Trade Effluent: Settlement andConfiguration of Premises

Workshop 18th August 2015

Objectives

• Describe new features in pre-Vendor MAP which support- Trade Effluent settlement- Complex embedded Trade Effluent sites

• Pose some specific questions in respect of: - Trade Effluent settlement- Site configurations- Any new features / information required in Operational Terms- Any new market data items- Confirmation we can now reasonably capture all site

configurations• QA – indicate a small correction to Trade Effluent equations

How we will achieve this

• Brief review of measured settlement • Describe logical set up for Discharge Points• Pose specific detailed questions re TE settlement• Show new option for DPID settlement• Pose a further specific question• Introduce metered networks, and a complex embedded site• Pose two general questions about information and site

configurations• Finally, show the small correction to be made re TE

Background

• Brief review of measured settlement for - Water, Sewerage and Trade Effluent

• Contributions to measured volume arise from- Meters- Volumetric Adjustments (water, sewerage, trade effluent)- Calculated Discharges (trade effluent)

• Focus today is on the metered contribution

BackgroundA taxonomy of meters

Service Component

Potable Water

Non Potable Water

Foul Sewerage

Trade Effluent

Meter

Type

Potable Water X X XNon-Potable X X XPrivate Water X XSewerage X XPrivateTrade Effluent x X

The table shows how volumes measured by meters of different types are used in calculating volumes for various service components

We will return to this box later. It was not in MAP 3, it was introduced in pre-Vendor MAP in special circumstances.

BackgroundHow volumes are calculated• Sections A1-A6 of CSD 0207 describe the estimation of fluid volume through a meter

• DVd daily volume through the meter

• DDVd derived daily volume

= DVd or

= the net volume when the meter is a main meter in a meter network

• Estimates depend on• Meter reads• YVEd an estimate provided by a Wholesaler or Retailer

must be provided for Private Water, Sewerage and Private Trade Effluent Meters

optional for Potable Water Meters and Non-Potable Water • ILEd is a fall back for Potable Water Meters and Non-Potable Water

meters. Depends on Water Chargeable Meter Size and the

Industry Lookup Table

BackgroundWater and Sewerage Volume Calculation

W

S

Case 1:SDDVd = DDVd × RTSd

DDVd

Case 2:SDDVd = DDVd × 100%

Premises

orReturn to Sewer

Allowance

Simple typical premises Case 1: a single water meter; andCase 2: a single water meter; and a single sewerage meter

RTS is set for the meter; not for the premises

Background – Logical SetupWater and Sewerage Volumes

W

• Water Meter: RTS = 0%; • Sewerage Meter: RTS = 100% (always)

S

SDDVd = DDVd × RTSd Sewerage

Case 1:

Case 2:

DDVd Water

WSDDVd = DDVd × 0% Sewerage

DDVd Water

SDDVd = DDVd × 100% Sewerage

BackgroundWater and Sewerage Volumes• Multiple meters at a Supply Point- Add volumes from each meter of the same class

• RTS is owned by the Sewerage Wholesaler- RTS is set per meter, and can vary with time- When a Potable Water or Non-Potable Water Meter is

installed by the Water Wholesaler, RTS takes the default value provided by the Sewerage Wholesaler

- RTS can vary with time• As noted, other volumetric adjustments can be added in- Water, sewerage and trade effluent adjustments are all

independent of each other

BackgroundWater, Sewerage and TE Volumes

WTEDDVd = f(DDVd)

DDVd

SDDVd = Domestic Allowance orSDDVd = DDVd × RTSd

Premises

Production and Evaporation Allowances

Sewerage Charges

DPID

• Simple typical premises with a single water meter• TE charges are separate to standard sewerage charges; • Volumes are charged as sewerage or TE but not both

TE Charges

Logical Setup for Trade EffluentCalculation of TE Volumes

W DPID

• We create association between meters and DPIDs• The meters on the left can be any of the types which

are allowed to contribute to TE volumes.

TE DPID

PW DPID 2

W

In general the associations can be many to many

DPID 1

Any meter type

Logical Setup TE Volume

M DPIDAssociation

For every meter-DPID association

• MDVOL – a percentage of meter volume associated with the DPID• Frequently 100%, but can be less if only some of the volume goes to the

discharge point; or volume goes to multiple discharge points• 0% can also be useful

• Production allowances PA and FA as• PA – percentage allowance• FA – fixed allowance (specified as an annual number)

• Domestic Allowance DA • specified as an annual number or as None if there is no domestic allowance

TE VolumeSchematic set up

W

TEDDVd = f(DDVd )

DDVd

Premises

Sewerage Charges

DPID

If you imagine the premises logically as above:

TE Charges

Production and Evaporation Allowances

SDDVd = DA orSDDVd = DDVd × RTSd

MDVOL% × DDVd

TE VolumeMAP 3 Calculation

WDDVd DPIDAssociation

Which leads to:

TEDDVd = (MDVOL% × DDVd ) × (100% - PA%) – [DA] – FA

• If multiple meters associated with the DPID, the sum over all the meters is taken;

• Contributions from ‘calculated discharges’ or ‘volumetric allowances’ also need to be added in.

