Modelled non-point-source water pollutant loading rate
Measurement answer
What this metric measures
Reports modelled monthly nitrogen and phosphorus pollutant loading rates from operational non-point sources, using locally developed models and a five-year operational nutrient-load basis.
Specification
Metric specification
- Result format
- Structured table
- Unit
- tonnes of pollutant/month — source-defined reporting unit
- Reporting basis
- Monthly loading rate; model basis uses average nitrogen and phosphorus nutrient loads from the previous five years of operations
- Aggregation
- Reported separately by pollutant
- Pillar
- Environmental
- Topic
- Water pollutant loading
- Controlled domain
- Pollution
- Entity type
- Metric
Reporting boundary
Non-point sources within the operational scope assessed using locally developed models
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- Page 76, Section 3.3, Table 12
- Adopting DisclosureFA.A2.3
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2024
- Requirement
- Recommended
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- Page 76, Section 3.3, Table 12
Value structure
Dimensions and units
- Unit
- tonnes of pollutant/month — source-defined reporting unit
- Reporting basis
- Monthly loading rate; model basis uses average nitrogen and phosphorus nutrient loads from the previous five years of operations
Unit meaning: Values use tonnes of pollutant/month under the disclosed TNFD sector-guidance method, reporting period and boundary.
Table fields and units
- Pollutant
- Loading rate
- Unit
- Reporting month
- Model used
- Operational period used for nutrient-load average
- Non-point-source boundary
Published dimensions
- Pollutant: nitrogen or phosphorus
- Non-point source
- Month
- Locally developed model
- Five-year operational nutrient-load basis
Calculation method
Formula information
- Status
- Specified
- Formula type
- Rate
Formula
Modelled pollutant loading for the reporting month, expressed in tonnes of pollutant per monthApply the source-defined TNFD sector-guidance method within the stated reporting boundary. The candidate specifies a standalone monthly mass-rate outcome, a pollutant dimension, a non-point-source scope, and a required model basis. It is not equivalent to the shortlisted generic pollutant-emissions-to-water table, which does not preserve the specified non-point-source modelling approach, monthly rate, or five-year nutrient-load basis.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
L_p | Modelled pollutant loading rate | Modelled loading rate for pollutant p from covered non-point sources during a reporting month. | tonnes of pollutant/month |
p | Pollutant | Reported nutrient pollutant, including nitrogen or phosphorus as applicable. | not applicable |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 30 August 2026
TNFD additional sector guidance collection
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Locator
- Page 76, Section 3.3, Table 12
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Modelled non-point-source water pollutant loading rate”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: TNFD sector guidance, Final English sector guidance collection through August 2026 (17 documents).
- Locally developed non-point-source model used, including model assumptions and estimation approach.
- Operational and geographic scope of covered non-point sources.
- Pollutant identity and chemical basis for each reported loading rate.
- Five-year operational period used to derive average nitrogen and phosphorus nutrient loads.
- Treatment of missing data, model uncertainty, and changes in model methodology.
Record-specific limitations
- The metric is model-derived for non-point sources and is dependent on the assumptions, coverage, and uncertainty of the locally developed model.
- The supplied evidence identifies nitrogen and phosphorus nutrient loads but does not establish a broader universal pollutant list.
- A monthly loading rate is not directly comparable to total water-discharge volume or to investment-portfolio emissions-to-water intensity.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.