River Camel Phosphate Budget Calculator V3.0
    Introduction                            
    Following the Dutch Nitrogen Case which ruled that where a site is failing to achieve condition due to pollution, the potential for a new development to add to the nutrient load is "necessarily limited". Special Areas of Conservation (SAC) sites are internationally important areas defined by the National Planning Policy Framework (NPPF) and given special protection under the European Union's Habitats Directive, which was transposed into UK law by the Habitats and Conservation of Species Regulations 2010. This was updated by the Conservation of Habitats and Species (Amendment)(EU Exit) Regulations 2019. As such, Natural England's view is that any development proposal that adds phosphate into the catchment of internationally important sites, such as the River Camel SAC, is likely to have a significant effect. Proposed developments likely to affect European Sites should be subject to Habitats Regulations Assessment to assess the Likely Significant Affect on the SAC. Application within the Camel catchment will have a Likely Effect and will require an Appropriate Assessment (i.e. the phosphate calculator) to assess the implications of the proposal on the designated site.    
    This tool is designed to quantify the nutrient loading of an area of land subject to a change of land use and population, in order to identify is proposed developments will be 'nutrient neutral'. Where the proposed development will generate additional nutrients into the system, solutions in how to offset the excess nutrients and achieve neutrality are presented.    
       
    This tool is only necessary for proposed developments that have the potential to increase nutrient loading to rivers that flow into the River Camel SAC. Developments that are located outside of the hydrological catchment but will connect to a Wastewater Treatment Works (WwTW) that drains to a river within the catchment should not complete Stages 2 and 3. Alternatively, where a site is located within the hydrological catchment but drains to a WwTWs outside of the catchment then  the development can be screened out of the appropriate assessment but the use of SuDs should still be considered on site.    
    The methodology employed within this tool was, in part, guided by Natural England's advice on nutrient neutrality in relation to the Stodmarsh designated sites (published in November 2020) and the Natural England provided calculator (published March 2022).    
    This tool consists of seven main worksheets:

Stage 1 - Identifies the additional nutrients as a result of changes in the population
Stage 2 - Calculates the nutrient load from current land use
Stage 3 - Calculates the nutrient load from future land uses
Stage 4 - Calculates the total change in nutrient loading as a result of the proposed development
Mitigation - current - Calculates the required solutions to achieve nutrient neutrality under current wastewater permit limits
Mitigation - post 2025 - Calculates the required solutions to achieve nutrient neutrality under AMP7 wastewater permit limits
Mitigation - post 2030 - Calculates the required solutions to achieve nutrient neutrality under AMP8 wastewater permit limits 		   
       
    About                              
    This nutrient budget calculator is designed to allow the user to:
- Calculate the nutrient budget for a proposed development, and if, in its current form, the proposed development is nutrient neutral; and
- Assess the various mitigation options if the proposed development is not nutrient neutral. 		   
    The tool has been designed so that the user is able to update the data and methods in light of any new research or understanding          
    The information supplied in this tool is for guidance purposes only and is not intended to provide an exact budget calculation due to the limitations and assumptions of the model. The user is responsible for ensuring the accuracy and completeness of all data entered, be it manually or automatically, and used by this tool. The user is also responsible for any commercial decisions taken on any of the outputs of this tool.      
    Royal HaskoningDHV will not be liable for any of the following arising from the use of this tool (including from any negligence on the part of Royal HaskoningDHV):
(i) loss of anticipated profits or expected future business;
(ii) damage to reputation or goodwill;
(iii) damages, costs or expenses payable by the user to any third party;
(iv) loss of any order or contract; or
(v) indirect or consequential loss of any kind. 		   
    This nutrient budget calculator has been developed by Royal HaskoningDHV on behalf of Cornwall Council.          
    Nutrient budget calculator, v3.0 (Released March 2024)          
    General help                            
The Tool uses the following colour coding to indicate the functionality to the user. These colours are: 
The user needs to input a value here
This contains fixed or calculated values and the user does not need to input a value
    Stage 1                            
    This stage calculates the change in nutrient loading as a result of changes in the population of a site.

Step 1: The user should input the additional number of units that are proposed by the development. This is then multiplied by the occupancy rate per dwelling.

