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Phosphorous Budget Calculator v3.1
    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". Ramsar sites are classified as 'European Sites' under the National Planning Policy Framework (NPPF) Paragraph 176. As such, Natural England's view is that any development proposal that adds phosphorous into the catchment of Ramsar sites, such as the Somerset Levels and Moors, 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 Ramsar. Application with a Likely Effect will require an Appropriate Assessment to assess the implications of the proposal on the designated site.  
    This tool is designed to quantify the phosphorous loading of an area of land subject to a change of land use and population, in order to identify is proposed developments will be 'Phosphorous neutral'. Where the proposed development will create additional phosphorous into the system, solutions in how to offset this excess phosphorous and achieve phosphorous neutrality are presented.    
     
    This tool is only necessary for proposed developments that have the potential to increase phosphorous loading to rivers that flow into the Somerset Levels and Moors Ramsar site. 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.  
    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 phosphorous as a result of changes in the population
Stage 2 - Calculates the phosphorous load from current land use
Stage 3 - Calculates the phosphorous load from future land uses
Stage 4 - Calculates the total change in phosphorous loading as a result of the proposed development
Stage 5 - Calculates the required solutions to achieve phosphorous neutrality under current wastewater permit limits
Stage 6 - Calculates the required solutions to achieve phosphorous 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 Phosphorous budget calculator is designed to allow the user to:
- Calculate the phosphorous budget for a proposed development and if, in its current form, the proposed development is phosphorous neutral; and
- Assess the various mitigation options if the proposed development is not phosphorous 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 Phosphorous budget calculator has been developed by Royal HaskoningDHV on behalf on Somerset West and Taunton District Council.  
    Phosphorous budget calculator, v3.1 (released March 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 phosphorous 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.

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 90%. 
 
Stage 2
    This stage calculates the phosphorous 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 phosphorous 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 phosphorous loads calculated in stages 1-3 and presents the phosphorous 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 phosphorous neutral, under current WwTW permit limits.

Step 4: The user has the option to select the amount of phosphorous 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 phosphorous neutral, which will then calculate the equivalent phosphorous load for each land use.

The banking coefficients for wetlands uses a value of 8 kg/ha/yr 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 phosphorous neutral, under AMP7 WwTW permit limits.

Step 4: The user has the option to select the amount of phosphorous 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 phosphorous neutral, which will then calculate the equivalent phosphorous 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 phosphorous load results from sewer overflows and from drainage that picks up phosphorous 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  
    Cereals Holdings on which cereals, combinable crops and set-aside account for more than two thirds of the total standard output.  
    Dairy Holdings on which dairy cows account for more than two thirds of their total standard output.    
    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.   
    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 phosphorous 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. Many WwTW in Somerset do not currently have a permit limit. However, following plans by Wessex Water, a large number will operate to a new permit level under AMP7. Further information regarding AMP7 permit limits can be found in the following documents: 
     
    0501C Atkins Phosphorus removal  technology review            
    Representation C3 WINEP - Phosphorus removal            
    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 Phosphorous 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 insitute, 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: Rightwell House, Bretton, Peterborough PE3 8DW
Registered in England 1336844
W: www.royalhaskoningdhv.com
   
    Site address:  
    Site proposal:  
     
              Stage 1  Calculate Total Phosphorous (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 such contact the council and bespoke calculations may be used.                    
                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.                     
        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 Phosphorous concentration of the influent is calculated by multiplying the number of people by the expected water usage per day. The Phosphorous concentration within the effluent is calculated by applying the discharge level of the appropriate WwTW. The Phosphorous 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 Phosphorous effluent is calculated by applying the PTP reduction efficiency. The Phosphorous 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 Phosphorous loading per person     Kg/person/year    
Wastewater volume generated by the development
Litres/day
Total Phosphorous prior to treatment
Kg/year
    Confirm receiving WwTW and permit limit Value   Unit         Calculate TP load after treatment Value   Unit    
                                                           
