|
<br />Aquifer, the stress of low springflow rates on spring-dwelling organisms should be a high
<br />
<br />priority for investigation.
<br />
<br />The IHA should also prove useful in the design of ecological restoration programs;
<br />
<br />For example, on the Roanoke River in North Carolina, dam-altered flow regimes have been
<br />
<br />implicated in various forms of ecosystem degradation, as described previously. Based ()n~tI1~
<br />
<br />IRA results presented in Table 3, restoration hypotheses should be directed atthe ex~"
<br />,;'", .;,-,:,)~:;"..
<br />biotic responses to, increased .frequencies- oUJighcmagnitude flooding, ~uctions' i? ,th~.~"';,,~~ ..,.
<br />. '..;:-,~-::!>s'-"j2l:'.
<br />,"-:", ,::":.,-',',-
<br />frequency of high and low pulses, reductions in the frequency of hydrograph reversal.s ~.' , .,
<br />
<br />rising and falling river periods, and shifts in the annual minimum flows from winter back. to:
<br />:.m",-,' '.'
<br />")' .A-'~. .-',..,.' .'.~
<br />the fall season. Programs to monitor the response to hydrologic restoration could follo1N"# ' '.,: .',',
<br />, ':," "i'- ,. .' - ~ ..,' . -: '-~ -'. -.~-- '~""'-\<':).;;xt.".t~~~~.
<br />strategies: continue to characterize the hydrologic regime using the IHA method, in,?rdlm~;,:;,;~
<br />":d' , , . ." , ,--"',: ':.c' , .__,,,;;Ii~~..,',,
<br />look for an expected decrease in the pre/post deviations in IRA groups; and directly moniforr:." , ,
<br />,~:-<, ',:.. . , ,-.' _;~../'.;'-:_i' ~' -, '". '. .' ~'~if~::~:~~;~tt:.
<br />the status of the targeted biota. Both the hydrologic restoration strategy and the bio.mo?~7 .
<br />
<br />program could be continually refined as we adaptively learn about the biohydrology of the ' ,
<br />'. .~.:m'l1Z
<br />
<br />,
<br />
<br />system.
<br />
<br />:~x~tiW
<br />"
<br />
<br />The utility of the IHA method for' designing hydrologic restoration strategies or for:
<br />
<br />
<br />predicting future hydrologic impacts associated with various water development prop~ ., , , .
<br />'. ~~.~:rp,)/ . ~_~
<br />
<br />be limited unless hydrologic simulation models can be used to create synthesized recoril~;:" :~~: .- .
<br />, " 'JiJl!i~"'"
<br />. _~,"H _ _': _., ~ "
<br />daily streamflow or water table fluctuations under future climate or development scenar~'lt '
<br />
<br />. . '. .' ,", .,' ~ -:".;'" . ,-',"",,':,."'_ ..." .' - '- . . -'.; - '-~'}3~,~-.;;',
<br />potential future hydrologic conditions can be simulated using such models, these future',' :j~.
<br />. " -- ,.'... ". .l-:~~'
<br />
<br />conditions could then be compared with existing conditions (actual hydrologic measu,r~,~ .
<br />"..,__' ,j,. "" ',' '. """.Nl~
<br />or si~ulation of current conditions) using the IHA method. Management decisions coukJ:l\ii'n
<br />)'.:
<br />
<br />25
<br />
<br />
|