|
<br />
<br />BASIC STUDIES
<br />
<br /><..")
<br />"'"
<br />'-D
<br />c...t:
<br />
<br />Studies conduc~ed thus far indicate tr~~ there is much variation in
<br />the amount of pickup from ir~igated land. For ~omparison the analyses in
<br />this report are based on values of 'Zero and;: t.ons per acre pickup from
<br />new irrigated land. The r~sults of both analyses are shown in Table
<br />No. 19. It is assumeri tha' no additional pickup ....ill result from the
<br />addition of supplemen'-..el -..:ater '.0 present.ly irrigated lands.
<br />
<br />B. Kev SLat ions
<br />,
<br />
<br />The study period for be 196':\ repor":. 'oIas ;:'rom 191~1 hrough 1958,
<br />inclusive; the pedod for t.he 1965 report '\Jas 'xtended an additional 3
<br />years through 1961, .he 1(j67 report.. includes datu through 1964, and the
<br />present report includes an additional ~ yeaTs through 1966. Bot.h flow
<br />and quali +~y record:.; ar- available for this extended period.
<br />
<br />Qua.l1'y of 'Water and flow records an~ generally available for the
<br />18 stations selected for this ..tudy of the Colorado River Basin. When
<br />record<o were not available, they 'Were developed by ,..:orollary studies
<br />from ....hich data for' he periods of missing records ....ere estimated.
<br />
<br />Figure No. I indi-:-at~s +,he location, and th,- follo....ing descript.ions
<br />summarize records for 'he ~riod of trudy. Figure No, L shows the avail-
<br />able flow and quali t;y record.::: of +~,",e key s~,a 1 iens for the period 1941-66.
<br />Basic records ~sed in 'bis r~port were ~elected from those obtained by
<br />the Geological SUr"vey under a continuing program for collection of water
<br />records. Part of the da+.a collection program is support.ed by funds
<br />transferred by t.r.e BUI"1?aU of Reclamation to the Geological Survey.
<br />
<br />To simplify 'abulation. monthly yalues of flo..... and total dissolved
<br />solids as 5ho....n it) ~..l.bh,., 1 ~o 1-'" hav', teen roundt:j .,0 '.he nearest 1,000
<br />~xcept for concenl.mt iol.1 valUt:F, ThlB r'ounrling r':'sui: cd in 50me differ-
<br />enc~s bet,ween -::he r_'__~orded and 'he c:omputed rr,onlhly~onc",ntra.tions ....hen
<br />+.he flo....s ....ere of~.n D.lo.; 1.000 a'~r"-:~e'2't 'Uld ~he loa,is be 10"" 1,.000
<br />t.ons, For example, in ~he San ?.e.fae.1 and :1uch,--,sne d:'a.ir16ic5 and on '.he
<br />G!'een River neal. Greendale d'.1riDt; '.ne i'illi;l~ of F'la!;li::g Gorge R~servoir,
<br />scrr,e of 'he fla....s a.... Ie .ren 1..C>00 acr.;>-1'1: . p, r ::t:oL-h; h-::nct2'. some
<br />mon~~hly values !' cor,cS';,,1 .':\1 ion sho"",j i:1 ~h'2 '_atlE-s differ f!'o;r. ~_hose
<br />actually re~ord"j be :8",::;. u" 'he :ne'_hud of rou:ldi:le;'. '?imilarly, ~inor
<br />differences :-I'OIll publi;ihec. .la'a i:1 mo,,'hly concen._:.n....,ms occur in iso-
<br />lated ins:ances in 'he 1'10," and q ;,a1i.,y 'abIes for ht: other 5,,a-:..ions,
<br />
<br />A brief r'?sume of '.he soure. and 1:;.," hod of Jer; 'a'ion for each of
<br />+he records of 'he ~:-ation3 "ho;.;n Oil Fig,;r' No. -'" ~mJ. in Tables 1 0 15.
<br />inclusi.:e, 1'0110,",5:
<br />
<br />1. 2ta:ions ~i~h Co~p_e
<br />
<br />Record:::
<br />
<br />t.hc
<br />
<br />Records of flo.... and \HOlter ::p::lll t.
<br />1941-66 period for' !'"Ie Gr<"e:, Ri .ieI'
<br />
<br />~r'-' 3...ai
<br />8.t Gre'"
<br />
<br />lolc :~or nearly all of
<br />RLer, U"ah (Table No,
<br />
<br />5) ;
<br />
|