Node Data Editor

Nodes are points of a conveyance system that connect conveyance links together. Nodes are also the points where external inflows can enter a drainage system.

The node data editor allows you to input or edit node and inflow data. It also includes a page which displays the results relating to the node.

Use the arrow buttons to page through the database, or click the record number button to search for a particular node or record number.

Option	Description
Arrow Buttons	Click the arrow buttons to scroll between the node records. The two outer arrows scroll to the first and last record.
Delete/Recall Button	This button marks the current record for deletion, or if it has already been deleted it will remove the deletion flag. Deleted records are only removed from the database when you close the project and answer Yes to the question "Do you want to remove deleted records". Once the database has been packed it is impossible to recover the deleted records.
Record Number Button	Click the button that displays the current record number, i.e. the button that displays 00001:00075, to search for a specific record.
Show Button	Click to move the mouse cursor to the specific node for that record. The window also automatically zooms into the area around that node.
Close Button	Click to close the window.

Node

Option	Description
Node Name	The name or reference to this node and outgoing link in up to 25 alpha-numeric characters. Searches can be performed on these names.
Overflow Node	The name of the node to which overflows must be directed. This is optional. If no overflow node is specified all overflows will be taken into local storage.
Outflow Link	The name of the link that this node discharges into.
Cover Level (m)	The level of the node (manhole) cover in metres.
Lock	Option to lock the cover level to the specified level.
Freeboard	Height that the manhole cover must be above the extracted cover level.
Manhole Conditions	The state of the node invert. This may be one of the following settings: Drop - Links placed at minimum slope. Invert - Links placed with incoming and outgoing invert levels common. Soffit - Links placed with the inside top of the culvert common. 0.075 - An absolute step between the invert levels of the incoming and outgoing links.
Minimum Cover	The minimum cover to the link at this node.
Manhole Type	Select a manhole type from the list. Manhole types are defined in the Default Settings.

Illudas Runoff

Option	Description
Subcatchment	The subcatchment can be selected from a list. The runoff area is then calculated from the subcatchment polygon. The subcatchment option is not active if the area is locked.
Lock	Option to lock the runoff area to the specified area value.
Runoff Area (ha)	The total contributing runoff area in hectares. The Runoff Area option is not active when a subcatchment is selected, since the area is calculated from the subcatchment polygon.
Paved Area (%)	The percentage of the sub-catchment that consists of impervious material.
Paved Area Entry Time (min)	The paved entry time is the time it takes the runoff from the paved area to run along a gutter with a hydraulic radius of 60mm and a Manning factor of 0.02 to the inlet. The overland flow time for the runoff to reach the gutter is assumed to be two minutes, which is added to the gutter travel time. Click ... to display the entry time calculator.
Paved Depression Storage (mm)	The average losses in millimetres due to surface irregularities in the paved area.
Supplementary Area (%)	The percentage of the sub-catchment that consists of impervious material, which discharges onto a permeable surface i.e. roofs that discharge onto a lawn.
Grassed Entry Time (min)	The time, in minutes, for a drop of water to travel from the furthest part of the grassed zone to a point on the contributing paved area or to the stormwater inlet if the contributing paved area is zero. Click ... to display the entry time calculator.
Grassed Depression Storage (mm)	The average losses in mm due to surface irregularities.
Soil Type	The soil classification which determines the rate of infiltration.
Inflow Hydrograph	The name of the inflow hydrograph file.