Step 2: The user has the option to select whether sewage from the proposed development will be handled by Wastewater treatment works or by Package treatment plants. The user must select one or the other, both options cannot be used.

Step 2a: If the proposed development is to use Wastewater Treatment Works (WwTW), then the user should select 'Yes' from the drop down box. Following this, the user should select the WwTW that the development will connect to. This will select the discharge concentration from the chosen WwTW.

Step 2b: If the proposed development is to use Onsite treatment plants, then the user should select 'Yes' from the drop down box. Following this, the user should input the final effluent quality of the onsite treatment plant. If the efficiency is unknown then the user should input a precautionary default values. Higher removal rates can be achieved through PTPs but these will typically require additional phosphorus reduction methods that standard PTPs may not include.  
   
    Stage 2                            
    This stage calculates the nutrient load from the current land use. Step 2: The user should input the area (hectares) of the current land uses that make up the total area of the development site. A GIS viewer can be used to identify the land uses on a coarse scale (https://gridreferencefinder.com/). However, if more detail is known about the site land uses then this should be manually inputted by the user.    
    Stage 3                            
    This stage calculates the nutrient load from the current land use.

Step 2: The user should input the proposed land uses that make up the total area of the development site. Any pre-determined on-site mitigation should also be inputted here.

Bespoke banking coefficients should be inputted for constructed wetland that can be evidenced 		   
    Stage 4                            
    This stage provides a summary of the nutrient loads calculated in stages 1-3 and presents the nutrient budget for the proposed development.

A 10% precautionary buffer is included to account for uncertainties in the runoff coefficients used. The User has the option to change this buffer should this be appropriate.
    
    Mitigation - current                          
    This stage calculates the area and land uses of the mitigation site required for the proposed development to be nutrient neutral, under current WwTW permit limits.

Step 4: The user has the option to select the amount of nutrient load to be offset by the various land uses, which will then calculate the relevant area of land (Hectares) that needs to be changed.

Step 5: The user has the option to input the required area of land (hectares) to be mitigated until the project is nutrient neutral, which will then calculate the equivalent nutrient load for each land use.

The banking coefficients for wetlands uses a value for guidance purposes only. A site bespoke site-specific value will need to be calculated 		   
    Mitigation - post 2025/2030                        
    This stage calculates the area and land uses of the mitigation site required for the proposed development to be nutrient neutral, under post-2025/2030 WwTW permit limits.

Step 4: The user has the option to select the amount of nutrient load to be offset by the various land uses, which will then calculate the relevant area of land (Hectares) that needs to be changed.

Step 5: The user has the option to input the required area of land (hectares) to be mitigated until the project is nutrient neutral, which will then calculate the equivalent nutrient load for each land use. 		   
Land Use Definitions
The land uses presented in this tool followed the CORINE 2018 land use data. Definitions of key land uses are presented below:
Land Use Description
    High density urban Areas of houses and associated infrastructure. This is inclusive of roads, driveways, grass verges and gardens.

