Laserfiche WebLink
<br /> <br />w <br />/'\;I <br />'" <br />-.J <br /> <br /> <br />to the Impe"!"ial Clam. Here the present modified Y average concen_ <br /> <br />tration is 865 lng/I. This increase arises 85 R result of hath <br /> <br />natura) processes and the activities of m~n. Wherever rain falls, <br /> <br />natural solute erosion Occurs. This process enbraces the geocher.lical <br /> <br />reactions that take place as water moves throueh the hydrologic cycle. <br /> <br />The pathways and SOMe of the important r~actions involved in this <br /> <br />cycle arc depicted in Ficure 1. The process has heen active over <br /> <br />geolocic time. Even with the extensive developments by man, the <br /> <br />natural processes are still the principal SOurce of salinity in the <br /> <br />Colorado River. <br /> <br />hoile the r.eochenical processes add a lar~e variety of dissolved <br /> <br />matter to the water, only 10 elements Make up 99 percent or so of <br /> <br />the dissolved constituents. These are hydroflen. sodium. magnesium. <br /> <br />potassium. calcium. silicon. chlorine. OXYflen. carhon, and sulfur. <br /> <br />The elecents OCCur in solution as various ions. 1'101ec1l1es, or radi- <br /> <br />cals. The najor part of the dissolved constituents in the Colorado <br /> <br />River are made up of the cations calcium, magnesium. and sodium, and <br /> <br />the anions sulfate. chloride, and bicarbonate. These. plus minor <br /> <br />amounts of other dissolved constituents, are conmonly referred to as <br /> <br />salinity. <br /> <br />21 Present modified refers to the historic conditions (194J-1968) <br />modified to reflect all upstrenm cxistinr. projects in operation for <br />the full period. <br /> <br /> <br />2 <br /> <br />