Nutrient budget calculator for Norfolk and Kent
Your Norfolk or Kent nutrient budget in five minutes — catchment, soil, NVZ, rainfall, and treatment works auto-detected from live Natural England, BGS, EA, and Met Office data. Free. Quicker and sharper than the council spreadsheet.
Before you start
This calculator covers new residential, HMO, hotel, and student developments in Norfolk's nutrient neutrality catchments (Wensum SAC, Broads SAC) and Kent's Stodmarsh SAC/SPA/Ramsar. It takes around 5 minutes and produces an indicative budget plus a step-by-step guide to entering the same numbers into the official council workbook your LPA will accept.
Have these to hand for the most accurate result:
Have these to hand for the most accurate result:
- Site postcode — used to detect the catchment, soil, NVZ status, rainfall, and nearest treatment works.
- Site area in hectares — or draw the red-line boundary directly on the map.
- Development size — number of dwellings, plus room counts if you're building HMO, hotel, or student accommodation.
- Current land use — what the site is today (farmland, grazing, brownfield, garden, etc.).
- Sewage destination — mains sewerage (you will need to know which waste water treatment plant you are connecting to) or a private treatment plant.
- For Kent sites only: expected first-occupancy date. Drives which permit regime applies; if unknown, today's date gives the most conservative figure.
Don't have everything? The calculator falls back to evidence-based defaults — your figure is still LPA-grade indicative; just plug the missing detail in for the formal submission.