High density often applies to urban cores. High density residential developments will typically have greater than 50 units per hectare.  		   
    Medium density urban Medium density residential would apply to larger towns whereby there is a high percentage of development but situated outside of core cities. Medium density residential developments will typically have between 25 -50 units per hectare.     
    Low density urban Rural communities are classed under low density residential land. Low density residential developments will typically have less than 25 units per hectare.     
    Commercial / industrial Land used for commercial establishments (the primary purpose of buying, selling or trading of merchandise or services including, without limitation, shopping malls, office complexes, restaurants, hotels, motels, grocery stores, automobile service stations, petroleum distribution operations, dry cleaning operations, municipal yards, warehouses, law courts, museums, churches, golf courses, government offices, air and sea terminals, bus and railway stations, and storage associated with these uses) , manufacturing plants, public utilities, mining, distribution of goods or services, administration of business activities, research and development facilities, warehousing, shipping, transporting, remanufacturing, stockpiling of raw materials, storage, repair and maintenance of commercial machinery or equipment, and waste management.    
    Urban open space Area of land in urban areas used for various purposes, e.g. leisure and recreation - may include open land, e.g. sports fields, playgrounds, public squares or built facilities such as sports centres.    
    Allotment and City farms Wholly or mainly cultivated for the production of vegetable or fruit crops for consumption by the tenant or local community. In some cases the land will also be used for ornamental plants and the keeping of hens or bees.      
    Dairy Holdings on which dairy cows account for more than two thirds of their total standard output.      
    Cereals Agricultural areas on which cereals, combinable crops and set aside are farmed.    
    Horticulture Holdings on which fruit (including vineyards), hardy nursery stock, glasshouse flowers and vegetables, market garden scale vegetables, outdoor blubs and flowers and mushrooms account for more than two thirds of their total standard output.    
    Pig Farming Holdings on which pigs account for more than two thirds of their total standard output.     
    LFA Holdings on which cattle, sheep and other grazing livestock account for more than two thirds of their total standard output except holdings classified as diary. A holding is classified as LFA if more than 50% of its total area is in the Less Favoured Area (LFA).    
    Lowland grazing Holdings on which cattle, sheep and other grazing livestock account for more than two thirds of their total standard output except holdings classified as diary. A holding is classified as lowland if less than 50% of its total area is in the Less Favoured Area (LFA). A paddock is classified as a small enclosures used for grazing horses.    
    Mixed Holdings for which none of the other categories account for more than two thirds of total standard output.    
    Poultry farming Holdings on which poultry account for more than two thirds of their total standard output.     
    General Arable Agricultural areas on which arable crops (including field scale vegetables) are farmed.    
    Greenspace Natural and semi-natural outdoor spaces provided for recreational use where fertilisers will not be applied and dog waste is managed, e.g. semi-natural parks. This does not include green infrastructure within the built urban environment as this is included in the urban categories.    
    Woodland Tree-covered areas which either arose naturally or as a result of plantations. This includes conifer woodland, mixed woodlands and broad-leaved woodlands etc.    
    shrub / heathland / bracken / bog Land that contains extensive areas of either shrubs, heath or bracken. A bog refers to land that is a wetland area of muddy ground that can accumulate peat.    
    Water Areas of surface water, including rivers, ponds and lakes.    
    Meadow / semi natural grassland A meadow is a field habitat vegetated by grass and other non-woody plant that has an open character and is not grazed by livestock    
Wetland Land use specific to constructed wetland only and does not include ponds or SuDS.
    Wastewater Permit Limits                        
    Current WwTW permit limits Vs post-2025 WwTW permit limits Vs post-2030 permit limits                
The Water industry is looking to update and bring in new final effluent Total phosphorus consent which should come in before 2025, as part of the Water Industry National Environment Programme (WINEP). The enhancements are required to meet more onerous environmental permit requirements. Some WwTW in the catchment already operate at a permit limit. However, following plans by Anglian Water under AMP7, improvements will be made to some WwTWs. Further information regarding post-2025 permit limits can be found below. Where sites do not have a permit limit, a default value of 5mg/l has been applied based on the value applied by the Environment Agency routinely for modelling purposes. The Government has table an amendment to the Levelling Up and Regeneration Bill (LURB) that will place a new statutory duty on water and sewerage companies to upgrade wastewater treatment works to the highest technically achievable limits (i.e. 0.25 mg/l) by 2030 in nutrient neutrality areas. This applies to treatment works with a population of greater than 2000. However, Defra are still reviewing treatment on a case by case basis to understand whether treatment works with a population less than 200 could still be manadated to achieve TAL. Post 2030 permit limits will be incorporated into the calculated once the bill is passed. 
       
    Wastewater Treatment Works Current TP permit limit (mg/l) Post-2025 TP permit limit (mg/l) Post-2030 TP permit limit (mg/l)                  
    Blisland 5 5 5                  
    Bodmin - Nanstallon 1 1 0.25                  
    Bodmin - Scarlett's Well 1 1 0.25                  
    Camelford 1 0.8 0.25                  
Delabole 1 1 1
    Helstone 5 5 5                  
    St Breward 5 5 5                  
    St Mabyn 5 2 2                  
    St Teath 5 5 5                  
                       