MAP 3 equation

DA and FA need divided by days in year to make daily numbers. Division by DIY is suppressed in slides for clarity.

TEDDVd

DA shown in [] because it is optional

TE VolumeMAP 3 Calculation

WDDVd DPIDAssociation

Which leads to:

TEDDVd = (MDVOL% × DDVd ) × (100% - PA%) – [DA] – FA

• If DA is None – • no domestic volume removed from sewerage calculation; • Sewerage calculation: SDDVd = DDVd × RTSd

• DA has a value• Sewerage calculation: SDDVd = DA

MAP 3

TEDDVd

TE VolumesQuestion 1

W DPIDAssociation

TEDDVd = (MDVOL% × DDVd ) × (100% - PA%) – [DA] – FA

or

TEDDVd = (MDVOL% × DDVd - [DA]) × (100% -PA%) – FA

For the avoidance of doubtThis change was made in pre-Vendor MAP

MAP 3

Pre-Vendor MAP

Question 1:Should we take off the Domestic Allowance before we apply the Percentage Allowances and the Fixed Allowance

This change which was made for pre-Vendor MAP was supported by the meeting.

Domestic AllowanceQuestion 2

MAP 3 andpreVendor MAP

SDDVd = DA (DA is a sewerage volume)

or

SDDVd = DA × RTS (DA is water volume)

Question 2:Should the Domestic Allowance be treated as a ‘sewerage’ volume or a ‘water’ volume.

For the avoidance of doubtNO change was made in pre-Vendor MAP

Proposal

Discussion Points:• Accuracy of estimating DA• Materiality of change• What RTS – RTS is set per meter. Do

you use the Wholesaler default.

This proposal was supported by the meeting, where RTS is the sewerage Wholesaler’s default RTS

TE VolumesProduction and Evaporation Allowances

WDDVd

Premises

Production and Evaporation AllowancesMDVOL% × DDVd - [DA]

Focus on the production and evaporation allowances

This now revised

Production and Evaporation AllowancesQuestion 3

MAP3preVendor MAP

If: (MDVOL% × DDVd - [DA])

TEDDVd = V × (100% -PA%) – FA

or

TEDDVd = (V – FA)× (100% -PA%) proposal

Question 3:How should we apply the Percentage Allowance and Fixed Allowance

Discussion Points• Both can give exactly the same results• Definition of FA slightly different in each case• Does one method better model ‘real

production’ better than anotherFor the avoidance of doubtNO change was made in pre-Vendor MAP

This proposal was supported by the meeting.

BackgroundTE Meter Example

WDDVd

Case 1: SDDVd = DDVd × RTSd

orCase 2: SDDVd = DA

PremisesSewerage Charges

DPID

TE

Background – Logical SetupTE Meter

Logical Setup – Case 1

W

DPID

value orNone

DA =

FA = 0PA = 0

SDDVd = DDVd × RTSd

TEAssociationMDVOL = 100%

Domestic Allowance has no effect of TE Meter

DDVd

Background – Logical SetupTE Meter

W

DPID

DA = valueFA = 0PA = 0

SDDVd = DA

TEAssociationMDVOL = 100%

Domestic Allowance has no effect of TE Meter

DDVd

AssociationMDVOL = 0%

Association of Water Meter with DPID with MDVOL at 0%• No contribution from water meter to DPID volumes• Sewerage calculation replaced by Domestic Allowance

Logical Setup – Case 2

BackgroundTE Meter – third option

WDDVd

PremisesSewerage Charges

DPID

TE

Can we subtract the TE volumes from the sewerage volumes

Case 1: SDDVd = DDVd × RTSd

Case 2: SDDVd = DA

Case 3: SDDVd = DDVd × RTSd - TE volume

DPIDsoption introduce pre-Vendor MAP

Sewerage Volume Adjustment Method (SVAM)

Sewerage calculation Allowable values for Domestic Allowance (DA)

NONE RTS method for any associated water meters None

DADomestic Allowance is applied to associated water meters

value

SUBTRACT TE volume used as a negative sewerage volume None

New feature in pre-Vendor MAP

A taxonomy of meters

Service Component

Potable Water

Non Potable Water

Foul Sewerage

Trade Effluent

Meter

Type

Potable Water X X XNon-Potable X X XPrivate Water X XSewerage X XPrivateTrade Effluent x X

Remember one of the first slides …..

New in pre-Vendor MAP The SUBTRACT option is the ONLY time

sewerage volumes pop up on a TE Meter.

