---
title: "Example Data Values | Water Quality "
slug: "example-data-values"
description: "View the example data values for the water quality solver. "
tags: ["1D river modelling"]
updated: 2022-11-01T16:29:32Z
published: 2022-11-01T16:29:32Z
canonical: "help.floodmodeller.com/example-data-values"
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.

# Example Data Values

This section lists example data values (where zero value are acceptable they are not necessarily listed).

| **PARAMETER** | **Example data values** |
| --- | --- |
| **Diffusion** |  |  |
| Form of coefficient |  | Constant |
| Value |  | 10 (or 0 if no diffusion) |
| **Coliforms** |  |  |
| Boundary/source values |  | Any values, eg 10 |
| Day-time T90: |  | 10 |
| Night-time T90 |  | 50 |
| **Decaying Pollutants** |  |  |
| Boundary/source values |  | Any values, eg 100 |
| Day-time decay rate |  | 0.2 |
| Night-time decay rate |  | 0.2 |
| **Salt** |  |  |
| Mode |  | Constant |
| Value |  | 10 |
| **Conservative Pollutant** |  |  |
| Boundary or source values |  | Any values, eg 1000 |
| **Temperature** |  |  |
| Mode |  | Constant |
| Value |  | 20 |
| **Dissolved Oxygen** |  |  |
| Reaeration | Reaeration coefficient | 0.04 |
|  | Temperature factor | 16 |
| BOD5 | Rate constant | 0.23 |
|  | Temperature coef | 4.7 |
| Slow/fast decay | 0.2 |
| Organic nitrogen | Rate constant | 0.23 |
|  | Temperature coef | 4.7 |
| Slow/fast decay | 0.2 |
| Ammonia oxidation | Rate constant | 0.26 |
|  | Temperature coef | 4.7 |
| Slow/fast decay | 0.2 |
| Nitrite-n to nitrate-n | Rate constant | 1 |
|  | Temperature coef | 5 |
| **Sediment** |  |  |
| Boundary or source values |  | 100 |
| Critical deposition stress |  | 0.1 |
| Fluffy bed | Critical erosion stress | 0.2 |
|  | Max. thickness | 3 |
| Dry density | 75 |
| Consolidated mud | Critical erosion stress | 0.3 |
|  | Max. thickness | 0.001 |
| Dry density | 300 |
| Settling velocity, fresh water |  | 0.1 |
| Settling velocity, saline water |  | 0.5 |
| **Phytoplankton** |  |  |
| Half saturation constant | nitrate-n | 0.1 |
|  | orthophosphate | 0.014 |
| silicate | 0 |
| Nitrogen to carbon |  | 0.16 |
| Phosphorus to carbon |  | 0.024 |
| Silicon to carbon |  | 0.01 |
| Maximum productivity | Gradient below Tc | 0.017 |
|  | Intercept below Tc | -0.025 |
| Gradient above Tc | 0.037 |
| Intercept above Tc | -1.564 |
| Tcrit | 25 |
| Solar radiation | 100 |
| Light extinction |  | 0.85 |
| Respiration |  | 0.02 |
| Q10 |  | 2.2 |
| Mortality rate constant |  | 0.1 |
| Detrital carbon | Decay constant | 0.046 |
|  | Temperature factor | 4.7 |
| Settling velocity | 0.001 |
| **Solar Radiation** |  |  |
| Mode |  | Constant |
| Value |  | 100 |
| **Adsorbed Phosphorous** |  |  |
| Adsorption rate constant |  | 25 |
| Temperature factor |  | 0 |
| Orthophosphate/mud ratio |  | 0.05 |
| Half-saturation constant |  | 0.5 |
| **Benthic Algae** |  |  |
| Half saturation constant | nitrate-n | 0.1 |
|  | orthophosphate | 0.014 |
| silicate | 0 |
| Nitrogen to carbon |  | 0.16 |
| Phosphorus to carbon |  | 0.024 |
| Silicon to carbon |  | 0 |
| Solar radiation |  | 100 |
| Respiration |  | 0.02 |
| Q10 |  | 2.2 |
| Mortality rate constant |  | 0.2 |
| **Macrophytes** |  |  |
| Half saturation constant | nitrogen | 0.1 |
|  | orthophosphate | 0.014 |
| silicate | 0 |
| Nitrogen to carbon |  | 0.16 |
| Phosphorus to carbon |  | 0.024 |
| Silicon to carbon |  | 0 |
| Productivity rate |  | 0.5 |
| Q10 |  | 2.2 |
| Solar radiation |  | 100 |
| Proportion lost by | Leaching | 0.1 |
|  | Exudation | 0.1 |
| Seed concentration | 0 |
| Mortality rate constant |  | 0.05 |
| **pH** |  |  |
| Boundary or Source value |  | 7 |