    Soil Drainage Criteria                          
    The drainage characteristics of soil has a control over the dominant flow pathways for pollutant losses and as such controls the loading of Phosphorus into surface water bodies. Therefore the runoff coefficients from various land uses are different in freely draining soil compared to impermeable soil. For impermeable soil under Arable land use, it is assumed that man made drainage systems would be in place, whereas rough grazing and woodland areas would not be drained. For free-draining soil, the majority of the flow would be to groundwater, and it is assumed that drainage would not be required. The user should use the Soilscapes tool (Cranfield soil and Agrifood institute, 2020) to determine the dominant soil type on their site. Soilscapes can be found at http://www.landis.org.uk/soilscapes/index.cfm    
    The following table is used to identify the dominant drainage type of the proposed development from the soil type identified above. The drainage type should then inform Stage 2 of the calculator    
    Free draining Impermeable - drained for arable Impermeable - drained for arable & grassland      
Colour ID Name Colour ID Name colour ID Name
3 Shallow lime-rich soils over chalk or limestone
1 Saltmarsh soils
17 Slowly permeable seasonally wet acid loamy and clayey soils
      4 Sand dune soils   2 Shallow very acid peaty soils over rock   18 Slowly permeable seasonally wet slightly acid but base-rich loamy and clayey soils      
      5 Freely draining lime-rich loamy soils   8 Slightly acid loamy and clayey soils with impeded drainage   19 Slowly permeable wet very acid upland soils with a peaty surface      
      6 Freely draining slightly acid loamy soils   9 Lime-rich loamy and clayey soils with impeded drainage            
7 Freely draining slightly acid but base-rich soils
15 Naturally wet very acid sandy and loamy soils
      10 Freely draining slightly acid sandy soils   16 Very acid loamy upland soils with a wet peaty surface            
      11 Freely draining sandy Breckland soils   20 Loamy and clayey floodplain soils with naturally high groundwater            
12 Freely draining floodplain soils
21 Loamy and clayey soils of coastal flats with naturally high groundwater
      13 Freely draining acid loamy soils over rock   22 Loamy soils with naturally high groundwater          
14 Freely draining very acid sandy and loamy soils
23 Loamy and sandy soils with naturally high groundwater and a peaty surface
            24 Restored soils mostly from quarry and opencast spoil          
                  25 Blanket bog peat soils          
                  26 Raised bog peat soils          
27 Fen peat soils
                 
 
    Site address:  
    Site proposal:  
     
              Stage 1  Calculate nutrient load (Kg/year) derived from the development as a result of increased population                      
Note: This calculation should only include the additional units resulting from the proposed development, including any development that will result in overnight accommodation. For land not currently in residential use, this will be the total units proposed by the development. However, for land already in residential use, this should only be the increase in units.
                                   
                1. Calculate the additional population Value   Unit                      
Number of dwellings proposed dwellings
Average occupancy
1.93
persons/dwelling
                  Number of additional rooms above 6 residents (sui generis) for houses in multiple occupation dwellings                      
Average occupancy 1.93
persons/dwelling
Number of rooms in a hotel or guest house proposed dwellings
Average occupancy 1.93
persons/dwelling
Number of weeks open per year (1-52) Weeks
Average occupancy rate (1-100) %
                  Total population increase generated by the development   Persons                      
                                                                     
                                                                     
                2. Wastewater volume generated                                          
                                                                     
                  Water use per person                 Litres/person/day                    
                                                                     
Wastewater volume generated by the development
Litres/day
                                     
                Please select how the sewage from the proposed development will be handled, noting that a development must be handled by either wastewater treatment plants or onsite treatment plant, and cannot be handled by both. Consideration of wastewater loading is not required where a site drains to a wastewater Treatment Works that does not drain in to the River Camel catchment.                      
        Is sewage to be handled by wastewater treatment works?      
              Is sewage to be handled by Onsite treatment plants?
         
    3a. TP budget that would exit the Wastewater Treatment Works (WwTW) after treatment     3b. TP budget for Onsite treatment plants  
    Note: If the sewage is to be treated by wastewater treatment plants then the user should select "Yes" in the list above. If package treatment plants are to be used instead, then the user should select "No" above.

This is the process of collecting wastewater from houses and guiding it, via the sewage network, to WwTW (also known as sewage works). The nutrient concentration of the influent is calculated by multiplying the number of people by the expected water usage per day. The nutrient concentration within the effluent is calculated by applying the discharge level of the appropriate WwTW. The nutrient loading is expressed in kg/year. 		    Note: If the sewage is to be treated by on-site treatment plants then the user should select "Yes" in the list above. If wastewater treatment works are to be used instead, then the user should select "No" above.

