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WSP07804
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Last modified
1/26/2010 2:28:58 PM
Creation date
10/12/2006 2:37:00 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8272.100.60
Description
Colorado River Basin Salinity Control Forum
Basin
Colorado Mainstem
Water Division
5
Date
10/27/1981
Author
CRBSCF
Title
Supplemental Report on the 1981 Review - Water Quality Standards for Salinity - Colorado River System
Water Supply Pro - Doc Type
Report/Study
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<br />u) <br />W <br />o <br />"'-l <br /> <br />Q f, A 15: In ordr>r for- thc Ins t.O liIore dcfin'itcly cV1l11wt(, <br />'c..:0ii!;-L~(iu-~:;-nc0.~:;, W(~ sU'Jqc~.t thdt the! d.i.~>cussi()n of thi::; issue <br />be expand0c1 to include r~or(~ facts, such as (!st.i.mat:(~s of pCHlk <br />Stil'lCS, flood vclocit.icc>, or damage t.o life a'nc1 1"ro1'"rty <br />including to the tOvln of i~aybelJ.. For example, tche, canyons <br />of the Dinosaur National MonumAnl: could' act both as dams <lnd <br />as .<!ccelEorutors .to the flood \vaves, paoli n9 Uwm in t:he <br />arcas upstream until they rise enough t.O develop enough head <br />to force their way throush the canyons. ')'he !jtaff of <br />Dinosaur National Monument estimates a rapid ri !;e in the <br />canyons of the Monument up to 45 feet, vii th velaci ties in <br />the 30 feet. per second range. Some 300 people could be in <br />those cat'lyons on a given day with IHctle warning tilile. 'I'he <br />s.taff estimates that the flood vlave could be down t.O t.he <br />canyon section from Cross i10untain' in about 3() mi nutes, with <br />grave danger too those camped at Deer Lodge Park aH well as <br />those in the canyon. <br /> <br />In calculating the potential 24-hour steady discharge of 1.3 <br />miU,ion clcre-feet, our estimaLe is that in 24 hours, this <br />'wo~id--be-a sE:c'ady discharge of 670,000 cis. '-Judging by t:he <br />ages of certain trees on the river snores, the Honument <br />staff estimates that t.nere hil.S been no discharge aboVe the <br />25,000 to 30,000 cis level in Lhe last scweral lHmdred <br />. years. W'e ~ccordlngly do not under stann t.he ans\,'er' s <br />'estimate of 800,000 acre-feet as tne ];1i1ximum probable flood <br />which would equal a 24-hour steady discharge of 400,000 <br />cfs. <br /> <br />Q & A 22: Increasing salinity concentxaLions result from <br />1:.\0;0' basic and separable processes: (1). saltc loaqing, by <br />adding new tonnages of salt to Lhe existinS load of the <br />stream'; <<nd (2) salt concentrating, by reducing t.he volume <br />of water whereby the salt load is diluted in i'l smaller <br />volume .of flow. The latter process is a result_ of the use <br />of Compact-related water use, and the salinity impacts of <br />that use are expected to .be offset by the Color.'ldo River <br />.~ater Quality Improvement Program. 'rhat program does not <br />. include any provision for offset.tine) salt loading from any <br />new project.. We suggest. that the sponsors describe any <br />measures that. they propose to mi.nimi.ze new salt loading that <br />could result from project implementation and Lh'lt t:hese <br />measures be described in the EIS. Othenvise, t.his will have <br />to be considered as an unmitigated impact. <br /> <br />The applicant may not be aware that the Department of the <br />Interior has documented occurrcnpes of gypsum dissolution <br /> <br />18 <br />
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