GIS-IDs: List of associated IDs on the GIS/data-source side.
Hyperlinks: Associate one or more web link, photo, word processing document, or other file with this element.
Diameter (Orifice): Specifies the diameter of the tank inlet orifice. Only used by the transient engine.
Ratio of Losses: Ratio of the head losses for equal inflows to / outflows from the tank via the orifice. Default value is 2.5.
Headloss Coefficient: Applies to flow from the tank to the pipe/riser. This must be a positive number.
Surge Tank Type: Choices: Simple, Differential
Has Check Valve?: Specify whether there is a check valve installed on the tank inlet/outlet. For the case of steady state and EPS simulations, a surge tank with a check valve is simulated as a pressure junction.
Diameter (Internal Riser): This is the upper riser.
Elevation (Top of Internal Riser): The top of the upper riser.
Elevation (Junction of Risers): Elevation at which the external and internal risers meet.
Diameter (External Riser): This is the lower riser.
Elevation (Orifice from Internal Riser to Tank): Elevation of the internal riser orifice.
Elevation (Top of Tank Base): The elevation of the top of the hemisherical base of the tank. For a cylindrical tank, this is equal to the pipe elevation.
Weir Length: The width of the weir.
Treat as Junction?: Specifies whether or not to treat the surge tank as a junction in steady state and EPS simulations.
Elevation (Base): Elevation of the storage tank base used as a reference when entering water surface elevations in the tank in terms of levels.
Elevation (Maximum): Highest allowable water surface elevation or level. If the tank fills above this point, it will be automatically shut off from the system.
Level (Maximum): A reference level to compare the hydraulic grade in the tank. Does not influence the calculations.
Diameter: Diameter of tank with constant circular cross-section.
Area (Average): Cross-Sectional area of tank for constant x-section tanks.
Volume Full (Input): full active volume of the variable area tank (i.e., the volume at 100% depth), exclusive of any inactive volume.
Operating Range Type: Choices: Elevation, Level
Section: Choices: Circular, Non-Circular, Variable Area
Cross-Section Curve: Defines a curve which specifies the relationship between depth and volume.
Specify Local Bulk Rate?: If true than a local Bulk Reaction Rate can be specified for the tank, otherwise the bulk reaction rate associated with selected constituent will govern.
Bulk Reaction Rate (Local): Coefficient defining how rapidly a constituent grows or decays over time.
Tank Mixing Model: Choices: 2-Compartment, Completely Mixed, FIFO, LIFO
Compartment 1: Percent of available storage that makes up the first compartment. Inflow and outflow is assumed to take place in the first compartment.
Compartment 2: Percent of available storage that makes up the second compartment. The second compartment receives overflow from the first, and this overflow is completely mixed.
Elevation (Minimum): Lowest allowable water surface elevation or level. If the tank drains below this point, it will be automatically shut off from the system.
Volume (Inactive): The inactive volume of the tank. This volume is the inaccessible volume of the tank that is below the tank active operating range and can become important in water quality simulations subject to the selected mixing model.
Level (Minimum): Lowest allowable water surface elevation or level. If the tank drains below this point, it will be automatically shut off from the system.
Elevation (High Alarm): The elevation above which the high level alarm is generated. Calculation notifications are produced to advise you of any alarm level violations.
Level (High Alarm): The level above which the high level alarm is generated. Calculation notifications are produced to advise you of any alarm level violations.
Elevation (Low Alarm): The elevation below which the low level alarm is generated. Calculation notifications are produced to advise you of any alarm level violations.
Level (Low Alarm): The level below which the low level alarm is generated. Calculation notifications are produced to advise you of any alarm level violations.
Use High Alarm?: Specifies whether or not to check high alarm levels during Steady State/EPS calculation and generate messages if the levels are violated.
Use Low Alarm?: Specifies whether or not to check low alarm levels during Steady State/EPS calculation and generate messages if the levels are violated.
Elevation (Initial): Starting water surface elevation/level in the tank.
Level (Initial): Starting water surface elevation/level in the tank.
Installation Year: Specify the install year of the element. It does not affect the calculations.
Elevation (Initial, Transient): Enter a value only if a check valve is installed (i.e., case of a one-way surge tank), or there is an initial inflow/outflow head loss. By default, the intial water surface level is taken equal to the head in the adjacent pipe.
Report Period (Transient): Number of time steps between successive printouts of operation. By default, this printout is suppressed.
Demand Collection: A collection of baseline demands and associated temporal patterns.
Unit Demand Collection: A collection of unit demands, associated unit counts, and temporal patterns.
Elevation: Elevation at centroid of junctions, valves, and pumps; the ground elevation at tanks; the hydraulic grade at reservoirs.
Trace (Initial): Specify the initial trace amount at the current location.
Zone: Specify the zone for the element.
Concentration (Initial): Specify the initial concentration for the global concentration at the selected element.
Is Constituent Source?: If true then the selected node can inject a set concentration of the global constituent into the system.
Pattern (Constituent): Specify the pattern which dictates how the injected constituent concentration varies over time.
Concentration (Base): This data field allows you to specify the corresponding constituent concentration at this node over time.
Mass Rate (Base): This data field allows you to specify the corresponding constituent mass rate at this node over time.
Age (Initial): Specify the initial age of the fluid at the selected element.
Volume Full (Calculated): The full active volume of the tank between the limits of the defined operating range, exclusive of any inactive volume.
Level (Calculated): Difference between calcuted hydraulic grade and the base elevation of the tank.
Volume (Calculated): Total volume of fluid in tank including the inactive volume.
Percent Full: The ratio of tank active volume to the calculated tank full active volume. Active volume is the tank volume within the operating range and is exclusive of inactive volume.
Status (Calculated): Choices: Empty, Emptying, Filling, Full, Stagnant
Flow (Out net): Net flow out of the element.
Flow (In net): Net flow into the element.
Demand Adjusted Population: Population of area supplied by current node. This value is derived from the unit demand loads applied to the collection and their equivalent populations.
Hydraulic Grade: Calculated hydraulic grade at node.
Age (Calculated): Age at selected element for current time step.
Trace (Calculated): Trace at selected element for current time step.
Concentration (Calculated): Concentration at selected element for current time step.
Has Calculation Messages Now?: If true then the current element has associated calculation warning messages for the current time step.
Head (Maximum, Transient): Maximum head at node over the course of the transient simulation.
Head (Minimum, Transient): Minimum head at node over the course of the transient simulation.
Pressure (Maximum, Transient): Maximum pressure at node over the course of the transient simulation.
Pressure (Minimum, Transient): Minimum pressure at node over the course of the transient simulation.
Air Volume (Maximum, Transient): Maximum air volume at node over the course of the transient simulation. Not applicable to Reservoirs and Rating curves.
Vapor Volume (Maximum, Transient): Maximum vapor volume at node over the course of the transient simulation. Not applicable to Reservoirs and Rating curves.
