Dear Sirs,Happy new year 2018!I have a question. Can we simplify the EFDC model to be similar to the Manning shallow water equation where we use the manning coefficient? And how to do it? Is that Z0 in EFDC is similar to “n” values or not? Thank you so much.Regards,Wang

Hi Wang, They can be related to one another but there are several things you need to consider. For example, the bottom drag coefficient Cb in sigma coordinate model is calculated by the formula: Bottom Drag CoefficientBottom drag coefficient and manning’s coefficinet is linked by the following equation:Bottom Drag Coefficient and Manning’s coeffIn the above equation, H is the total water depth. I hope it helps. Best, Janesh Devkota