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This paper evaluates the suitability of using some flood plain deposit between Samara and Tikrit as impervious blanket to prevent the leakage of water. The scope of work includes: engineering geological evaluation of the study area, picking and testing samples and the final decision to accept or reject the sampled area according to well-known standards. Introduction The economical aspect was behind this study. Extracting, powdering, mixing and moisten the crude material near the outcrop area, besides the in-situ testing, cost a lot money especially when the outcrop area is far from project area, as it was. On the contrary the flood plain deposits don’t need the former activities except digging and testing the material and thus, it has relatively low cost. The sampled area is located within the Upper Mesopotamian Zone of the Unstable Shelf Area according to Buday and Jassim, (1987). It is located (13) Km. NW of Samarra city, near Baghdad-Mosul highway, within Tigris River flood plain deposit, (Figure 1A & 1B) Generally Tigris flood plain forms narrow strip along Tigris River otherwise the vast area surrounding Tigris River between Baiji and Samarra area falls within Al-Fatha alluvial fan, Jassim, 1979. The flood plain deposit consists of coarse and fine clastics i.e. sand, silt and clay but the near by area toward the course of the river is covered by coarse sand and gravel on the surface. Barwary and Slewa, 1991 distinguished, in addition to the mentioned units, slope sediments and valley and depression fill deposits, (Figure 1B). Field observation shows that Al-Fatha alluvial fan consists, depth wise, of 0.5-3.0 meters of high gypsiferous fine clastics, maximally reaches 5.0 meters in some localities, mantled by scattered gravel on the surface. The mentioned fine clastics is followed by conglomerate of variable thickness, (315) meters thick, composed of igneous and sedimentary grains of coarse sand, granule and cobbles. It is packed by sand and gypsiferous fine clastics as cementing material. In some domestic water wells the Miocene and Pliocene sediments (Injana and Mukdadiya Formations) are exposed at the base.

Suitability of Some Tigris Flood Plain Deposits as Impervious Fill Type "A" Class CL for Lining