River Camel Phosphate Budget Calculator v1.1
See the source image
 
    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 phosphate loading of an area of land subject to a change of land use and population, in order to identify is proposed developments will be 'Phosphate neutral'. Where the proposed development will create additional phosphate into the system, solutions in how to offset this excess phosphate and achieve phosphate neutrality are presented.    
     
    This tool is only necessary for proposed developments that have the potential to increase phosphate 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. This could be the case at locations such as Bodmin, Delabole and St Mabyn. Alternatively, where a site is located within the hydrological catchment but drains to a WwTWs outside of the catchment (i.e. Luxulyan and Wadebridge) then Stage 1 should be set so that the occupancy rate is zero.  
    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.   
    This tool consists of seven main worksheets:

Stage 1 - Identifies the additional phosphate as a result of changes in the population
Stage 2 - Calculates the phosphate load from current land use
Stage 3 - Calculates the phosphate load from future land uses
Stage 4 - Calculates the total change in phosphate loading as a result of the proposed development
Stage 5 - Calculates the required solutions to achieve phosphate neutrality under current wastewater permit limits
Stage 6 - Calculates the required solutions to achieve phosphate neutrality under AMP7 wastewater permit limits
Stage 7 - Calculates the difference in mitigation solutions between current wastewater permit limits and AMP7 permit limits
 
     
    About                      
    This Phosphate budget calculator is designed to allow the user to:
- Calculate the phosphate budget for a proposed development, and if, in its current form, the proposed development is phosphate neutral; and
- Assess the various mitigation options if the proposed development is not phosphate 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 Phosphate budget calculator has been developed by Royal HaskoningDHV on behalf on Cornwall Council  
    Phosphate budget calculator, v1.1 (Released October 2021)  
    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 phosphate 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 calculate the discharge limit from the selected WwTW, which is assumed to be 90% of the Permit limit. This assumption is on the basis that water companies operate with a sufficient head room of their permit limits.

Step 2b: If the proposed development is to use
Package Treatment Plants (PTPs), then the user should select 'Yes' from the drop down box. Following this, the user should input the reduction efficiency of the package treatment plant. If the efficiency is unknown then the user should input a precautionary efficiency of 50%. Higher removal rates can be achieved through PTPs but these will typically require additional phosphate reduction such as chemical dosing that standard PTPs may not include.  
 
    Stage 2                    
    This stage calculates the Phosphate 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 phosphate 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 phosphate loads calculated in stages 1-3 and presents the phosphate budget for the proposed development.

A 20% 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.
 
    Stage 5                    
    This stage calculates the area and land uses of the mitigation site required for the proposed development to be phosphate neutral, under current WwTW permit limits.

Step 4: The user has the option to select the amount of phosphate 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 phosphate neutral, which will then calculate the equivalent phosphate 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
 
    Stage 6                    
    This stage calculates the area and land uses of the mitigation site required for the proposed development to be phosphate neutral, under AMP7 WwTW permit limits.

Step 4: The user has the option to select the amount of phosphate 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 phosphate neutral, which will then calculate the equivalent phosphate load for each land use.
 
