|
<br />.. Nat.raI..... e'-tane1e-CoDttDoed II mn.
<br />. B._.P~ pla1ns (adjacent to utunl*-ml): ::a-p1 .
<br />1. Put\U'e. DO brulh:
<br />=: ~~=:::::::::::::::::::::::::::::~:::::::::: t::::'
<br />2. CulUft&ecl_:
<br />:: i:::~=::::::::::::::::::::::::::::::::: O:oe:5s
<br />I. Hea.,., 1IWcb.lK'::at~ bruIb.nn_m___nuu_o__. 0.05-0.07
<br />4. ~~I:-~h and ~:.~.__.n.._.hm..._.___.h__. 0.05-00.08
<br />b' summer---:" ..._u_...._n__n__n_.___._......._ 0.0&-0,08
<br />5. MedJum to "deaie bruIb: ,
<br />t: :~':;r_-::::::::::::::::::::::::::::::::::::::~:: :::::::1
<br />.. Deld! wllIow'lI..ummer, DOt bent over by CDmIIlL__ 0.1&-0.:10
<br />7. Cleu'ed land with tree stump', 100-150 per Mn:
<br />L Nosproutl",______________."o..o.___nnnnn__ 0.04-0.05
<br />b. WIUi heal" crowtbor.pI'OdU__..________._nm. 0.0&-0.01
<br />II. Beavy stand 01 timber, . few dOwn trMs.l1We UDder-
<br />lI'owvtb:
<br />.. Flooddf'ptb beJowbraoebel.n_nmnmh.....u 0.10-0.12
<br />b. Flood depth reache, brancbeL____hhnm___m O.12-'l1&
<br />C. MaJor stream! (surfsce width at flood stace more than
<br />100 ft.): RoulhneSll coeffie1ent 11 usually.. than for
<br />minor stream! of slmUar desc:rtption on account of IeII
<br />etffd-tve nsIsumce otfered by liTe.uZar banks or ftp-
<br />latton on banks. Values of. may be somewhat reduoed.
<br />Follow recommendation 01 now, 7 tllXlSSlble. The valUl!l
<br />01 71 for larger streams 01 most relular sections, wltb DO
<br />boulden or btusb, may be In the ranpolfrom__._m__n 0.028-0.033
<br />P_~..Tab"2
<br />I Eltlmatea In by Bureau 01 PubUe RolId!I unlea otberwiJe noWd and are
<br />for straight allotment. A smallltlcnue In vallie 01 tI may be m_ for
<br />cbannel allnement otber than stralrht.
<br />I Ranps (or seca. I through III art for aood &0 fair 00DJtruct10n. POI
<br />poor qual1ty con5tructlon, UIIe weer values of..
<br />
<br />Table 3.-Muimum permissible .elecllies lu erodible
<br />channell. based on uairerm 80w in eontinuoull,. wet.
<br />&led ehanllel. I
<br />
<br /> Mu1mum permlsIlbIe
<br /> ft1oclt1el kw'-
<br />M_
<br /> w.... w....
<br /> e... .....4:" -
<br /> ..... --
<br /> .... ......
<br /> - -
<br /> ,.p... '.,... ,.,...
<br />FiDe lIIl1d (noncollolCW>__.___m_____..____ I.' ... ...
<br />81lDdyloam (noneolloidal)_____.._____._.___ 1.7 .. ...
<br />BUt 106m =-coUoid....)..__m________._..__ .. I.. ..
<br />.. ... ..
<br />~~ aab___l~::::::::::::::::::::::::: .. ... ..
<br />~ :':;'tiiii ii>iiOioii.ii::::::::::::::::::: .. u 1.1
<br />1.1 U I..
<br />Graded,loam to oobbles (DoncollolCW)_..__ 1.1 ... U
<br />Or~ sUt toeobbles (colloJdal)___________ U ... ...
<br />AUu sUu ~noncouoJCW)-__-.-----h-..-- .. ... ..
<br />Alluvial sUts ool1oJdal)_______._____________ 1.1 U I..
<br />C08t'Ie p'nel (noo.coUoICW>______h____..__ U ... ...
<br />Cobb.,. and sI:iJn&leL__________..___________ ... ... ...
<br />Sbale8 and bard .-as--------------_________ ... ... ...
<br />
<br />I .AJrecommended by 8pec.fal Committee on In1ptIoo Relelftb, AmerIcu.
<br />80dety of CIv1J EllIineen, 1826, for chmnels w1tb straight aliDemeGt. For
<br />IInuous channels multiply allowable velocity b1 o.~ for Ill,htly ldnUOUl, bJ
<br />0.8 lor modenlel111.nuotlS chumela, IDd by 0 lor h1chlr lIlDaoua chumela
<br />(jI. p. 12S1).
<br />
<br />N
<br />
<br />'I'rfefioIl.Ltauftt ~M#UIlPJpc, bJ'M.J. Websteraad L. R.
<br />Me1alf.. Carps of EDlineen, DepUtment of the Army; publlshed in Journal.
<br />of the Jt1drauUca DIvision, Prooeedlnp 01' the American Boddy of CIvil
<br />EllIioeers. Vol. 85, No. BY 8, September 1_, Paper No. 2148, pp. 15-f7.
