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<br /> <br />.. "(1 'J ~.''"! ~ <br />,(.. _ '"'....:J <br /> <br />,-..' <br /> <br />; .' <br /> <br />r-.t' <br />.. ;.:\ <br />. .!,. ' <br />,"",':1 - <br />,. . <br />" <br /> <br />. <br /> <br />. <br /> <br />These are the larger (sand, grovel, cobble) size particles that are <br />moved in this way. No data is available to quantify this movement, <br />but in genera 1, ma teri a 1 is moved by hi gh fl ows in the steep stream <br />reaches and deposited in pools or gentle reaches. Such movement of <br />the channel materials is typical of streams located on hard, precambrian <br />bed rocks - particularly where glaciation has eroded the material to <br />small sizes capable of being moved. Because of its relatively gentle <br />gradient and good stability, movement of channel materials is not <br />excessive in the Upper Encampment. (see report, Encampment River <br />Stream Description and Stabi lity Analysis.) <br /> <br />The report referenced in the previous paragraph also identifies two <br />critical areas for sediment production on the Upper Encampment <br />(Colorado portion). The first is on the Main Fork just above its <br />confluence with the West Fork. There raw banks from a few feet <br />hi gh to 50 feet hi gh a re found adj acent to the stream. High fl ows are <br />likely to undercut these banks, causing mass wasting and resulting <br />sedimentation. The second critical area is found on the West Fork, <br />just above West Fork Meadows. Extensive deposits of sand and gravel <br />have accumulated behind debris dams which are comprised of relatively <br />small material. Abnormally high flows could dislodge these debris <br />dams, releasing the deposited material into the stream. <br /> <br />IV. CHEI~ICAL PARAMETERS <br /> <br />a. .P.'.! <br /> <br />I <br />pH is a measure of hydrogen-ion concentration and is used as an indicator <br />of acidity and/or alkalinity of the water. A value of 7.0 is neutral. <br />The existing data, althbugh somewhat variable, ranges from about 6.5 <br />to 8.0. These values, some of ~Ihich ore of somewhat questionable <br />accuracy, indicate that the pH of these waters is well within acceptable <br />standards; (see Table 2). <br /> <br />b. Specific Conductance - J2ta.l ~issolved Solids (TDS) <br /> <br />In natural waters, the dissolved solids consist mainly of carbonates, <br />bicarbonates, chlorides, sulfates, phosphates, and nitrates of calcium, <br />magnesium, sodium, potassium; with traces of iron, manganese and other <br />substances. Since all these ions are difficult to measure, the con- <br />ductivity (specific conductance) can be used as a simple indication of <br />total dissolved sol ids level" <br /> <br />, . ':r ~.'.-'..: \:\ (: <br /> <br /> <br />.,' ... <br /> <br />,.,1 <br />