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Question: When running a direct rainfall model using the TUFLOW HPC solver and applying an IL/CL using the materials layer, the results in the RFML map output are showing that the losses continue to accumulate after the rainfall has stopped i.e. for a 1 hour storm event, the cumulative loss continues to increase after the model time has passed the 1 hour mark. Is the model working, and am I able to use the other output results? Answer: Yes, the model is working and you can still use TUFLOW HPC to model direct rainfall with IL/CL applied using the materials layer. There is a bug in TUFLOW build 2017-09-AC in the RFML map output when running with the HPC solver that continues to report rainfall loss after the rainfall has ceased. This bug is confined to this map output only and does not affect the hydraulic computations or other outputs (depth, velocity, hazard etc). Please do not use the RFML output when using the HPC solver in TUFLOW build 2017-09-AC or earlier. This is not an issue when using the Classic solver.