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<br />'~?<':c:.~'::~'!~' "these'reservo1rsmust be provided..Inflow water quality, nutr1ent',' <:;,.:,:~:,;,
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<br />,,"~",,:," ,.',"'''''1 oad1 ngs ,.:operat1ng procedures, 'water and nutr1ent res1 dent time, ','~:, ",""::": ,:::"
<br />~';, >X<:';::',:.:"...'nu1sance ,aquat1cplants ,colltrol rr.ethods~ lake hydrology"andrnorphology,':,,::-::,
<br />;'i ',-",;,":"::i,:."b1ot1c cOr:JT.un1t1es present,'etc;1s .the type of data that is needed..':"" ""co.,;,
<br />,f, ,:,,':..,::,:-:.:.... Hlthout'.this'infonnation thecor.lpar1sons made are 1~1thout mer1t.' In~':,::::~;."
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<br />:'i ~~:,,:.,"~:,/:;..:>',fonnation regarding thetrophfc status of the South Platte Rfver can. ',:";'<':,";
<br />\:1, ",,';::',,_ ..'..',:,;.':.,':,1n no way be used to demonstrate the eutrophf catfon potential of the, ,,"::', ',:<:
<br />;,~?:.~::,::,:;::::':~~:'propose~ NarrowsRe~ervofr'.sincethey.ar:'e. tl-IO enti~ely dif;feren~:.:~,.,:'~i.;,:.</:
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<br />~:::':~::,'>\'~Z~i:::'~~ -<';"3}:,The average. depth of the reservoir (apparently varyfng :~;.:,:;::.;:)/"i(,
<br />~>i)::::;,'i~,\J':~;betVleen; 14 c feet and 32 .'feet depending on, thedraI1do~n) f s quf te.;;~,':k";'E';;':
<br />:.'...'.,...,;."'..}(,.\ 'shallow,and vertical stratification could be fnsignlffcant 'or non- '., <..' ,',.,......
<br />S~~~;">;;.:ly':.'existent. ',This woul d makenutri entsmore avaflabl efor algae' and:"':;,'.::/,\,"
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<br />:~ 'f:;:Y~~'.":.::',,.,.:....><, 4)' '~Jhat. are the average nutrient resfdent times, .both ,for the,,: .-:" j<.";' .
<br />,;-. 3{:",..",:,:;~:"':entfre reservofr and the littoral zone? ,Wfll nutrients, especi.ally" '.: > <:: '-
<br />:r; "i;:~.,:~,::,,:<:":c.'-.:total phosphorous, 'accumulate)n the littoral sedfments?, What 1s'":~.-,,.Y".,}i; ":
<br />~: ::':'::,:",..>.,'.<the expected growth potentfal'of higher ,aquatfc vascular plants in ':::."':":'~:'~
<br />:'::' : ,':: " the littoral zone? (Sfnce the nutrients in the littoral zone should :' ::~~;~
<br />.' :'.:' ',':':, -:..':, .."have a longer resfdent time than those of the reservoir in toto,'a greater,' t:
<br />, "~>.:' '.': .. potential for excessive aquatfc plant growth ex1sts in tnese areas. ',,:..,~.
<br />,;-~:~<:,,~~.:,,: ;Therefore, recreational impafrment may result in the ~ft~oral zo.~e ',>;':,: '~i-'
<br />,~, .: ~<:':"','.:,' ' sooner than fn the other areas.) "', '.,'.:. ',: '.' ,~::' ;:'..-..,,' ,-:.; .
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<br />:>' ':::~,,:';','<::';~>:'~,; 5), :In order to make a ,more considered judgement of the potential'.;:, ~'",. ~
<br />~ .,..',.;'f.'->.::,;:severity of eutrophication, amass nutrient'balance (takfng into'ac- ','.::,':1':;
<br />'t,-;'.".], :;,;;:.:,.,,:::...,'count'all fnputs,rescrvofr retention time, 'etc.) should be done whfch.., ,;,'.~f;::
<br />")"~:",:'<;>'::~<:~':":o'could:lead to estimates of the annual rates of accumulatfon or bul1d-,E.::<;:;<.F~
<br />" ;t;y:::,"}(;.:":"up of riutrf ents, particularly phosphorous, in the fmpoundl1'.ent.; For,;'::~,';::: :;::
<br />:;':{">;,:";:">:':':<:,technical assistance in making these determinations the Bureau of. ""::':>:;':''':,
<br />J :',,~(;:>,:,,'\;<:.":;, Reclamation should consult with the staff of the EPA National'Eutro- .:'.,.:.';,<~;:'
<br />.~ :~:;5:~;?;.:::i,'>hf phi cati on Survey f n Corva 11i s ,Oregon ;~Ihf.ch can be a rranged through:....::'::>:~'
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<br />:{:~-:::;;/'~\{;'kf;,;~:;"{6):::~Simfl ar on7stream.pl.ains reservoirs maYPQssf bly, be used ',to':':):i,';::.-'~,;~
<br />',,::,:>:,~.(.~,,1,;.:):::,..'.';:genl!rate :a: sufficient data .basEl ;fromwhi ch..to make:'eutroph1 cation 0'..' ,..:,::,,,".':-:.~.,d-:
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<br />. ::.~~-.:.....-..~",~~-:...'V!.~~' potent a .compar sons:- -_.::"".~...;.-::;:>-..;.....;.;,,: ~ ._.....;....::...--::-...;:,-~..... .:.-~ ..~. -. .~':"..:..~;....r;.r-....<.!:;.~.,.....~n...::.~..~~~~:;~~~":..:
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<br />~':~<:':':.,:::;:::~7:\7):':The resultant dissolved oXYgenproffles fn the ~rnpoundment H,:<.~:,;:-};;~:'
<br />',,~::'~::">.::::::~~,,;,s~o,u~d. be :analyzed. .,The BOD,level of, the SouthPl atte Rl ver fl0l1ing : ~ .::~,~~:;)~,
<br />,'<:':, ';.-.,:'.,.::.-:.:,,:'.: intoth~proposed impoundmenti squfte high. . This fact coupl ed with. e, <. "":5
<br />;'YS:.;.: '-;"~,:'~:;;7reduced atmospheric, reaerati on f s :of concern frpl11 the. standpoint 'of :':':.:i~i:;;..;;.
<br />" ,:i;;.'';.::,:/;::'.,::/?:lowdfssol vedoxygen .levels,'fri the ',impoundmellt.', Thfs'matter. s~olll,d:' ~e:;:;;~::>;~
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