On-site treatment plants are pre-manufactured treatment facilities used to treat wastewater in smaller communities or on individual properties. This concept is defined as decentralized wastewater treatment. The nutrient influent is calculated by multiplying the number of people by the expected loading per person. The nutrient effluent is calculated by applying the reduction efficiency. The nutrient loading is expressed in kg/year. 		 
         
         
    Confirm receiving WwTW and discharge level Value       Unit           Calculate nutrient load after treatment Value     Unit    
                                                                     
    Select the WwTW the development will connect to
                  Select the type of On-site treatment works  
         
                  Current discharge Post 2030 discharge                                
    Phosphorus WwTW discharge level           mg/l           Phosphorus discharge level             mg/l    
                                                                     
    Note: Please use the drop down lists to select the WwTW that the proposed development will be connected to. If the WwTW is not known, then please select 'Unknown' from the drop down list.       Note: The user must input the reduction efficiency of the PTP. The efficiency of the PTP used must be evidenced. The evidence should include the test result documents from the lab (in English) and/ or measured effluent concentrations from real world applications. If the efficiency is unknown then a precautionary default value can be used  
    Calculate the nutrient load discharged by the WwTW Value       Unit           Calculate loading from wastewater with Onsite treatment plants Value     Unit    
                  Current discharge Post 2030 discharge                                              
TP discharged by WwTW
kg/year
TP discharged by on-site treatment plant
Kg/year
                                                                       
                4. Additional population load             Value   Unit                      
Current Post 2030
TP load from additional population
Kg/year
        Stage 2 Calculate existing (pre-development) TP from current land use of the development          
Note: Where development sites include existing areas that are to be retained, these areas can be excluded from the calculations in both Stages 2 and 3.
         
        1. Identify current land uses of the development site Value Unit            
          Select the soil drainage type
             
        Note: Use the criteria table in the Help tab to identify if the soil type  
        2. Select the existing land use type(s)           TP loading      
          Hectares       Kg/yr  
          Hectares       Kg/yr  
          Hectares       Kg/yr  
          Hectares       Kg/yr  
          Hectares       Kg/yr  
          Dairy Hectares       Kg/yr  
          Lowland grazing Hectares       Kg/yr  
          Mixed Hectares       Kg/yr  
          Poultry Hectares       Kg/yr  
          Pigs Hectares       Kg/yr  
          Horticulture Hectares       Kg/yr  
          Cereals Hectares       Kg/yr  
          General Arable Hectares       Kg/yr  
          LFA Hectares       Kg/yr  
          Hectares       Kg/yr  
          Woodland (e.g. conifer, mixed, broad-leaved) Hectares       Kg/yr  
          Greenspace Hectares       Kg/yr  
          shrub / heathland / bracken / bog Hectares       Kg/yr  
          Water Hectares       Kg/yr  
Sum total
Hectares
Kg/yr
        3. Calculate loading from current land usage                  
Value Unit
          TP load from proposed land usage Kg/yr            
        Stage 3 Calculate TP for the proposed development  
Note: This section should include all land uses within the proposed development. Where the proposed scheme is to create new wetlands, woodlands, nature reserves, etc. within the development site area, then this should be included within this section. Any offsite mitigation should not be included below, and should instead be inputted in the mitigation tabs (if mitigation is required).
         
        2. Identify proposed land uses of the development site Value Unit    
High intensity urban land
Hectares
Medium intensity urban land
Hectares
          Low intensity urban land     Hectares    
          Commercial / industrial urban land Hectares    
          Open Space urban land Hectares    
          Allotments and city farms Hectares    
          Woodland (e.g. conifer, mixed, broad-leaved) Hectares    
          Greenspace Hectares    
          shrub / heathland / bracken / bog Hectares    
          Water Hectares    
3. Designed Wetlands / SuDS
Wetland / SuDS area Hectares
TP Banking coefficient Kg/ha/year
        Note: Please input the banking coefficient (i.e. wetland removal rate in kg/ha/yr) calculated for the designed wetland / SuDS. The calculated value should be justifiable with supporting evidence.  
Sum total of land uses Hectares
        Note: The sum total of land uses must equal the development site area inputted in Stage 2 - the box will colour red if the areas do not match. Wetland refers to specific wetland off a watercourse - for more information refer to the land use definitions in the help tab.  
        4. Calculate loading from proposed land usage Value Unit    
          TP load from proposed land usage Kg/year    
        Stage 4 Calculate the net change in nutrient load from the proposed development    
Note: This stage calculates the net change in TP load to the catchment from the proposed development. This is derived by calculating the difference between the load calculated for the proposed development (wastewater, urban area, open space etc.) and that for the existing land uses. The nutrient budget for the site has been calculated under current and post 2025 WwTW permit levels where applicable
           