    Stage 7                    
    This stage provides a summary in the differences in mitigation land use area between the current WwTW permit limits and the AMP7 WwTW permit limits  
    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
    Urban Development which encompasses the built form, gardens, pathing, roads, hardstanding's, parks and small areas of open space, ponds and SuDS. The phosphate load results from sewer overflows and from drainage that picks up phosphate on the urban land. Agricultural barns used for storage of materials, farming supplies and temporary livestock can be classified as Urban. However, barns used for a specific farming type (e.g. piggeries and chicken farms) should be classified under the relevant farming land use.  
    Mineral Workings and Quarries An open or surface mineral working, usually for the extraction of building stone, as slate, limestone, etc.  
    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.    
    Sports and Leisure facilities Facilities used for recreational purposes such as managed sports pitches, athletic fields, gymnasiums, swimming pools etc.   
    Transport tracks and ways Encompasses large infrastructure such as motorways and significant rail infrastructure. Small scale roads and tracks are covered under the Urban land use  
    Transport terminals A large scale facility where passengers and freight are assembled or dispersed  
    Dairy Holdings on which dairy cows account for more than two thirds of their total standard output.    
    Roots and Combinable Holdings on which both root crops (e.g. potato, carrot, parsnip, beet, turnip) and combinable crops (crops harvested using a combine harvester) (e.g. Wheat, Barley, Oilseed rape) are the dominant farming type  
    Mixed Combinable Holdings on which Winter Wheat, Winter Barley, Spring Barley and Winter Oilseed rape dominate  
    Winter Combinable Holdings on which Winter Wheat, Winter Barley and Winter Oilseed rape dominate, with no Spring Barley grown.  
    Cropping Holdings on which arable crops (including field scale vegetables) account for more than two thirds of the total standard output, excluding holdings classified as cereals; holdings on which a mixture of arable and horticultural crops account for more than two thirds of their total SO excluding holdings classified as horticulture and holdings on which arable crops account for more than one third of their total standard output and no other grouping accounts for more than one third.  
    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.   
    Upland 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 more than 50% of its total area is in the Less Favoured Area (LFA).  
    Lowland grazing / Paddock 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 livestock Holdings for which none of the other categories account for more than two thirds of total standard output. This category includes mixed pigs and poultry farms as wells as farms with a mixture of crops and livestock (which neither accounts for more than two thirds of standard output.   
    Poultry farming Holdings on which poultry account for more than two thirds of their total standard output.   
    General Arable Use this option if unsure of the breakdown of arable land.  
    Improved grass Land used for grazing (other than arable land) where over one third of the sward comprises, singly or in a mixture, ryegrass, cocksfoot or timothy, or land that has been improved by management practices such as liming and top dressing, where there is not a significant presence of sensitive plants species indicative of native unimproved grassland.   
    Unimproved grass Land used for grazing or mowing which is not normally treated with mineral fertiliser or lime and contains a significant presence of sensitive plant species indicative of native unimproved grassland.   
    Open Space / Greenfield Greenfield areas that have not been in agricultural use for at least 10 years and are not subject to unmanaged recreational use.  
    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.  
    Freshwater marsh Non-tidal, non-forested marsh wetland that contains fresh water, and is continuously or frequently flooded.  
    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 AMP7 WwTW permit limits        
The Water industry is looking to update and bring in new final effluent phosphate 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 South West Water under AMP7, improvements will be made to Camelford and St Mabyn. Further information regarding AMP7 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 
     
    Wastewater Treatment Works Current permit limit (mg/l) AMP7 permit limit (mg/l)            
    Camelford 1 0.8            
    St Breward 5 5            
    Blisland 5 5            
    Bodmin - Scarlett's Well 1 1            
    Bodmin - Nanstallon 1 1            
               
               
    St Teath            
               
               
    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 Phosphate 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  
Colour ID Name Colour ID Name
3 Shallow lime-rich soils over chalk or limestone
1 Saltmarsh soils
4 Sand dune soils
2 Shallow very acid peaty soils over rock
      5 Freely draining lime-rich loamy soils   8 Slightly acid loamy and clayey soils with impeded drainage  
      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
17 Slowly permeable seasonally wet acid loamy and clayey soils
12 Freely draining floodplain soils
18 Slowly permeable seasonally wet slightly acid but base-rich loamy and clayey soils
13 Freely draining acid loamy soils over rock
19 Slowly permeable wet very acid upland soils with a peaty surface
14 Freely draining very acid sandy and loamy soils
20 Loamy and clayey floodplain soils with naturally high groundwater
21 Loamy and clayey soils of coastal flats with naturally high groundwater
22 Loamy soils with naturally high groundwater
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
              HaskoningDHV UK Ltd., a company of Royal HaskoningDHV
Stratus House, Emperor Way, Exeter, Devon  EX1 3QS
Registered Office: Westpoint, Lynch Wood Business Park,
Peterborough PE2 6FZ
Registered in England 1336844
W: www.royalhaskoningdhv.com
   
