e ad ,elo% !+e s$r&a#e o& !+e Ear!+*

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T/1ICA0 STORM SEWAGE S/TEM

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A##ordig !o Di'isio o& Se%erage ad DraiDepar!me! o& 1$,li# U!ili!ies( Ci!y o& Col$m

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Rati"na Met!"d

T+e rati"na met!"d s+all ,e $sed !o es!ima!e r

draiage areas smaller than 200 acres* I!s $

limi!ed !o !+e e'al$a!io ad desig o& s!orm se%e

small ope #+aels( s%ales( roadside di!#+es( o'e

s+allo% #o#e!ra!ed -o%( road%ay #$r,s( ad s!ile!s* Desig dis#+arge( 34 is o,!aied &rom !+e e6

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%& Rati"na Met!"d

' ( )CIA%+ere7' 8 Dis#+arge i #$,i# &ee! per se#odC8 Coe9#ie! o& r$o) 8 C 'al$e #orre#!io &a#!or &or !+e desig s!ormI 8 A'erage rai&all i!esi!y i i#+es per +o$rA8 Draiage area i a#res

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$& T!e NRCS *SCS+ C,r-e N,m.er Met!"

T+e NRCS :SCS; C$r'e N$m,er me!+od( de'

=( par!i!ios !+e !o!al dep!+ o& rai&all i

a,s!ra#!ios( re!e!io( ad ee#!i'e rai&all* T+i

s+all ,e $sed &or areas larger than 200 acres

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T!e NRCS *SCS+ C,r-e N,m.er Met!"d

4 8

w!ere/4 8 r$o dep!+ :i;1 8 rai&all :i;

S 8 po!e!ial ma"im$m re!e!io a&!er r$o ,egis :i;8

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1ea) -o% me!+ods are o! appropria!e &or desigi%a!er de!e!io ,asis( e'al$a!ig do%s!ream imp

s!reams( ad desigig maor #o'eya#es %i!+ draialarger !+a 2?? a#res* I !+ese #ases( !+e Ci!y re6$ire+ydrograp+ ,e de'eloped ad ro$!ed !+ro$g+ !+e sys$ppor! desig ad@or e'al$a!io* I addi!io( +ydrograp+may ,e $sed !o desig o!+er eleme!s o& !+e draiage spar! o& a #ompre+esi'e +ydrologi#@+ydra$li# e'al$a!io s,y #omp$!er models or o!+er appropria!e meas* Desig+ydrograp+ me!+ods s+all ,e a##ep!ed i& !+e res$l!s are pi !+e &orma! deed i !+e Ma$al &or pea) -o% #al#$la!io

ce1ta.e R,n"2 Hydr"#ra1! De-e"1ment Met!

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A $i! +ydrograp+ is !+e +ydrograp+ o& dire#! r$o !+&rom oe i#+ o& e"#ess rai&all geera!ed $i&ormly

%a!ers+ed a! a #os!a! ra!e d$rig a spe#ied !ime* T+ea##ep! !+e SCS dimesioless $i! +ydrograp+ as !+e de'elopig r$o +ydrograp+s* T+is me!+od $ses !+e !a,rig+!( i #o$#!io %i!+ !+e &ollo%ig e6$a!ios( !o de'er$o +ydrograp+ &rom ea#+ #a!#+me! &or ea#+

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%+ere7!p 8 !ime !o pea)( +o$rs

!# 8 !ime o& #o#e!ra!io( +o$rs

4p 8 pea) -o% ra!e &rom oe i#+ o& e"#ess rai&all( #&s1e 8 e"#ess rai&all d$rig !+e

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0&% 3nit Hydr"#ra1!

( t"6 *ts"r td+

!o8

w!ere/!o 8 Time o& o'erlad -o% :+r;(

8 Maigs ro$g+ess #oe9#ie! &or s+ee! -o%0 8 Flo% leg!+ :&!;12 8 2year( 2+o$r rai&all :i;s 8 Slope o& +ydra$li# grade lie :lad slope( &!@&!;

0&%&% O-erand F"w "r S!eet F"w

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0&% 3nit Hydr"#ra1!

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0&% 3nit Hydr"#ra1!

!s or !d8

w!ere/!s 8 Tra'el !ime &or s+allo% #o#e!ra!ed -o% i mi$!es!d 8 Tra'el !ime &or ope #+ael or pipe -o% i mi$!es0 8 Flo% leg!+ i &ee!H 8 Helo#i!y i &ps

0&%&$ Pi1e "r O1en C!anne F"w