Current
Post 2030
Summary
No. of dwellings
        1. Identify the load from additional population Value     Value Unit        
Current discharge concentration
TP Loading from additional population
Kg/year
        2. Calculate net change in nutrient load from land use change Value     Value Unit   TP current land use       
TP load from land use change
Kg/year
TP proposed land use
        3. Calculate nutrient budget for the development site Value     Value Unit            
TP budget for the site
Kg/year
        4. Calculate precautionary buffer Value     Value Unit            
          Buffer amount 20     20 %            
          TP Precautionary buffer     Kg/year            
Note: The figures used throughout this model are based on scientific research, evidence and modelled catchments and represent the best available evidence. However, it is important that a precautionary buffer is used that recognises the uncertainty with these figures and ensures, with reasonable certainty, that there will be no adverse effect on site integrity. As such, a 20% precautionary buffer is added to the budget calculations.
           
        5. Total nutrient budget for the development site Value     Value Unit            
Total Phosphorus budget for the site
Kg/year
Current WwTW Permit levels
           
           
      Post 2030 WwTW Permit levels    
           
        Mitigation - current Calculate the nutrient banking for the proposed development            
Note: This section is only required for projects that will generate additional nutrients and as a result need to implement mitigation measures, in order to achieve nutrient neutrality under the current WwTW permit limits. 
                   
                                               
        1. Total Phosphorus budget for the development site  Value                          
          TP budget to be mitigated                              
                                               
        2. Identify current land use of mitigation area                            
        2a. On-site mitigation      
          Off-site mitigation
 
                                               
        Note: If the mitigation is to be implemented on-site then the user should select "Yes" in the list above. If off-site mitigation is to be implemented instead, then the user should select "No" above.        Note: If the mitigation is to be implemented off-site then the user should select "Yes" in the list above. If on-site mitigation is to be implemented instead, then the user should select "No" above.  
          Identify current land use on-site mitigation area Value     Unit       Identify current land use of off-site mitigation area  
          Average land use of the on-site mitigation area  
Kg/ha/year       Select the soil drainage type
 
                                 
          Specific land use of on-site mitigation area               Specific land use of off-site mitigation area    
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
        LFA    
Kg/ha/year       LFA
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
                                               
        On-site mitigation land runoff coefficient               Off-site mitigation land runoff coefficient  
                                               
                                               
                mitigation land runoff coefficient                  
                                               
3. Potential land uses for mitigation Value
Unit
Constructed wetland
Hectares
        Urban open Space     Hectares                      
        Water     Hectares                      
        Woodland     Hectares                      
        Heathland / Bog     Hectares                      
        Meadow/semi-natural grassland/greenspace     Hectares                      
          Designed Wetland banking coefficient                            
            Banking coefficient   Kg/ha/year                      
        Note: This section calculates the required area (hectares) needed for each land use type to individually mitigate the total excess nutrients. This is included to provide context for the user when inputting required mitigation land uses in either section 4 and 5. Constructed wetland uses a generic runoff coefficient for guidance purposes only. Site-specific values will differ and should be manually inputted above.            
                                               
4. Identify proposed land uses for mitigation
Value
Unit
Value
        Constructed wetland     kg/year     Hectares              
        Urban open Space     kg/year     Hectares              
Water
kg/year
Hectares
        Woodland     kg/year     Hectares              
        Heathland / Bog     kg/year     Hectares              
        Meadow/semi-natural grassland/greenspace     kg/year     Hectares              
                                               