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    Site address:  
    Site proposal:  
     
              Stage 1  Calculate Total Phosphorus (TP) in (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 units as flats, care-home, residential institution proposed dwellings
Average occupancy
1.65 persons/dwelling
Number of houses proposed dwellings
Average occupancy
2.4 persons/dwelling
                  Number of additional rooms above 6 residents (sui generis) for houses in multiple occupation dwellings                    
Average occupancy 1.65 persons/dwelling
Number of rooms in a hotel or guest house proposed dwellings
Average occupancy 1.65 persons/dwelling
Number of weeks open per year (1-52) Weeks
Average occupancy rate (1-100) %
                  Total population increase generated by the development Persons                    
              Note: The national average occupancy rate of 2.4 persons per dwelling is used for in this model. The number of proposed units should be evidenced. In the case of hotel and guest house average occupancy rates should also be evidenced. Developments that do not fall within these classifications should contact the Council regarding bespoke calculations.                    
                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 package treatment, 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 - in this case the occupancy rate should be set to zero.                    
        Is sewage to be handled by wastewater treatment works?  
            Is sewage to be handled by Package Treatment plants?
       
    2a. TP budget that would exit the Wastewater Treatment Works (WwTW) after treatment     2b. TP budget for Package Treatment Plants (PTPs)  
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 Phosphate concentration of the influent is calculated by multiplying the number of people by the expected water usage per day. The Phosphate concentration within the effluent is calculated by applying the discharge level of the appropriate WwTW. The Phosphate loading is expressed in kg/year.
Note: If the sewage is to be treated by package treatment plants then the user should select "Yes" in the list above. If wastewater treatment plants are to be used instead, then the user should select "No" above.

Packaged wastewater 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 Phosphorous influent is calculated by multiplying the number of people by the expected loading per person. The Phosphate effluent is calculated by applying the PTP reduction efficiency. The Phosphate loading is expressed in kg/year.
         
         
    Calculate the wastewater volume generated   Value   Unit         Calculate TP load prior to treatment Value   Unit    
    Total population increase generated by the development   Persons         Total population increase generated by the development   Persons    
    Water use per person           Litres/person/day       Average Phosphate loading per person     Kg/person/year    
Wastewater volume generated by the development
Litres/day
Total Phosphorus prior to treatment
Kg/year
    Confirm receiving WwTW and discharge level Value   Unit         Calculate TP load after treatment Value   Unit    
                                                           
    Select the WwTW the development will connect to
            Receiving PTP reduction efficiency     %    
                                Total Phosphorus discharge after PTP treatment       Kg/year    
    WwTW 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 value of 50% can be used.  
    Calculate the TP discharged by the WwTW Value   Unit         Calculate TP load from development wastewater with on-site PTP Value   Unit    
                                                           
TP discharged by WwTW
mg/day
PTP Total Phosphorus load
Kg/year
TP discharged by WwTW
Kg/day
                                                             
