---
title: "How to configure the Dynamic Wave tab to set urban Model Settings"
slug: "how-to-configure-the-dynamic-wave-tab"
description: "Learn how to configure the dynamic wave tab to set urban model settings."
tags: ["1D urban modelling"]
updated: 2022-08-03T10:07:05Z
published: 2022-08-03T10:07:05Z
canonical: "help.floodmodeller.com/how-to-configure-the-dynamic-wave-tab"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.floodmodeller.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to configure the Dynamic Wave tab to set urban Model Settings

In the **Dynamic Wave** tab of the urban Model Settings window, details of certain calculations within Dynamic Wave routing are specified. This tab will rarely need to be used, aside from for the **Variable Timesteps** checkbox, which is particularly important if integrating your urban network with river networks and/or 2D components.

![1DUrbanimagessettingsDWtab.PNG](https://cdn.document360.io/5074bc26-a9ef-4bf4-b1de-a5c6ce628aca/Images/Documentation/1DUrbanimagessettingsDWtab.PNG)

The **Calculation Specifications** are specified here; a user can select a **Force Main Equation** from either the Hazen-Williams or Darcy-Weisbach formulae to compute friction losses for pressurised flow. We refer the reader to the section of the technical reference for further details.

The **Variable Timesteps** checkbox will be checked by default. This needs to be unchecked if integrating your urban network with river networks and/or 2D components.