          Sum total area needed to be created     Kg/year     Hectares              
                                               
        Note: This section allows the user to input the required TP and TN to be offset for the various land uses, with the equivalent area that would be required to be created. If the mitigation is to be implemented on-site then the actual area of mitigation land may differ from the value quoted due to the relative reduction in other land uses on-site. Therefore, for on-site mitigation these areas should be used a guide and but back into Stage 3 iteratively until the project is nutrient neutral.            
        5. Identify proposed land uses for mitigation   Value   Unit   Value                  
                                               
Constructed wetland
hectares
kg/year
Urban open Space
hectares
kg/year
Water
hectares
kg/year
Woodland
hectares
kg/year
Heathland / Bog
hectares
kg/year
Meadow/semi-natural grassland/greenspace
hectares
kg/year
                                               
          Sum total area needed to be created     hectares     Kg/year              
                                               
        Note: This section allows the user to input the required area for the various land uses to be created, with the equivalent TP and TN to be offset in order for the development to be nutrient neutral. The same applies as above regarding on-site mitigation.            
        Mitigation - post 2025 Calculate the nutrient banking for the proposed development            
Note: This section is only required for projects that will generate additional nutrients and as a result need to implement mitigation measures, in order to achieve nutrient neutrality under the post 2025 WwTW permit limits. 
                   
                                               
        1. Total Phosphorus budget for the development site  Value                          
          TP budget to be mitigated                              
                                               
        2. Identify current land use of mitigation area                            
        2a. On-site mitigation      
          Off-site mitigation
 
                                               
        Note: If the mitigation is to be implemented on-site then the user should select "Yes" in the list above. If off-site mitigation is to be implemented instead, then the user should select "No" above.        Note: If the mitigation is to be implemented off-site then the user should select "Yes" in the list above. If on-site mitigation is to be implemented instead, then the user should select "No" above.  
          Identify current land use on-site mitigation area Value     Unit       Identify current land use of off-site mitigation area  
          Average land use of the on-site mitigation area  
Kg/ha/year       Select the soil drainage type
 
                                 
          Specific land use of on-site mitigation area               Specific land use of off-site mitigation area    
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
        LFA    
Kg/ha/year       LFA
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
                                               
        On-site mitigation land runoff coefficient               Off-site mitigation land runoff coefficient  
                                               
                                               
                mitigation land runoff coefficient                  
                                               
3. Potential land uses for mitigation Value
Unit
Constructed wetland
Hectares
        Urban open Space     Hectares                      
        Water     Hectares                      
        Woodland     Hectares                      
        Heathland / Bog     Hectares                      
        Meadow/semi-natural grassland/greenspace     Hectares                      
          Designed Wetland banking coefficient                            
            Banking coefficient   Kg/ha/year                      
        Note: This section calculates the required area (hectares) needed for each land use type to individually mitigate the total excess nutrients. This is included to provide context for the user when inputting required mitigation land uses in either section 4 and 5. Constructed wetland uses a generic runoff coefficient for guidance purposes only. Site-specific values will differ and should be manually inputted above.            
                                               
4. Identify proposed land uses for mitigation
Value
Unit
Value
        Constructed wetland     kg/year     Hectares              
        Urban open Space     kg/year     Hectares              
Water
kg/year
Hectares
        Woodland     kg/year     Hectares              
        Heathland / Bog     kg/year     Hectares              
        Meadow/semi-natural grassland/greenspace     kg/year     Hectares              
                                               
          Sum total area needed to be created     Kg/year     Hectares              
                                               
        Note: This section allows the user to input the required TP and TN to be offset for the various land uses, with the equivalent area that would be required to be created. If the mitigation is to be implemented on-site then the actual area of mitigation land may differ from the value quoted due to the relative reduction in other land uses on-site. Therefore, for on-site mitigation these areas should be used a guide and but back into Stage 3 iteratively until the project is nutrient neutral.            
        5. Identify proposed land uses for mitigation   Value   Unit   Value                  
                                               
Constructed wetland
hectares
kg/year
Urban open Space
hectares
kg/year
Water
hectares
kg/year
Woodland
hectares
kg/year
Heathland / Bog
hectares
kg/year
Meadow/semi-natural grassland/greenspace
hectares
kg/year
                                               
          Sum total area needed to be created     hectares     Kg/year              
                                               
        Note: This section allows the user to input the required area for the various land uses to be created, with the equivalent TP and TN to be offset in order for the development to be nutrient neutral. The same applies as above regarding on-site mitigation.            
        Mitigation - post 2030 Calculate the nutrient banking for the proposed development            
Note: This section is only required for projects that will generate additional nutrients and as a result need to implement mitigation measures, in order to achieve nutrient neutrality under the post 2030 WwTW permit limits. 
                   