Phosphate loading from WwTW
Kg/year
                3. Calculate the additional population TP load Value Unit                    
Total Phosphorus 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. Total area of development site Value Unit          
Total area of the development site Hectares
        2. Identify current land uses of the development site Value Unit          
Identify the drainage type of the soil on site
Is the soil type free draining?
        Note: Identify the soil drainage type from the Viewer, and use the criteria table in the Help tab to identify if the soil is either permeable or impermeable        
                          Drainage system installed on managed grassland fields?  
Urban development Hectares
Mineral workings and quarries Hectares
Open space / Greenfield Hectares
Allotments and city farms Hectares
Sports and leisure facilities Hectares
Transport tracks and ways Hectares
Transport terminals Hectares
Dairy Hectares
Lowland grazing Hectares
Upland grazing Hectares
Mixed Livestock Hectares
Outdoor pig Hectares
Roots and Combinable Hectares
Mixed combinable Hectares
Winter combinable Hectares
Horticulture Hectares
Poultry Hectares
Indoor pig Hectares
General Arable Hectares
Improved grass Hectares
Unimproved grass Hectares
Woodland (e.g. conifer, mixed, broad-leaved) Hectares
shrub / heathland / bracken / bog Hectares
freshwater marsh Hectares
Meadow / semi natural grassland Hectares
Sum total of land uses
Hectares
        Note: The sum total of land uses must equal the development site area - the box will colour red if the areas do not match.        
        3. Calculate TP from current land usage Value Unit          
TP load from current land usage Kg/year
        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 Stage 5 (if mitigation is required).
         
        1. Total area of development site Value Unit    
Total area of the development site Hectares
        2. Identify proposed land uses of the development site Value Unit    
          Urban development Hectares    
          Open Space / Greenfield Hectares    
          Woodland Hectares    
          Nature reserve Hectares    
          Heathland / Bog Hectares    
          Allotment Hectares    
          Meadow/semi-natural grassland Hectares    
          Sports and Leisure facilities Hectares    
        Note: The sum total of land uses must equal the development site area inputted in stage 1 - 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.  
3. Designed Wetlands / SuDS
Wetland / SuDS area Hectares
Banking coefficient Kg/ha/year
        Note: Please input the banking coefficient calculated for the designed wetland / SuDS. The calculated value should be justifiable.  
Sum total of land uses Hectares
        4. Calculate TP from proposed land usage Value Unit    
TP load from proposed land usage Kg/year
        5. Calculation of gross P loading Value Unit    
                           
Gross TP load from current and proposed land usage Kg/year
Note: this step is for illustrative purposes when iteratively creating mitigation land on-site
        Stage 4 Calculate the net change in Phosphorus load from the proposed development    
Note: This stage calculates the net change in total phosphorus load to the catchment from the proposed development. This is derived by calculating the difference between the total phosphorus load calculated for the proposed development (wastewater, urban area, open space etc.) and that for the existing land uses. The phosphate budget for the site has been calculated under current and AMP7 WwTW permit levels.
           
Current
AMP7
Summary
No. of dwellings
        1. Identify the Phosphate load from additional population Value   Value Unit        
Phosphate loading from additional population
Kg/year
        2. Calculate net change in Phosphate load from land use change Value   Value Unit   TP current land use       
Phosphate load from land use change
Kg/year
TP proposed land use
        3. Calculate phosphate budget for the development site Value   Value Unit            
Phosphate budget for the site
Kg/year
        4. Calculate phosphate budget precautionary buffer Value   Value Unit            
          Buffer amount 20   20 %            
          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 built into the calculation.
           
        5. Total phosphorus budget for the development site Value   Value Unit            
Total Phosphorus budget for the site
Kg/year
Current WwTW Permit levels
         
AMP7 WwTW Permit levels
         
        Stage 5 Calculate the current TP banking for the proposed development                  
Note: This section is only required for projects that will generate additional phosphate and as a result need to implement mitigation measures, in order to achieve phosphate neutrality under the current WwTW permit limits. 
                         
        1. Total Phosphorus budget for the development site  Value Unit                          
Total phosphorus budget to be mitigated
Kg/year
        2. Identify current land use of mitigation area                              
2a. On-site mitigation
2b. 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     Identify the drainage type of the soil on the mitigation site      
                              Is the soil type free draining?
       
