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<br />Table 1. Values or Ruaoll' eoemelealJl (C)
<br />for UIe la lbe Rational Melllod
<br />
<br />Tn>eol_
<br />
<br />....a
<br />-,
<br />(C),
<br />
<br />BwolA._
<br />CoDcnte or .beet asphalt paqmeotnn _.__.__...h............
<br />t:::f~.r.=:::::::::::::::::::::::::::::::::
<br />Bare ~h_ nnunU.... nun_.u. _..... un... _. _ onU......
<br />Ew~=:~~I;:-:.:::=::::::::::::::::::::::::::::::::::
<br />Cultivated hlds.. _.. ..",uo... _. _ ._._ .......... ...n.... _. ..0.
<br />UtkBArtOIl
<br />Flat rutdellttal. witb about 10 penu.t or...lmpen'ioul...... 0.<<1
<br />Plat NlideDUal, 'A"lth about eo percent of alU1mpenioul.._.._ O.U
<br />Mockrately steep ruldeDUal, wUh about liD pehl!bt of .,.
<br />Impervious_. _.. .......... ..O_hO........ n_..U _. ....onu_. 0.16
<br />Moderately steep built up area, witb about 70 percent of area
<br />Impervious....._. _._ _....... un _ _ _._.. on..... ono.. ..0..0 _ 0.80
<br />Plat commerdal, With about 10 pefClBIlt olarulmpenious-_u_ 0.80
<br />
<br />O. &-0. e
<br />a......
<br />O.MoS
<br />O. 2-0. II
<br />0.&-0.7
<br />O.]~.4
<br />0.HI.3
<br />0.1-0.4
<br />
<br />I For flat slopes or permeable soU. uae the lower 'Yalues. For MeP 1101* or
<br />tmJllf1DM.ble soil, uae the blBher .alues.
<br />. See reference 12, pp. f8-4g for men detailed dati..
<br />
<br />Table I.-Mannin, Rou,hne.. CoeScienta, n I
<br />_.
<br />I. ao.d ClDDdalla: raDp I
<br />A. COIlCl'ltepJpe_......h.......n_.______._.........._.._ 0.011-4).018
<br />B. Corrugated metal pipe or pipe: ueh;
<br />1. 2* by Ji-1Il. oorruption (rift\ed pipe) I
<br />L PlalDorfullYooat;ed....n._..h.h..h....._..___ o.D'.K
<br />b. Paved invert (nDIt values are for 2& aDd 10 per-
<br />tu.t of clreumrereoce pam);
<br />(1) Flow fun depth__..........._..____........m 0.021..(l.018
<br />(2) FlowO.8dePtb.......mu...mun.......... 0.021-0.016
<br />(I) FlowO..4eptb_._..uwm....__..........m o.01H.013
<br />2. a- by 1.111. oorrupt1oD...._.............nn.....'.._. 0.027
<br />a. &- b)' 2-m. oorrup.tton (1e1d bolted).................. 0.012
<br />t~ E~~r~~~~.::::~~~~~~~~~:::~:~~~~:~~~~~~~ ;;'Ui
<br />O. MonoUthie acmcnte:
<br />i: r~$:.~~~~:::~~~:~::::::::::::::::::::::::: t5g~
<br />B. Cemented rubble mUODJ')' walls;
<br />1. Concrete floor and top.....__...._._.............___. 0.017-0. 022
<br />2. Natal'&] floor. ...n.....__......_............._._..u 0.011-0.025
<br />I. Laminated truted wood __........n........______..0'01&-O.017
<br />J. Vltri6ed. ria,. liner plaw............................... 0.016
<br />D. U.ed open daalUllllt: 4
<br />A. CQDcnt.e. with surfaeeS u Indleated:
<br />1. =~ ftnilh ....____uo.u_........_.n.h..n o.OlJ-G.017
<br />I: Float ftnlsb~:::::::::::::::::::::::::::::::::::::::: tgg::.~:
<br />... Float~nish, IOme If'8velOll boUom ............m.. 0.01&-0.017
<br />a. GunlLe,podaectlon.....__..___.uu_____.__........ 0.011-0.01.
<br />e. Gunlte, wavy IIdton.m.____.......___.......uu.. 0.018-0.022
<br />B. Concrete bottom fto&t.ftnlJbeod, "des u IDdfcUed:
<br />1. DreaIed atone In martar.. .....n.._......_''''U.... 0.016-0.017
<br />t. Random .tontln mortar .._..........___m_....... o.017-o.mo
<br />a. Cement rubble maIOT1I'1........n......m.......... 0.020-0.026
<br />... Cemenl.rDbb1e masonry, plu&ered ..m.._.......__ 0.011-0.020
<br />S. DQ rubble (riprap)_. ............................n. G.oz.cl.oao
<br />C. Gravel bot.tom, deles .,Indlcated.:
<br />1. Formed concrete ..........n__...~U....._...__..__.. 0.017-G.CDO
<br />I. Ran4C11'11 ttone In mortar......~...~....._............ 8.0:II-0.0Q3
<br />I. Dry rubble (rllftp).-....................-----...... o.OIS-O.OI3
<br />D. Brtcll: ...u.u.....~_..__.......~...._.__....__..__.... 8.01t-O.017
<br />
<br />I'ootnot.es 10 Table 2 aflpear Oft p. M.
<br />
<br />0. Uood__~_ M~ .
