a) Site one (Bekhal River): Located southwest of Soran district about 8 kilometres (Km) far from its center. The marginal vegetation consists of few trees. The riverbed consists predominantly of sand and stones. Water depth is about 1 meter (m) and width about 11 m. Human activity here includes tourism. b) Site two (Zar Gali stream): Located northeast of Khalifan sub-district about 4.5 Km far from its center and 2 Km far from site one. The marginal vegetation consists of few trees, emergent vegetation and submerged vegetation. The riverbed consists predominantly of sand and stones. Mean water depth is about 0.5 m and width about 5 m. Main human activity included tourism. c) Site three (Khalan River): Located in the center of Khalan village which is about 15.5 Km far from Soran center. It’s form from the junction of Zar Gali stream and Bekhal River. The marginal vegetation consists of few trees. The riverbed consists predominantly sand and stones. Average water depth is more than 1 meter (m) and width about 14 m. Human activity here includes drinking, irrigation, fishing and mining. B. Sample Collection and Analysis Benthic macroinvertebrates' samples collected at three sites during periods extended from April to November 2014 at monthly intervals, sample collected at each site by collecting the rocks by using Surber sampler. The benthic invertebrate were isolated to the main taxonomic group, and preserved in vials with 4% formalin. Taxonomic identification of most samples was made to the generic level and some members to the species level through the taxonomic key of [14, 15, 16, 17, 18 and 19]. C. Indices: a. Shannon-Wiener Diversity Index (H) Used by the [20], the Shannon-Wiener Diversity index (H) is commonly used to calculate aquatic and terrestrial biodiversity. This index was calculated as