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Many of these networks are impacted by the management of the watershed. Reid, (1993) <br />describes these impacts as Cumulative watershed effects or (CWEs). He states "Cumulative <br />watershed effects (CWEs) include any changes that involve watershed processes and are <br />influenced by multiple land-use activities. CWEs do not represent a new type of impact, and <br />almost all land-use impacts can be evaluated as CWEs. The CWE concept is important primarily <br />because it identifies an approach to impact evaluation and mitigation that recognizes multiple <br />influences. The significance of a CWE varies with the type of resource or value impacted and is <br />determined on political, economic, and cultural grounds. In contrast, impact magnitude can be <br />assessed objectively by measuring physical and biological changes. Most CWEs are incremental <br />results of multiple controlling factors; rarely can a single threshold value be identified for <br />provoking a response." <br />Several HCTC_10 watersheds (Figure 5) of the Dolores River System clearly demonstrate that at <br />least two other factors (Saliiuty and Tamarisk) as well as hydrology are having an impact on the <br />lower Dolores River. These factors in conjunction with other land use patterns may also be <br />having an impact on sediment transport and input into the lower Dolores River. These factors can <br />contribute to the formation and migration of the river chamiel and are likely to have a bearing on <br />the available options for success within the lower Dolores River system. <br />N <br />r <br />~~' • ~~ <br />ti °s <br />./ ~~k <br />f "~ ~ :~~.~1 .. <br />Jy d° ~ Y T 4 <br />~ `~rk~ 6~ ,~~~ 140300 ~ LA -'-- ~ ~ .A".ld~fi ~.~ `~~ ° <br />I 1 <br />~ ti !100249 ~- ~ k ~d s~ <br />~ ~ l ~ I ~ ,~,.F~ 140300 2 ~~~5 ~ '+~ ~ ~ <br />~~~~ ~ . ~ $°~ v ~ _ ~~-% !~' '~ I ~ f ~ '~' " ~-„~ {,SIN <br />,` ~~ '~ 40208 <br />~ ~u~f f ' w~ ~ 204< ~~ ~ " ~ ' ~ ~ j~"~r~ <br />M~ ,?~jr a a pry- R <br />~y ~ 4 <br />T~%h~t ~ i `5 ~,Y <br />Figure 5 Map showing Huc_10 level watersheds for the Dolores River <br />Another important aspect of this study will be characterizing the riparian corridor along the <br />entire st<idy area. Fischer, et al. (2001), indicates that "Riparian defiiutions range from simple <br />9 <br />