<br />E. rE~h:::::::::::::::::::::::::::::::::::::::::::::: ~g~~
<br />F. ~~clean.___._....__....______....._........ 0. OJ1.-o. 013
<br />Q. escavMe4 roek:
<br />I. GooclIeeUOD. ~ ...u.n__._._....~......._...___._... 0. 017..(1. D20
<br />2. Inerulw'teetlon..._.._...__..............__..____... o.OZZ-O.lrl7
<br />m. U.........a diu....: t
<br />A. E.....b. uniform leetlon;
<br />1. CMn,l'IIC8IltlYeomPlded......._______....._...____~ 0.016-0.018
<br />2. Clean, atwrwtat.herinc..________...___n............ 0.018-0.020
<br />I. With .hort 1fUS,lew weeds.................______... 0.022-0. 027
<br />... In Ifa'l'ely, 1011. gnifcrm lIC&1on. clean.........._.... 0.022-0.026
<br />B. Earth. fatrI,. uniform IeCtlon:
<br />1. No98letltton...._............__n._hu._h......... 0.022--0.025
<br />2. Grall, IO!De 1nIe4s....._n...uu.............__..... ..025-(1.030
<br />I. DenJe .....dlU.. aquatic plDtslD deepcbamlelB...... 0.010-0.035
<br />... SIdeS.ded, pffi bottom....___.._...........__.... 0.026-0.030
<br />5. Sides, clem. cobble bottom.......____......hh..... 0.010-4).040
<br />C. ~~~~~~:::::::::::::::::::::::::t.=:=
<br />D. Rock;
<br />1. Buedond.eliCDleCltlon...h............m_..._____. 0.036
<br />2. Bued on lICtual mean "ion;
<br />.. Smooth aDd unlIorm........_...__................ O.oas.-G.otO
<br />E. c~~=.weediUid.bniih.WiCu.i~..... O.OtO-a04&
<br />1. DeDIt weeds. blah Ilia. depth..................... 0.01-0.12
<br />2. Clean boUom, brUSh onl1des......_h......h__..... 0.050-0.08
<br />I. CleaD bottom brush OD sides, biCbeSt .. or flow... 0.07-0.11
<br />t. DenIe brush, blab .................__..._..h..... 0.10-0.14
<br />IV. l1li... e"..eII ud..... wttIl ...................... I .
<br />(nluulboWD an tor ve1oeltieaf1l211Dd 6t.pl.):
<br />A. neCz:OowuptoO.7foo1.:
<br />1. .. )(=.r:;-~~!.~.~~~~n. 0.07-0.045
<br />b. ~bftn61Dcbe1.........._._nn.h.....n.... 0....06
<br />'.~~":JWi"~._....._...._._____.......
<br />b, LooItb........ ____.m....................
<br />I. Pm IhIDd, IiDYIfUS:
<br />a. kDItb about 12IDChes........______u...n_h...
<br />b. =~ut"iDCbes..._..h._........h_U......._
<br />B. r.::;:::,:;:!!~~_~I.~,_~.~:u. 0.050-0.015
<br />b.1ADcthf..elnebes....._h..u......u........... o.O&-O.Of
<br />2. ~~~~~..._._........_..__.._..... 0.tH.U7
<br />b. Lenitb abou& ..Inches._.....nd...._........... 0.19-0.10
<br />I. FajrltaDd,.l' crus:
<br />t. ==i~==:::::::::::::::::::::::::::: :.~:=
<br />". ........ ..........., rw:u-a:
<br />:: t.=;=~.~~~~~~~~~~~~~~~~~~~~~::~~~
<br />2. Bouch tenure_ _. .~...n......u....n......n......_
<br />C. CoDcha cut.. with asphalt paftDNlllt:
<br />1. Smooth. ....... ......._........ ,"n.'." ......._....
<br />2. RouCh............._.................................
<br />D. CoDcnte paQlDellt:
<br />1. Float fb:dah.._........._........._.................u
<br />2. Broom flDIIh.................._.............n......_
<br />It. 1'<< CU&"'" wltb 1IID&ll1lope. wbere 1Idlmm& 1D&J ac-
<br />cumulate. mer-. all abon ..m. of. by....___ m u
<br />YI. Nac.ral...... clIP....: J
<br />A.. MIDoJ' streams' (aIrr.ce width at ftood dap Ie-. than
<br />100ft.):
<br />1. FairlyftilUlu'leCtiaD:
<br />a. Some pus IIDd weedJ. Uttle OI"'DO brush........... O.QIIO-O.D35
<br />b.1loDoe"""" 01_. _b 01_...........
<br />IIMtertbaD weed bellh&_._...___............... 0.015-0.015
<br />e. Some weeds, Ucbt bruIIiOft bulks._............... O.OHLOIi
<br />d. Some weeds, beaT}' bn1JhOD baDtl.....___....... 0.0&-0.07
<br />e. Some weeds, d_ wtUoWlOO bllDkl.............. o.D&-D.DB
<br />f. F<< tnIeI wlthtD chulDel. with bnDehes I&lbmIqed
<br />at blah 1tap.1DcreUe au above ....Iuet Q....... 0.01....10
<br />2. Jmrular IecUOQl, wI&h pooll.lliIbt. cbumel m.e.der:
<br />IDcre88e v8'luelln 1 a--e about....................... 0.01-0.02
<br />I. MOUDIaiD stzeamS. DO vcetatiml. b:I cbalme1, buIU
<br />....lIIl.....p......ODd ............_._
<br />81 big' _,
<br />a. Bottom oluavel, ClObblel.1Dd few' boulden.__n__ 0.....06
<br />b. Bottomorcobb18l.'lri.tblupboWden......_..u. O.06-O.fR
<br />
<br />0.11-0. iii
<br />0.10-0. IS
<br />O. If-D. 08
<br />0.2&-0.13
<br />
<br />0.012
<br />0,013
<br />0.016
<br />ao..
<br />0.015
<br />
<br />O.Oli
<br />0.016
<br />
<br />um
<br />
<br />II
<br />
<br />!
<br />
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