                                               
        1. Total Phosphorus budget for the development site  Value                          
          TP budget to be mitigated                              
                                               
        2. Identify current land use of mitigation area                            
        2a. On-site mitigation      
          Off-site mitigation
 
                                               
        Note: If the mitigation is to be implemented on-site then the user should select "Yes" in the list above. If off-site mitigation is to be implemented instead, then the user should select "No" above.        Note: If the mitigation is to be implemented off-site then the user should select "Yes" in the list above. If on-site mitigation is to be implemented instead, then the user should select "No" above.  
          Identify current land use on-site mitigation area Value     Unit       Identify current land use of off-site mitigation area  
          Average land use of the on-site mitigation area  
Kg/ha/year       Select the soil drainage type
 
                                 
          Specific land use of on-site mitigation area               Specific land use of off-site mitigation area    
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
        LFA    
Kg/ha/year       LFA
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
           
Kg/ha/year      
 
                                               
        On-site mitigation land runoff coefficient               Off-site mitigation land runoff coefficient  
                                               
                                               
                mitigation land runoff coefficient                  
                                               
3. Potential land uses for mitigation Value
Unit
Constructed wetland
Hectares
        Urban open Space     Hectares                      
        Water     Hectares                      
        Woodland     Hectares                      
        Heathland / Bog     Hectares                      
        Meadow/semi-natural grassland/greenspace     Hectares                      
          Designed Wetland banking coefficient                            
            Banking coefficient Kg/ha/year                      
        Note: This section calculates the required area (hectares) needed for each land use type to individually mitigate the total excess nutrients. This is included to provide context for the user when inputting required mitigation land uses in either section 4 and 5. Constructed wetland uses a generic runoff coefficient for guidance purposes only. Site-specific values will differ and should be manually inputted above.            
                                               
4. Identify proposed land uses for mitigation
Value
Unit
Value
        Constructed wetland   kg/year     Hectares              
        Urban open Space   kg/year     Hectares              
Water
kg/year
Hectares
        Woodland   kg/year     Hectares              
        Heathland / Bog   kg/year     Hectares              
        Meadow/semi-natural grassland/greenspace   kg/year     Hectares              
                                               
          Sum total area needed to be created     Kg/year     Hectares              
                                               
        Note: This section allows the user to input the required TP and TN to be offset for the various land uses, with the equivalent area that would be required to be created. If the mitigation is to be implemented on-site then the actual area of mitigation land may differ from the value quoted due to the relative reduction in other land uses on-site. Therefore, for on-site mitigation these areas should be used a guide and but back into Stage 3 iteratively until the project is nutrient neutral.            
        5. Identify proposed land uses for mitigation   Value   Unit   Value                  
                                               
Constructed wetland
hectares
kg/year
Urban open Space
hectares
kg/year
Water
hectares
kg/year
Woodland
hectares
kg/year
Heathland / Bog
hectares
kg/year
Meadow/semi-natural grassland/greenspace
hectares
kg/year
                                               
          Sum total area needed to be created     hectares     Kg/year              
                                               
        Note: This section allows the user to input the required area for the various land uses to be created, with the equivalent TP and TN to be offset in order for the development to be nutrient neutral. The same applies as above regarding on-site mitigation.            
                                               
          Difference in TP mitigation land uses between current WwTW permit limits and post 2030 WwTW permit limits      
        1. Total Area of proposed TP mitigation land uses Current WwTW   Post 2030 WwTW   Difference        
                    Value   Value   Value   Units    
Constructed wetland
Hectares
          Open Space / Greenfield       Hectares    
Nature reserve
Hectares
Woodland
Hectares
Heathland / Bog
Hectares
Meadow/semi-natural grassland
Hectares
          Sum total area needed to be created         Hectares    
Note: This section demonstrates to the user the amount of mitigation land that is no longer required for the project to be 'Phosphate Neutral' following implementation of the AMP7 WwTW permit limits