DPID – Subtract OptionLogical Setup

W

DPID

DA = NoneFA = 0 probablyPA = 0% probablySVAM = SUBTRACT

SDDVd = DDVd × RTSd

TE

DDVd

• We don’t associate the DPID with the Water Meter;• Negative sewerage volume turns up on the TE Meter

TEDDVd = (MDVOL% × DDVd ) × (100% - PA%) – FA

• It may be unlikely that FA and PA are applicable, but currently we don’t constrain them – and they appear in the TE Volume equation

• We have chosen not to apply them to the sewerage volume

New in pre-Vendor MAP

DPID – Subtract OptionLogical Setup

PW DPID

DA = NoneFA = ?PA = ?SVAM = SUBTRACT

We can also use the subtract option with other meter types …

TEDDVd = (MDVOL% × DDVd ) × (100% - PA%) – FA

The consensus at the meeting was that this option was not required. Similar functionality is provided via the ‘extended’ meter network functionality below.

TEDDVd = (MDVOL% × DDVd ) × (100% - PA%) – FA

SDDVd = - (MDVOL% × DDVd )

TE Meter – Subtract OptionQuestion

DPIDDA = NoneFA = 0 probablyPA = 0% probablySVAM = SUBTRACT

TE

Question 4:What negative sewerage volume should we associate with the TE meter in respect of the sewerage.

Pre-Vendor MAP

PW DPID

DA = NoneFA = ?PA = ?SVAM = SUBTRACT

This change which was made for pre-Vendor MAP was supported by the meeting.

BackgroundMeter Networks

DDVW1d = DVW1

d – DVW2d

SDDVW1d = DDVW1

d × RTSW1d

W2

DDVW2d = DVW2

d

SDDVW2d = DDVW2

d × RTSW2d

W1

Premises 1 Premises 2

• RTS of meter 1 is used for sewerage calculation at Premises 1 (including for subtraction of meter 2)

• RTS of meter 2 is used for sewerage calculation at Premises 2 for meter 2.

• Water supplied by Wholesaler to both Premises• Both meters would be ‘Potable Water’ (or Non-Potable Water)

User Example (simplified)

Embedded Premises B

Premises A

WPW

Premises A – pays Wholesaler for all the WaterPremises A – pays Wholesaler for ‘their share’ of the seweragePremises B – pays Premises A for the waterPremises B – pays Wholesaler for ‘their share’ of the sewerage

Extensions to meter networks in pre-Vendor MAP deal with the above situation

Meter Networks option introduced pre-Vendor MAP

DDVW1d = DVW1

d

SDDVW1d = DDVW1

d × RTSW1d

= (DVW1d – DVW2

d) × RTSW1d

PW2

No water charges

SDDVW2d = DDVW2

d × RTSW2d

W1

Premises 1 Premises 2

• Water supplied by Wholesaler to both Premises 1• Premises 1 resales water to Premises 2• Both Premises pay sewerage to the Wholesaler• W1 -> Potable Water• PW2 -> Private Water Meter

Water

Sewerage

Meter Networks option introduced pre-Vendor MAP

DDVW1d = DVW1

d

SDDVW1d = DDVW1

d × RTSW1d

= (DVW1d – DVW2

d) × RTSW1d

PW2

No water charges

SDDVW2d = DDVW2

d × RTSW2d

W1

Premises

• We also allow networked Private Meters to be introduced on the same site• Can be useful in conjunction with a TE set up• Although some such cases can be dealt with via the ‘SUBTRACT’ option

Water

Sewerage

This meter network option was considered to be sufficient and the option at the third bullet above was considered unnecessary.

User Examplewhich can be handled in pre-Vendor MAP

Embedded Premises B

Domestic Waste water (20% of PW supply)

Wastewater from Premises A (abated by estimated annual wastewater volume from Embedded Premises but excluding Calculated Discharge)

Premises A

WPW

Trade Effluent (80% of PW + CSW

Calculated Discharge

Complicated SitesQuestion 4

Embedded Premises B

Domestic Waste water (20% of PW supply)

Wastewater from Premises A (abated by estimated annual wastewater volume from Embedded Premises but excluding Calculated Discharge)

Premises A

WPW

Trade Effluent (80% of PW + CSW

Calculated Discharge

• Do the Operational Terms processes address all situations: • Should the forms allow for the collection of more information which could describe

complicated sites; or does this come from a site visit:• Are there any additional market data items needed?

• Yes• Considered No

as the site visit will provide any further information required; text of Operational Terms to be reviewed

• MOSL to review market reports of relationships

Complicated SitesQuestion 5

Question 5:Do we now have all the flexibility that is needed to reasonably model real scenarios

No other issues were raised by the meeting in relation to site configurations.It was noted that processes G7 – G9 on metering matters may be more appropriate in Part B of the Operational Terms.

QualityTE Correction• Within this equation

• Look at the Ammonia, X, Y, Z terms, eg using ammonia

QualityTE Correction• The Heaviside term only takes the value 0,1

• It should be

0 if the term (Atd – Amd )/Asd is negative

(Atd – Amd )/Asd if the term (Atd – Amd )/Asd is positive

• We will use a different function to achieve this.

Pre-Vendor MAP

Change for Post-Vendor MAP

Noted by the meeting

Conclusions

• Discussed new features in pre-Vendor MAP

- TE settlement- Complex embedded sites

• Reviewed specific questions in respect of settlement and data