اقدامات آبخيزداري و نقش آن در كنترل فرسايش و رسوب (مطالعه موردي: حوزه آبخيز سد تهم زنجان)

Taham watershed basin with 161 km2 is located at the km 15 Northwest of Zanjan. In this area, an earth dam with 120 m height, 87 million M3 capacities has been constructed. Beside the study & construction of the dam, watershed management operations have been done since 1996 fixation of forecasted useful life Spam of the dam. Aim of this review is evaluating of the watershed management operations on Taham basin for controlling of erosion & sedimentation. For this, needed data collected & analyzed by SPSS. Results show that, there are significant difference between amounts of sediment & also between annual rainfall & sediment before & after watershed management operations at 1% level.