                            Note: Identify the soil drainage type from the Viewer, and use the criteria table in the Help tab to identify if the soil is either permeable or impermeable  
          Specific land use of on-site mitigation area           Specific land use of off-site mitigation area     Drainage system installed on managed grassland fields?    
        Urban development  
Kg/ha/year     Urban development
       
        Mineral workings and quarries  
Kg/ha/year     Mineral workings and quarries
       
        Open space / Greenfield  
Kg/ha/year     Open space / Greenfield
       
        Allotments and city farms  
Kg/ha/year     Allotments and city farms
       
        Sports and leisure facilities  
Kg/ha/year     Sports and leisure facilities
       
        Transport tracks and ways  
Kg/ha/year     Transport tracks and ways
       
        Transport terminals  
Kg/ha/year     Transport terminals
       
        Dairy  
Kg/ha/year     Dairy
   
   
        Lowland grazing  
Kg/ha/year     Lowland grazing
   
   
        Upland grazing  
Kg/ha/year     Upland grazing
   
   
        Mixed Livestock  
Kg/ha/year     Mixed Livestock
   
   
        Outdoor pig  
Kg/ha/year     Outdoor pig
   
   
        Roots and Combinable  
Kg/ha/year     Roots and Combinable
   
   
        Mixed combinable  
Kg/ha/year     Mixed combinable
   
   
        Winter combinable  
Kg/ha/year     Winter combinable
   
   
        Horticulture  
Kg/ha/year     Horticulture
   
   
        Poultry  
Kg/ha/year     Poultry
   
   
        Indoor pig  
Kg/ha/year     Indoor pig
   
   
        General Arable  
Kg/ha/year     General Arable
   
   
        Improved grass  
Kg/ha/year     Improved grass
           
        Unimproved grass  
Kg/ha/year     Unimproved grass
       
        Woodland (e.g. conifer, mixed, broad-leaved)  
Kg/ha/year     Woodland (e.g. conifer, mixed, broad-leaved)
       
        shrub / heathland / bracken / bog  
Kg/ha/year     shrub / heathland / bracken / bog
       
        freshwater marsh  
Kg/ha/year     freshwater marsh
       
        Meadow / semi natural grassland  
Kg/ha/year     Meadow / semi natural grassland
       
                                                 
        On-site mitigation land runoff coefficient           Off-site mitigation land runoff coefficient        
                                                 
                mitigation land runoff coefficient                    
                                                 
        3. Identify proposed land uses for mitigation Value Unit                          
Constructed wetland
Hectares
Open Space / Greenfield
Hectares
Nature reserve
Hectares
Woodland
Hectares
Heathland / Bog
Hectares
Meadow/semi-natural grassland
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 phosphate. 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 Unit                    
                                                 
Constructed wetland
kg/year
Hectares
Open Space / Greenfield
kg/year
Hectares
Nature reserve
kg/year
Hectares
        Woodland   kg/year   Hectares                    
        Heathland / Bog   kg/year   Hectares                    
        Meadow/semi-natural grassland   kg/year   Hectares                    
Sum total area needed to be created
Kg/year
Hectares
        Note: This section allows the user to input the required total phosphate 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 Phosphate neutral.                  
        5. Identify proposed land uses for mitigation   Value Unit   Value Unit                    
                                                 
Constructed wetland
hectares
kg/year
Open Space / Greenfield
hectares
kg/year
Nature reserve
hectares
kg/year
Woodland
hectares
kg/year
Heathland / Bog
hectares
kg/year
Meadow/semi-natural grassland
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 total phosphate to be offset in order for the development to be phosphate neutral. The same applies as above regarding on-site mitigation.                  
                                                 
        Stage 5 Calculate the current TP banking for the proposed development                  
Note: This section is only required for projects that will generate additional phosphate and as a result need to implement mitigation measures, in order to achieve phosphate neutrality under the AMP7 WwTW permit limits. 
                         
        1. Total Phosphorus budget for the development site  Value Unit                          
Total phosphorus budget to be mitigated
Kg/year
        2. Identify current land use of mitigation area                              
2a. On-site mitigation
2b. 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     Identify the drainage type of the soil on the mitigation site      
                              Is the soil type free draining?
       