<br />f Por Important. work and where accurate determlaatlon of water P'OlUet
<br />II oeoessarr, t.he desl.per II urpd to oonsu1t t.he foIIowiUl rerereDou and to
<br />leleet " by CDmDwtsOD 01' the ~t1c eondltlODJ witb the chmlNlls &esI.ed.
<br />now 0/ WsUr Ca Irritlollon .rId Slmillu 011l1li.., by P. C. Booher, u.s',
<br />Department 01 Al!1culture, Techn1CiU BulWtln No. M2 February 1m
<br />.nm, ofW."'ifI Drol,.. CkftJUll, bJ' C. E. Ramller, u.s. DePMtmen&
<br />oI.Acr1culture, Technleal Bulletin So. 129, November 1m.
<br />I Ra'll4boo! 0/ Chn.7Itl Derign!(If SoIl aM Water COllUrllGtfo1ll, prepared br
<br />tbe Stillwater Outdoor HydrauliC Laborat.orr In cooperation with tbe
<br />Oklahoma Alricultural Erpertment 8t.at1oD, pubUsbedb:r the 80U COIl-
<br />lIefvatlon Service... U.B. Dep.:art.ment. 01 AlricuJt.ute, Publ. No. SC&-TP.Q.
<br />Much 1857, rev..IW1e 1866.
<br />. Flf1fI 0/ WCIk!r ift CTl4.u, p,rbdfd &, V.,.,.., Lifti.", by W. 0, Ree
<br />and V.I. Palmer, DI'risI.on of Draln&(t and Water Control. Research, SoU
<br />ConaervaU.on Ser't1ce, U.s. Department 01 Acrteulture. Tecb. Bull. No. 867,
<br />February INt.
<br />, For Calculations 01 stap or diJebarre In Datural stream channels, it II
<br />~mended that tbe deslrner consult the local District. Otftoe of the
<br />8urface Water Branch oUbe U .8, GeoIOllcal Survey, to obtain data rerardlne
<br />values of tJ applicable to ItrearDl!l of any specifIc locaUty. Where this pr0-
<br />cedure is not followed, too table may be used as a IUIde. The values of
<br />. tabulated have been dertftd from data reponed by C. g, Ra~r (lee
<br />Iootnow, ol) and from otber Incomplete data.
<br />I TbeteotaUve values of R cl.ted are prIoclpally derived. from measuremenU
<br />made OD fairly sbott but str~bt reacbes of natmal streams. Where slopes
<br />calculated frOm 1100d elevations alona: . considerable length 01 channel,
<br />involvtn, meanders and bends, are to be uaed In velocity calculations by the
<br />Mann11l1 formula, tbe ""Jue 0 11 tIIUJt be Increued to provide for the addi-
<br />tional loss of enern caUlled by bends. The Incz'ease may be In the ranp of
<br />perbaps a to 15 percent.
<br />I The prelelllle o(follace on trees IiIIld brush under tIood Itace will ma&ertally
<br />illCft8lle tlle value of.. The~fore. rouabness eoel!l.dents tor veaetation in
<br />leal wtIl be larKeI' than for bate branches. For trees in ehanoels or on banks.
<br />and for brush on banlEs where submereence of branches increases witb depth
<br />of low, . will Incnue with r1sin&......
<br />
<br />Table ".-Maximum permissible .elocltie. in ehannel.
<br />liaed with uniform stands .1 "mou. If". coyers. well
<br />maintained I I
<br />
<br /> Maximum permia-
<br /> sible velocity OD-
<br />e.... SIo.. .....
<br /> E........ Eully
<br /> resistant .oded
<br /> - -
<br /> -
<br /> p,,- /"1- f.p.l.
<br /> {Eo::::::::: .
<br />Berm_.......................... 1 .
<br /> I~-.I.~::::: . .
<br />f~~:::::::::::::::::::: 1 .
<br />&-10...._____ . .
<br />Blue ~_..n..h__~.._......~_.___. Over 10..... . I
<br />Grall mistanI______n.h___......_.__.. e-o ....n.... . .
<br />$0-10'________ . I
<br />Lespedeza lericea... ......h____...... h. r..........
<br />~~ng~'I~:::::::::::::::::::::: I.' ..
<br />kudl:u_______hU_..___._...h___..~_._
<br />Alfalfa____....____...____...._______._..
<br />~~r:=ieSi*i8_i:::::::::::::::::::: }H.......... s.. ...
<br />BUdanirall1u__nnu_u..... .__n_.___
<br />
<br />I From HaRdboot 0/ Oaft"" Duip /rIf SoIl allll W. CoIII"NUoII. (See
<br />footooae 5 b.ble 2.)
<br />. U. ftlOCities Oft!' a f.p... onl, when lOOdoonn and proper malntenanoe
<br />CIUl be obtaIDed.
<br />I Do not UIe on Ilopea steeper tbm 10 PIfIeDt.
<br />f Vie on slopes steeper than IS percent fa DOt recommended.,
<br />I Annuall, lPed on mild stopp cr.. temporary JW'Qteet1on QD1tI penIlUItDt
<br />ooven life eet&b1llhed.
<br />
|