README FILE
Dataset Title: LAN_TW_TracerHydraulics_2025_v01

GENERAL INFORMATION

Title of Dataset
Langham Treatment Wetland Tracer and Hydraulic Behaviour Dataset (2025)

Date of Data Collection
2025

Location of Data Collection
Langham Treatment Wetland

Keywords
Treatment wetlands, tracer testing, hydraulic behaviour, residence time distribution, RTD, fluorescein tracer, hydraulic retention time, short-circuiting, wetland hydraulics, ecological engineering

Data Collection and Analysis
Ayisha Affo Souleymane
PhD Researcher
School of Water, Energy and Environment
Cranfield University

Collaborating Organisations
Anglian Water
Norfolk Rivers Trust

Supervisory Institution
Cranfield University

Funding Source
This dataset was generated as part of a PhD research project investigating hydraulic behaviour, residence time distribution, and treatment performance in full-scale treatment wetlands.

METHODOLOGICAL INFORMATION

Description of Dataset
This dataset contains tracer test and hydraulic monitoring data collected from the Langham treatment wetland during 2025.

The dataset includes:

* fluorescein tracer concentration measurements,
* residence time distribution data,
* hydraulic behaviour observations,
* and associated hydraulic performance calculations.

The dataset was developed to investigate:

* hydraulic retention behaviour,
* short-circuiting,
* mixing characteristics,
* tracer recovery,
* and hydraulic efficiency within the treatment wetland system.

Description of Data Collection
Tracer monitoring was undertaken using fluorescein dye injection and downstream concentration monitoring.

Tracer concentrations were monitored at designated wetland outlet locations over time following tracer injection.

Measured and calculated variables may include:

* Tracer concentration
* Time after injection
* Residence time distribution
* Cumulative tracer recovery
* Hydraulic retention time
* Hydraulic efficiency
* Breakthrough behaviour

Analytical Methods

Tracer Testing
Fluorescein dye tracer was introduced into the treatment wetland system under operational flow conditions.

Tracer movement through the wetland system was monitored using fluorometric detection methods.

Fluorescence Monitoring
Tracer concentrations were measured using fluorometric instrumentation and associated data logging systems where applicable.

Background fluorescence correction procedures were undertaken prior to analysis.

Residence Time Distribution (RTD) Analysis
Residence time distribution curves were generated using time-series tracer concentration data.

Hydraulic analyses included:

* breakthrough curve analysis,
* RTD derivation,
* cumulative recovery analysis,
* hydraulic retention time estimation,
* and hydraulic efficiency assessment.

Experimental Conditions
Tracer testing was undertaken under operational full-scale wastewater treatment wetland conditions during 2025.

Measurements represent real-world hydraulic conditions within the treatment wetland system.

Quality Assurance / Quality Control (QA/QC)

* Fluorometric instrumentation was calibrated prior to deployment.
* Background fluorescence correction procedures were applied.
* Time-series datasets were checked for consistency and calculation errors.
* Data processing procedures were standardised across analyses.
* Missing values were retained as blank cells where applicable.

SHARING AND ACCESS INFORMATION

License and Restrictions
Dataset generated as part of doctoral research at Cranfield University in collaboration with Anglian Water and Norfolk Rivers Trust.

Users should acknowledge Cranfield University, Anglian Water, and Norfolk Rivers Trust where appropriate.

Associated Publications
This dataset contributes to ongoing PhD research examining hydraulic behaviour, tracer dynamics, and treatment performance in tertiary surface flow treatment wetlands.

Recommended Citation
Souleymane, A. A. (2026). Langham Treatment Wetland Tracer and Hydraulic Behaviour Dataset (2025). Cranfield University.

FILE NAME STRUCTURE AND FORMAT

File Name
LAN_TW_TracerHydraulics_2025_v01.csv

File Structure
Single comma-separated values (CSV) file containing tracer concentration measurements and hydraulic analysis data.

File Format
CSV (Comma-Separated Values)

Date Format
YYYY-MM-DD where applicable.

DATA-SPECIFIC INFORMATION

Dataset Description
The dataset contains tracer concentration measurements and associated hydraulic behaviour calculations collected from the Langham treatment wetland during 2025.

Variable Definitions

Tracer Variables

* Tracer concentration
* Time after injection
* Residence time
* Cumulative tracer recovery
* Hydraulic retention time
* Hydraulic efficiency
* Breakthrough concentration

Hydraulic Variables

* Flow rate
* Sampling time
* Monitoring location
* RTD parameters

Units of Measurement
Tracer concentrations may be reported in µg/L or equivalent fluorescence units. Time measurements are reported in hours unless otherwise stated.

Missing Data Codes
Blank cells indicate unavailable or missing measurements.

Abbreviations

* RTD = Residence Time Distribution
* HRT = Hydraulic Retention Time
* TW = Treatment Wetland

VERSIONING

Version
Version 1.0

Last Updated
2026-05-29

Change Log
Version 1.0 – Initial compilation and documentation of Langham treatment wetland tracer hydraulics dataset.
