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<br />GENERAL PROCEDURE FOR GAGING STREAMS <br /> <br /> <br />Figure - 7.-Measuring discharge with current meter from <br />bridge over the Hudson River at Poughkupsie/ N.Y. <br /> <br />Detailed descriptions of the procedures used <br />in collecting field data and in t'ornpntillg the <br />disch,u'hre- are g-iyen ill Bt"llson aHc] Dalrymple <br />(1967), Dalt'j'mple and Henson (19(;7), Hod- <br />11lline (W6B), :\Iatthai (I!)(;7) , anll Hulsinl-( <br />(1967), which are book :). chapters .\1-:\5, of <br /> <br />9 <br /> <br />this series, The nse of electronic computers in <br />these computations is eXplained by Anderson <br />and Anderson' and by Somers and Selner.3 <br /> <br />Dilution method <br /> <br />Measurement of discharge by this method <br />depends on determination of the. degree of di- <br />Intion of an added tracer saInt ion by the flowing <br />water. :\ solution of a stable or radioactive <br />chemical is injeeted into the stream as either n <br />constant ratc or all at oncc, The solution be- <br />comes diluted by the disrhal'i!e of the stream, <br />Meastll'rllwnt of the I'ah' of injretioll. the COll- <br />centrntion of the tra!'el' iu the iujected solntion, <br />and the concentration of the tracer at. it cross <br /> <br />~ AlHlf'r~OIl, U. Bo, lUll I .\nd(>r:<lIll. \Y. 1... C'IlIll(lutatiulI lOr <br />wntl'r-Hlrfa('p Jlrotilp~ In "!It'll dIHllIH.h: F.~. Geol. Rnrv<,y <br />'fp('hniflllf'", \Yatr'r-UI':<ourf'{'s Ill\".. 11111'1111. datil. <br />:I SlIlllf'r~, \y, 1'" 1llul Splllf'r, (.. I., ('on1(llltatiotl uf :<tagl" <br />lli:<chal';tp rf'lati"w<hil's lit f"1l1n'l"t:.; ,\wl ('lJllll'lItf'r tl'ehniqlll' <br />1'01' :<1"]>"';\1"'" lll('aSllrl'ml'IIt.~: {',K n..,,1, SIII'"\','.\- T('('hllifJ\le~ <br />\VatN'-HN.;onrcI's In".. IInpnh, ,lilt;!. <br /> <br /> <br />Figure- 8.-VADA (velocity.azimuth-depth-asse:mbly) equipment in use: for measurement from bridge. <br />