Opens NutrientMonkey. Pick The Broads & Wensum SACs from the catchment list and the nutrients lock to match.
Stuck behind a The Broads nutrient condition?
The Norfolk and Suffolk Broads — England’s largest protected wetland — form a dual-nutrient catchment that has held up development across much of Norfolk. Both nitrogen and phosphorus are in scope.
If your site drains to The Broads SAC, the planning authority can't grant permission until you've shown the scheme is nutrient neutral — that it won't add both nutrients to a catchment that's already overloaded. NutrientMonkey gets you the number: build the assessment on screen, watch your budget in kg/year update as you go, and export the planning-ready report when it's right.
Which nutrient applies here
The Broads are assessed for both nitrogen and phosphorus, each of which feeds the algal growth degrading this internationally important wetland. Natural England now runs The Broads and River Wensum through a single combined calculator. That matters, because the methodology and the credits differ by nutrient — and neighbouring catchments often differ. NutrientMonkey flags the The Broads catchment for both nutrients and locks the tool to match, so the assessment is right from the start.
How the The Broads calculator works
- Pick The Broads & Wensum SACs from the catchment list — it's pre-flagged for both nutrients.
- Enter the dwellings & waste water — occupancy, water use (125 or 110 l/p/d plus NE's allowance) and the drainage route (septic, package plant or mains permit).
- Add land use & SuDS — current vs future land cover and any sustainable drainage, with editable export coefficients for the Norfolk & Suffolk catchment values.
- Export when ready — a branded, planning-ready PDF with the budget in kg/year and every input documented.
Honest about what it is
This is a nutrient-methodology assessment built to support your The Broads planning application — fast, clear and ready to discuss with your case officer. The official Natural England catchment calculator remains the statutory tool, and your figures should reproduce in it; the report states this plainly. Want it handled end to end? That's what we're here for.
Frequently asked questions
Which nutrient applies in the The Broads SAC catchment?
The Broads are assessed for both nitrogen and phosphorus, each of which feeds the algal growth degrading this internationally important wetland. Natural England now runs The Broads and River Wensum through a single combined calculator. A compliant scheme has to be neutral for both nutrients. NutrientMonkey locks the nutrient toggle to match the The Broads catchment automatically, so you can't pick the wrong one.
Is the The Broads calculator free to use?
Yes — selecting the catchment, entering your dwellings and watching the budget update in kg/year is completely free. You only pay £79 +VAT (£94.80 inc VAT) to export the planning-ready PDF report.
How is the The Broads nutrient budget worked out?
It follows Natural England's published nutrient-budget methodology — waste water, current and future land use, SuDS, then the final budget with the ×1.2 (20%) precautionary buffer. For new homes the waste-water term does most of the work and is computed exactly.
Is this the official Natural England calculator?
No — it's a fast, planning-support assessment that implements NE's methodology, and the report says so. The official NE catchment calculator remains the statutory tool, and your figures should reproduce in it.
In a different catchment?
NutrientMonkey covers every Natural England catchment.
Or jump to another part of the country:
- Poole Harbour N
- Solent N
- Tees (Teesmouth) N
- Lindisfarne N
- Stodmarsh N & P
- River Wensum N & P
- Chesil & the Fleet N & P
- Hornsea Mere N & P
- Oak Mere N & P
- Rostherne Mere N & P
- West Midlands Mosses N & P
- River Clun N & P
- River Avon (Christchurch) P
- Somerset Levels & Moors P
- River Itchen P
- River Axe P
- River Camel P
- Derwent & Bassenthwaite P
- River Eden P
- River Kent P
- River Lambourn P
- River Lugg P
- River Mease P
- Esthwaite Water P
- Peak District Dales P
- Roman Walls Loughs P
Or go back to the main NutrientMonkey calculator.
Wider planning support
Nutrient neutrality is rarely the only condition on a scheme. Our energy statements service and the wider SAP & compliance team cover the rest of the planning and Building Control picture — get a quote and we'll talk it through.