---
title: "Theoretical Basis | Technical Reference"
slug: "theoretical-basis-theoretical-basis"
description: "Find the theoretical basis to 1D modelling."
tags: ["1D river modelling", "1D urban modelling"]
updated: 2022-08-07T15:47:17Z
published: 2022-08-07T15:47:17Z
canonical: "help.floodmodeller.com/theoretical-basis-theoretical-basis"
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.

# Theoretical Basis

River modelling involves the interaction of the channel and external and internal controls, taking into account the requirement that the mass and momentum of the body of water should be conserved.