The isobars map (local base-level map) represents the erosional stages and it gives a strong relationship between different Strahler order streams and the local topography. This approach is quick, efficient and reliable to delineate neotectonic influence within the same rock types. In this research we evaluate the geomorphic landforms of Potwar Plateau and Kalabagh fault zone using local base level approach. The purpose is to demarcate boundaries and to see whether they are influenced by the active tectonics or lithologic difference. For this purpose we extracted the drainage network from SRTM 90m DEM in the form of second and third Strahler orders. The isobase map was constructed based on intersection of contours from the DEM and their intersection with the selected stream orders. We observed different base-level anomalies that relate with the prominent neotectonic features and lithological boundaries as presented in the published geological maps. The orientation of the isobase lines correspond well with the local and regional structures in the study area.

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