Laterals & 0D inflow

Laterals add or subtract water from the model domain. 0D inflow includes flow from Surfaces and dry weather flow. Surfaces calculate runoff from rain onto a predefined surface area, using a simple hydrological calculation. Dry weather flow is a specific type of lateral, used to simulate the inflow into sanitary sewers from households and industry.

For more information see:

Schematisation objects in this category are:

1D Lateral

Defines a lateral discharge (source or sink term) for the 1D domain

Layer name

lateral_1d

Geometry

Point

Attributes

Table 33 1D Lateral attributes

Attribute alias

Field name

Type

Mandatory

Units

Description

ID

id

integer

Yes

-

Unique identifier

Code

code

text

No

-

Name field, no constraints

Display name

display_name

text

No

-

Name field, no constraints

Offset

offset

integer

No

seconds

The lateral will be applied offset seconds after the start of the simulation

Units

units

text

Yes

-

Units of the lateral flux. Possible values: ‘m3/s’

Time units

time_units

text

Yes

-

Units of the time step. Possible values: ‘seconds’, ‘minutes’, ‘hours’

Interpolate

interpolate

boolean

Yes

-

True: flux will be interpolated between time steps. False: flux will remain contant until the next time step

Time series

timeseries

text

Yes

-

CSV-style table of ‘time_step,value’ pairs, separated by newline character.

Connection node ID

connection_node_id

integer

Yes

-

Foreign key reference to an ID in Connection node

Tags

tags

text

No

-

Comma-separated list of foreign key references to ID’s in Tag

Notes for modellers

1D laterals placed on a connection node with a 1D boundary condition will be ignored.

Time series

Format the time series as Comma Separated Values (CSV), with the time (in seconds, minutes or hours since the start of the simulation) in the first column and the value (m³/s) in the second column. For example:

0,0.2
15,10.0
30,20.0
45,7.5
60,0.0

  • The time series string cannot contain any spaces or empty rows

  • The lateral time series is stored in the simulation template and is not part of the 3Di model itself. It can be overridden when starting a new simulation, without the need to create a new revision of the schematisation.

  • When posted to the 3Di server, the time steps will be converted to seconds. If you upload a CSV file with lateral time series via the simulation wizard, the time units should always be in seconds (see Laterals)

  • Positive values represent a source (water is added to the node), negative values represent a sink (water is extracted from the node to the extent that this water is available in the node)

  • The time series does not need to cover the entire simulation period.

  • When editing the time series field in using SQL (sqlite dialect), use char(10) as line separator. The example time series shown above would look like this:

    '0,0.2'||char(10)||'15,10.0'||char(10)||'30,20.0'||char(10)||'45,7.5'||char(10)||'60,0.0'

2D Lateral

Lateral discharge for 2D cell. The lateral flux will be added or subtracted from the cell the lateral is in.

Layer name

lateral_2d

Geometry

Point

Attributes

Table 34 2D Lateral attributes

Attribute alias

Field name

Type

Mandatory

Units

Description

ID

id

integer

Yes

-

Unique identifier

Code

code

text

No

-

Name field, no constraints

Display name

display_name

text

No

-

Name field, no constraints

Lateral type

type

integer

Yes

-

Possible values: 1 (Surface lateral)

Offset

offset

integer

No

seconds

The lateral will be applied offset seconds after the start of the simulation

Units

units

text

Yes

-

Units of the lateral flux. Possible values: ‘m3/s’

Time units

time_units

text

Yes

-

Units of the time step. Possible values: ‘seconds’, ‘minutes’, ‘hours’

Interpolate

interpolate

boolean

Yes

-

True: flux will be interpolated between time steps. False: flux will remain contant until the next time step

Time series

timeseries

text

Yes

-

CSV-style table of ‘time_step,value’ pairs, separated by newline character.

Tags

tags

text

No

-

Comma-separated list of foreign key references to ID’s in Tag

Notes for modellers

Time series

Format the time series as Comma Separated Values (CSV), with the time (in seconds, minutes or hours since the start of the simulation) in the first column and the value (m³/s) in the second column. For example:

0,0.2
15,10.0
30,20.0
45,7.5
60,0.0

  • The time series string cannot contain any spaces or empty rows

  • The lateral time series is stored in the simulation template and is not part of the 3Di model itself. It can be overridden when starting a new simulation, without the need to create a new revision of the schematisation.

  • When posted to the 3Di server, the time steps will be converted to seconds. If you upload a CSV file with lateral time series via the simulation wizard, the time units should always be in seconds (see Laterals)

  • Positive values represent a source (water is added to the node), negative values represent a sink (water is extracted from the node to the extent that this water is available in the node)

  • The time series does not need to cover the entire simulation period.

  • When editing the time series field in using SQL (sqlite dialect), use char(10) as line separator. The example time series shown above would look like this:

    '0,0.2'||char(10)||'15,10.0'||char(10)||'30,20.0'||char(10)||'45,7.5'||char(10)||'60,0.0'

Dry weather flow

Location that produces a specified sewerage flow. The dry weather flow production varies throughout the day, as defined in the referenced Dry weather flow distribution record.

The geometry is purely administrative, helping you to understand where the dry weather flow is produced (e.g. a specific building, a housing block or industrial area).

