Assessment of Islamshahr Watershed Environmental Reaction by Kinematic Wave Theory in GIS Base

Hydrologic problems are important in urban management. Hydrograph is an efficient tool in this management. In this paper behavior of synthetic and real watershed is studied. In first equations of Kinematic Wave Theory have coded in MATLAB and finally by achieved model in MATLAB and use of GIS, reaction of watershed have assessment. In real watershed state, computed results have compared with a set of laboratory data (Observed Results). Comparison showed accuracy in regression. In second step, Islamshahr Watershed as a real watershed has assessment and by making isochrones, Time-Area curve was result by variety in rainfall intensity