ABSTRACT: This study contains RSR. classification of the.rock units of the derivation, tunnel of the Guledar darn..,The main rock, •units on the- tunnel alignmet consist of limestone and the .matrix which have metadetritics and metavolcanics. Support, categories of the derivation fennel (steel rib» concrete and bolt) have been proposed by the RSR values»obtained from, parameters related to the rock classification..