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Hello I have created a modified version of an existing 1D Estry/2D Tuflow model. 1D consists of a main channel 1.8km and a 2D covers 1.2 long x 0.5km high (2.5m grid) Instability problems occurs very early in the a 100yr run (generally 20mins). When I look at the error messages, the instabilities do not make sense. For one thing, the instabilities are occuring well away from the flooding extents determined using previous simulations of the existing model. They are also located far away from the 1d channels and their boundaries (about 1.0km away). Attached in a image describes my problems further. Regards, sloan1411 Unstable.bmp