---
title: "Scaling and Location of Sections | Technical Reference"
slug: "scaling-and-location-of-sections"
description: "Read about scaling and the location of sections for 1D modelling. "
tags: ["1D river modelling", "1D urban modelling"]
updated: 2022-08-07T16:30:02Z
published: 2022-08-07T16:30:02Z
canonical: "help.floodmodeller.com/scaling-and-location-of-sections"
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.

# Scaling and Location of Sections

Spatial resolution is extremely important for accurate solution of the Saint-Venant equations. In general higher Froude numbers and shallow flows require finer spatial resolution.

Open channel systems are modelled by taking the channel parameters and computing levels and discharges at a set of discrete cross-sections. Each cross-section is separated from the next by a distance Dx. Likewise the solution is carried forward in time by a series of discrete timesteps Dt.

The *rules of thumb* for estimating values for Dx and Dt are different for [Tidal](/v1/docs/tidal-reaches) and [Non-Tidal](/v1/docs/non-tidal-reaches) reaches.