Contents preface (VII) introduction 1—37


Alteration of downstream flows



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Alteration of downstream flows












































































Reduction of fish and aquatic




Maintain regulated flows




Full mitigation possible, but

habitat



















































































































frequently not




acceptable














































































































































because of large sacrifice of














































































































































project accomplishments

Reduction of stream flushing




Release occasional flushing flows




Mitigation method not proven to

flows



















































































































be

worthwhile;

Degree of














































































































































environmental effect depends














































































































































upon specific stream situation

Changes of water quality




Selective level reservoir outlets;




Somewhat limited experience









































































water aeration, if needed




with selective level outlets














































































































































indicates good prospects of full







mitigation










Interference with fish and wildlife migrations












































































Blocking anadromous fish runs




Fish hatcheries




Usually capable of full mitigation

Blocking animal







migration




None practical




Importance depends upon the

routes



















































































































specific site





































Landscape appearance

















































































































































Excavation and waste disposal




Project expenditures required to




Satisfactory mitigation usually

sites














































landscape sites




possible without







excessive







expenditure

Reservoir banks below maximum




Minor areas may be developed for




Degree of impact depends upon

waterline














































beaches




the specific reservoir site

Abandoned construction facilities




Construction clean-up




Full







mitigation







possible;














































































































































important only if not done

Erosion scars from construction




Principally by care of drainage




Adverse effects can be reduced

roads



















































































































but not entirely eliminated with







in reasonable cost

Reservoir clearing waste disposal




Controlled burning; marketing




Temporary effect, usually minor,









































































maximum amounts of wood




but not entirely avoidable









































































products




















































































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