---
title: "Adsorbed Phosphorus Data Fields | Definitions"
slug: "adsorbed-phosphorus-data-fields"
description: "Learn about the data fields and input data required for the water quality model."
tags: ["1D river modelling"]
updated: 2022-08-05T04:58:25Z
published: 2022-08-05T04:58:25Z
canonical: "help.floodmodeller.com/adsorbed-phosphorus-data-fields"
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.

# Adsorbed Phosphorus Data Fields

## Data Input

In order to input the required information for this pollutant into the Water Quality model, the user needs to make sure that the Tab Adsorbed Phosphorous appears in the WQ General Tab (please follow the description on the page [Preparing a Water Quality Datafile](/v1/docs/preparing-a-water-quality-datafile) for this). Then the user needs to select the Tab Adsorded Phosphorous and type in the necessary information for this pollutant in the fields which are shown on this Tab. Alternatively the necessary information for this pollutant can be typed in the .con file opened in a Textpad editor in the datafile format mentioned below.

## Datafile Format

Line 1 ADSORBED PHOSPHORUS

Line 2 phk, alphap, phmax, adlan (4f10.0)

Where:

ADSORBED PHOSPHORUS = keyword

Phk= Adsorption rate at 20C (day-1)

Alphap= temperature dependence factor

Phmax= saturation adsorption ratio of phosphate to mud

adlan= half-saturation constant for Langmuir isotherm (mg/l).

---

Overview [Adsorbed Phosphorus](/v1/docs/adsorbed-phosphorus)