                            Note: Identify the soil drainage type from the Viewer, and use the criteria table in the Help tab to identify if the soil is either permeable or impermeable  
          Specific land use of on-site mitigation area           Specific land use of off-site mitigation area     Drainage system installed on managed grassland fields?    
        Urban development  
Kg/ha/year     Urban development
       
        Mineral workings and quarries  
Kg/ha/year     Mineral workings and quarries
       
        Open space / Greenfield  
Kg/ha/year     Open space / Greenfield
       
        Allotments and city farms  
Kg/ha/year     Allotments and city farms
       
        Sports and leisure facilities  
Kg/ha/year     Sports and leisure facilities
       
        Transport tracks and ways  
Kg/ha/year     Transport tracks and ways
       
        Transport terminals  
Kg/ha/year     Transport terminals
       
        Dairy  
Kg/ha/year     Dairy
   
   
        Lowland grazing  
Kg/ha/year     Lowland grazing
   
   
        Upland grazing  
Kg/ha/year     Upland grazing
   
   
        Mixed Livestock  
Kg/ha/year     Mixed Livestock
   
   
        Outdoor pig  
Kg/ha/year     Outdoor pig
   
   
        Roots and Combinable  
Kg/ha/year     Roots and Combinable
   
   
        Mixed combinable  
Kg/ha/year     Mixed combinable
   
   
        Winter combinable  
Kg/ha/year     Winter combinable
   
   
        Horticulture  
Kg/ha/year     Horticulture
   
   
        Poultry  
Kg/ha/year     Poultry
   
   
        Indoor pig  
Kg/ha/year     Indoor pig
   
   
        General Arable  
Kg/ha/year     General Arable
   
   
        Improved grass  
Kg/ha/year     Improved grass
           
        Unimproved grass  
Kg/ha/year     Unimproved grass
       
        Woodland (e.g. conifer, mixed, broad-leaved)  
Kg/ha/year     Woodland (e.g. conifer, mixed, broad-leaved)
       
        shrub / heathland / bracken / bog  
Kg/ha/year     shrub / heathland / bracken / bog
       
        freshwater marsh  
Kg/ha/year     freshwater marsh
       
        Meadow / semi natural grassland  
Kg/ha/year     Meadow / semi natural grassland
       
                                                 
        On-site mitigation land runoff coefficient           Off-site mitigation land runoff coefficient        
                                                 
                mitigation land runoff coefficient                    
                                                 
        3. Identify proposed land uses for mitigation Value Unit                          
Constructed wetland
Hectares
Open Space / Greenfield
Hectares
Nature reserve
Hectares
Woodland
Hectares
Heathland / Bog
Hectares
Meadow/semi-natural grassland
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 phosphate. 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 Unit                    
                                                 
Constructed wetland
kg/year
Hectares
Open Space / Greenfield
kg/year
Hectares
Nature reserve
kg/year
Hectares
        Woodland   kg/year   Hectares                    
        Heathland / Bog   kg/year   Hectares                    
        Meadow/semi-natural grassland   kg/year   Hectares                    
Sum total area needed to be created
Kg/year
Hectares
        Note: This section allows the user to input the required total phosphate 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 Phosphate neutral.                  
        5. Identify proposed land uses for mitigation   Value Unit   Value Unit                    
                                                 
Constructed wetland
hectares
kg/year
Open Space / Greenfield
hectares
kg/year
Nature reserve
hectares
kg/year
Woodland
hectares
kg/year
Heathland / Bog
hectares
kg/year
Meadow/semi-natural grassland
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 total phosphate to be offset in order for the development to be phosphate neutral. The same applies as above regarding on-site mitigation.                  
                                                 
        Stage 7 Difference in mitigation land uses between current WwTW permit limits and AMP7 WwTW permit limits      
        1. Total Area of proposed mitigation land uses Current WwTW   AMP7 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