Rational Runoff

Option	Description
Lock	Option to lock the runoff area to the specified area value.
Runoff Area (km2)	The total contributing runoff area in square kilometres. The Runoff Area option is not active when a subcatchment is selected, since the area is calculated from the subcatchment polygon.
Subcatchment	The subcatchment can be selected from a list. The runoff area is then calculated from the subcatchment polygon. The subcatchment option will not be active if the area is locked.
Time of Concentration (hours)	The time it takes for a drop of water to travel from the most distant part of the catchment to the catchpit. Click ... to display the Time of Concentration calculator.
User Specified Point Rainfall	Select if the Rational Runoff calculations must not calculate the Point Rainfall value from the standard Rational Runoff graphs, but must make use of the entered value.
Catchment Characteristics
Rural Percentage	The rural portion of the catchment area expressed as a percentage of the total area.
Rural Factor	The rural area runoff coefficient, which can be calculated using the rural coefficient calculator.
Urban Percentage	The urban portion of the catchment area expressed as a percentage of the total area.
Urban Factor	The urban area runoff coefficient, which can be calculated using the urban coefficient calculator.
Lakes	The percentage of the catchment area consisting of lakes or ponds which do not contribute to runoff.
Inflow Hydrograph	The name of the inflow hydrograph file.

Wallingford Rational Runoff

Option	Description
Lock	Option to lock the runoff area to the specified area value.
Catchment Area (km2)	The total contributing runoff area in square kilometres. The Runoff Area option is not active when a subcatchment is selected, since the area is calculated from the subcatchment polygon.
Subcatchment	The subcatchment can be selected from a list. The runoff area will then be calculated from the subcatchment polygon. The subcatchment option is not active if the area is locked.
Percentage Impervious Catchment (PIMP)	The percentage of the catchment area covered by impervious surfaces intended to drain to the storm sewer.
Time of Entry (min)	The time it takes for a drop of water to travel from the most distant part of the catchment to the catchpit. Click ... to display the Time of Entry calculator.
Previous Pipe Length (m)	The length of pipe between the upstream sub-catchment and this sub-catchment.
Previous Pipe Velocity	The calculated flow velocity in the pipe between the upstream sub-catchment and this sub-catchment.
Time of Flow (min)	The time of flow through the previous pipe to the point under consideration. Calculated from the pipe length and velocity.
Time of Concentration	The time of concentration is equal to the sum of the time of entry and the time of flow.
Soil Type	The soil index SOIL is based on the Flood Studies Report and can be obtained from the revised soil map covering the whole of the United Kingdom. The index takes one of the values 0.15, 0.3, 0.4, 0.45, 0.5 according to the five soil types - 1 to 5 respectively.
Inflow Hydrograph	The name of the inflow hydrograph file.

SWMM Runoff

Option	Description
Subcatchment	Specify which subcatchments drain to this node. Click Edit to open the Subcatchment Editor.
Inflows	Displays YES if there are inflows into this node; and NO if there are none. Click ... to display the Inflows Editor.
Treatment	Displays YES or NO to indicate if treatment functions have been assigned to this node. Click ... to display the Treatment Editor.

Control

Option	Description
Fixed Invert (m)	The fixed invert level of this node.
Maximum Inflow (m3)	The flow into the link can be limited to a specific value, regardless of the capacity of the link. This can be caused by the size of the inlet structure.
Maximum Storage (cubic m)	If no overflow node is specified, the analysis module assumes that excess link flows will be taken up in some form of local storage i.e. a surge tank. In many instances, you want to take a specified volume of flow up in local storage, and then pass the excess flow on to an overflow node.
Node Y Coordinate	The Y coordinate of the node or manhole.
Node X Coordinate	The X coordinate of the node or manhole.

Results

Option	Description
Node Invert	The calculated invert level of the node.
Node Depth	The calculated difference between the node cover level and the node invert.
Cover	The cover to the outgoing link.
Inflow	The inflow into the node.
Overflow	The overflow from this node to the overflow node (if any).

Delete/Recall

This button marks the current record for deletion; or if it has already been deleted it removes the deletion flag. Deleted records are only removed from the database when you close the project and answer Yes to the question "Do you want to remove deleted records". Once the database has been packed it is impossible to recover the deleted records.

Find

Click the button that displays the current record number, i.e. the button that displays 00001:00075, to search for a specific record. After finding the record, click Show to move the mouse cursor to the specific node for that record. The window also automatically zooms into the area around that node.