Layer name

dry_weather_flow

Geometry

Polygon

Attributes

Table 35 Dry weather flow attributes

Attribute alias

Field name

Type

Mandatory

Units

Description

ID

id

integer

Yes

-

Unique identifier

Code

code

text

No

-

Name field, no constraints

Display name

display_name

text

No

-

Name field, no constraints

Daily total

daily_total

decimal number

Yes

Liters

Total dry weather flow production per day (before multiplier is applied). Can be used as e.g. dry weather flow production per inhabitant.

Multiplier

multiplier

decimal number

Yes

-

Daily total is multiplied by this number. Can be used as e.g. number of inhabitants.

Distribution

dry_weather_flow_distribution_id

integer

Yes

-

Foreign key reference to an ID in Dry weather flow distribution

Tags

tags

text

No

-

Comma-separated list of foreign key references to ID’s in Tag

Dry weather flow map

Connection between a Dry weather flow feature and its target connection node.

Layer name

dry_weather_flow_map

Geometry

Line

Attributes

Table 36 Dry weather flow map attributes

Attribute alias

Field name

Type

Mandatory

Units

Description

ID

id

integer

Yes

-

Unique identifier

Code

code

text

No

-

Name field, no constraints

Display name

display_name

text

No

-

Name field, no constraints

Percentage

percentage

decimal number

Yes

%

Percentage of DWF produced by the referenced Dry weather flow feature that should flow to the referenced connection_node

Connection node ID

connection_node_id

integer

Yes

-

Foreign key reference to an ID in Connection node

Dry weather flow ID

dry_weather_flow_id

integer

Yes

-

Foreign key reference to an ID in Dry weather flow

Tags

tags

text

No

-

Comma-separated list of foreign key references to ID’s in Tag

Dry weather flow distribution

Intra-day distribution of dry weather flow production over a 24 hour period. The first value is for the first hour (00:00-01:00), the second value for 01:00-02:00.

Layer name

dry_weather_flow_distribution

Geometry

No geometry

Attributes

    • Attribute alias

    • Field name

    • Type

    • Mandatory

    • Units

    • Description

    • ID

    • id

    • integer

    • Yes

    • -

    • Unique identifier

    • Description

    • description

    • text

    • Yes

    • %

    • Exactly 24 comma-separated values that must add up to 100

    • Tags

    • tags

    • text

    • No

    • -

    • Comma-separated list of foreign key references to ID’s in Tag

Surface

Definition of 0D inflow surface using custom rainfall-runoff parameters. See Rainfall on 0D node (inflow) for further details.

Layer name

surface

Geometry

Polygon

Attributes

Table 37 Surface attributes

Attribute alias

Field name

Type

Mandatory

Units

Description

ID

id

integer

Yes

-

Unique identifier

Code

code

text

No

-

Name field, no constraints

Display name

display_name

text

No

-

Name field, no constraints

Area

area

decimal number

Yes

m:sup:2

Area that is used to calculate the precipitation input to the inflow model. The area of the feature’s geometry is not used for this.

Surface parameters

surface_parameters_id

integer

Yes

-

Foreign key reference to an ID in Surface parameters

Tags

tags

text

No

-

Comma-separated list of foreign key references to ID’s in Tag

Surface map

Connection between a surface and its target connection node.

Table 38 Surface map attributes

Attribute alias

Field name

Type

Mandatory

Units

Description

ID

id

integer

Yes

-

Unique identifier

Code

code

text

No

-

Name field, no constraints

Display name

display_name

text

No

-

Name field, no constraints

Percentage

percentage

decimal number

Yes

%

Percentage of runoff produced by the referenced Surface feature that should flow to the referenced connection_node

Connection node ID

connection_node_id

integer

Yes

-

Foreign key reference to an ID in Connection node

Surface ID

surface_id

integer

Yes

-

Foreign key reference to an ID in Surface

Tags

tags

text

No

-

Comma-separated list of foreign key references to ID’s in Tag

Surface parameters

Custom rainfall-runoff parameters to be used by surfaces. By default, the surface parameters table is populated with the parameter set from the Dutch NWRW model for sewerage inflow; you can add other parameterisations as you see fit.

Layer name

surface_parameters

Geometry

No geometry

Attributes

    • Attribute alias

    • Field name

    • Type

    • Mandatory

    • Units

    • Description

    • ID

    • id

    • integer

    • Yes

    • -

    • Unique identifier

    • Description

    • description

    • text

    • Yes

    • %

    • Exactly 24 comma-separated values that must add up to 100

    • Surface layer thickness

    • surface_layer_thickness

    • decimal number

    • mm

    • Storage on the surface

    • Outflow delay

    • outflow_delay

    • decimal number

    • min-1

    • Outflow delay constant \(k_q\)

    • Infiltration

    • infiltration

    • boolean

    • -

    • Switches infiltration on or off

    • Min. infiltration capacity

    • min_infiltration_capacity

    • decimal number

    • mm/h

    • Equilibrium (minimum) infiltration rate \(f_c\)

    • Max. infiltration capacity

    • max_infiltration_capacity

    • decimal number

    • mm/h

    • Initial (maximum) infiltration rate \(f_0\)

    • Infiltration decay constant

    • infiltration_decay_constant

    • decimal number

    • h-1

    • Infiltration decay constant \(k_d\)

    • Infiltration recovery constant

    • infiltration_recovery_constant

    • decimal number

    • h-1

    • Infiltration recovery constant \(k_r\)

    • Tags

    • tags

    • text

    • No

    • -

    • Comma-separated list of foreign key references to ID’s in Tag