    Select the WwTW the development will connect to
            Receiving PTP reduction efficiency     %    
                                Total Phosphorous 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 mist 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 90% 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 Phosphorous load
Kg/year
TP discharged by WwTW
Kg/day
                                                             
Phosphorous loading from WwTW
Kg/year
                3. Calculate the additional population TP load Value Unit                    
Total Phosphorous 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    
Enter the 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  
                           
          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    
          Cereals Hectares    
          Dairy Hectares    
          Cropping Hectares    
          Horticulture Hectares    
          Pig Farming Hectares    
          Lowland Grazing / paddock Hectares    
          Mixed livestock Hectares    
          Poultry Farming 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, proposed by either the developer or the Council 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 Phosphorous load from the proposed development    
Note: This stage calculates the net change in total phosphorous load to the catchment from the proposed development. This is derived by calculating the difference between the total phosphorous load calculated for the proposed development (wastewater, urban area, open space etc.) and that for the existing land uses. The phosphorous budget for the site has been calculated under current and AMP7 WwTW permit levels.
           
Current
AMP7
Summary
No. of dwellings
        1. Identify the Phosphorous load from additional population Value   Value Unit        
Phosphorous loading from additional population
Kg/year
        2. Calculate net change in Phosphorous load from land use change Value   Value Unit   TP current land use       
Phosphorous load from land use change
Kg/year
TP proposed land use
        3. Calculate phosphorous budget for the development site Value   Value Unit            
Phosphorous budget for the site
Kg/year
        4. Calculate phosphorous budget precautionary buffer Value   Value Unit            
          Buffer amount 20   20 %            
          Phosphorous 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 phosphorous budget for the development site Value   Value Unit            
Total Phosphorous 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 phosphorous and as a result need to implement mitigation measures, in order to achieve phosphorous neutrality under the current WwTW permit limits. 
                       
        1. Total Phosphorous budget for the development site  Value Unit                        
Total phosphorous 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        
        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
     
        Cereals  
Kg/ha/year     Cereals
     
        Dairy  
Kg/ha/year     Dairy
     
        Cropping  
Kg/ha/year     Cropping
     
        Horticulture  
Kg/ha/year     Horticulture
     
        Pig Farming  
Kg/ha/year     Pig Farming
     
        Lowland Grazing  
Kg/ha/year     Lowland Grazing
     
        Mixed Livestock  
Kg/ha/year     Mixed Livestock
     
        Poultry Farming  
Kg/ha/year     Poultry Farming
     
        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 phosphorous. 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 of -8 kg/ha/yr for guidance purposes only. Site-specific values will differ from this value and can 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 phosphorous 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 Phosphorous 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 phosphorous to be offset in order for the development to be phosphorous neutral. The same applies as above regarding on-site mitigation.                
        Stage 5 Calculate the AMP7 TP banking for the proposed development                
Note: This section is only required for projects that will generate additional phosphorous and as a result need to implement mitigation measures, in order to achieve phosphorous neutrality under the AMP7 WwTW permit limits. 
                       
        1. Total Phosphorous budget for the development site  Value Unit                        
Total phosphorous 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        
        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
     
        Cereals  
Kg/ha/year     Cereals
     
        Dairy  
Kg/ha/year     Dairy
     
        Cropping  
Kg/ha/year     Cropping
     
        Horticulture  
Kg/ha/year     Horticulture
     
        Pig Farming  
Kg/ha/year     Pig Farming
     
        Lowland Grazing  
Kg/ha/year     Lowland Grazing
     
        Mixed Livestock  
Kg/ha/year     Mixed Livestock
     
        Poultry Farming  
Kg/ha/year     Poultry Farming
     
        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 phosphorous. 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 of -8 kg/ha/yr for guidance purposes only. Site-specific values will differ from this value and can 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 phosphorous 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 Phosphorous 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 phosphorous to be offset in order for the development to be phosphorous 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 / SANG (<0.5 ha)       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 'Phosphorous Neutral' following implementation of the AMP7 WwTW permit limits