Reservoirs are node elements in InfoWater Pro that remain at a constant water level irrespective of the flow unless they are specified as variable-head reservoirs (EPS only).  Reservoirs have unlimited volume and are generally used to represent a lake or other inexhaustible supply source. Reservoirs can also receive water and act as a "sink" where water can be sent. They differ from Tanks in InfoWater Pro in that Tanks represent true storage nodes within InfoWater Pro and generally have a fixed volume of storage.  Reservoir nodes must specify a Type (Fixed Head or Variable), a Head value in ft (m), and if necessary for a Variable Type a Pattern representing the change in head value in an EPS run.

How do I...

Create a Reservoir Node?

To create a Reservoir node, do the following:

Click on the InfoWater Pro Ribbon in the Edit Group using the  Insert Command dropbox  .  

Select the Insert Reservoir icon  from the  Insert Command dropbox  


When the Insert Reservoir command is the active command it will be highlighted in Blue as shown:

Once the command is initiated, select the location of the new node by left mouse clicking anywhere on the map display. Suggest a new ID and/or a description on the Reservoir Identification dialog box and click on the OK button to accept the ID and create the new Reservoir. The Reservoir should visually appear at the specified location. If the insert location is near an existing model pipe the software will ask if you wish to insert the Reservoir into that pipe. If you wish to split the pipe, the Reservoir Identification dialog box for the new Reservoir and the new pipe will appear in a pop up window.

You can also use the Digitize Network icon from the  Insert Command dropbox  to create a pipe and node network "on the fly".  Once digitized, the user is able to add relevant modeling data in the Model Explorer - Attribute Tab window or via the DB Editor.

Types of Reservoirs?

There are 2 different types of Reservoirs  the user is able to input in InfoWater.

Fixed Head Reservoir

For Fixed Head Reservoirs, only the Head field needs to be entered. Specify the Reservoir Type as Fixed Head Reservoir in the Type field of the Model Explorer - Attribute Tab window. The head represents the total driving head of water in the Reservoir and typically equals the surface elevation of water in the reservoir measured from mean sea level. Ex: 500 ft(m).

Note: The Pattern field must be left blank for Fixed Head reservoirs.

Variable Head Reservoir

In cases when the driving head may vary with time, Variable Head Reservoirs may be used. Variable head reservoirs contain an inexhaustible supply of water but the driving head or water surface elevation is time variant such as in the case ground water wells for instance. Variable Head reservoirs can be used only during Extended period simulations. Specify the Reservoir Type as Variable Head in the Type field of the Model Explorer - Attribute Tab window. For Variable Head reservoirs a Pattern needs to be specified to define the variation of the head with time. See the Help for Patterns to see an example pattern.

Note: For Variable Head reservoirs, only the Pattern field needs to be specified. Do not define a value for the head field.

Patterns for Variable Head Reservoirs

Supposing a water system has a reservoir with a variation in elevation head or pressure head throughout the day - a pattern can be assigned to that reservoir.  In every other case for a Pattern (except a variable head reservoir), the pattern is used as a multiplier to the base data.  With a variable head reservoir, the pattern itself represents the water surface elevation or Head of the reservoir over a given time period (see graph).

To assign a pattern to a reservoir, highlight the reservoir and view its attributes under the Modeling section of the Model Explorer - Attribute Tab.  Under the modeling section,  select the Pattern drop down box and choose the appropriate pattern to assign to the reservoir. Alternatively, you can directly open up the Pattern Editor by double clicking on the word "Pattern in the Modeling section of the Model Explorer - Attribute Tab and select or create a new pattern in the pattern editor and with the desired Pattern selected hit the "OK" button to select that pattern to be used.

Edit a Reservoir?

Graphic Selection - To select a Reservoir node for data edit do one of the following:

Choose the Select icon  from the Model Explorer - Attribute Tab window and click on the specific Reservoir or select the InfoWater Pro Ribbon in the Edit Group using the  Select icon 

If a Reservoir has been prior selected and is a part of the Browse history, it can be re-selected by choosing it from the Browse-History section of the Model Explorer - Attribute Tab window.

Data Edit - To edit the data related to a Reservoir, first select the Reservoir using the tools above. Once selected, edit Junction related data by adding/modifying the fields in the Model Explorer - Attribute Tab window.  Additionally modifications may be done by editing the DB Tables that may be accessed from the InfoWater Pro Ribbon in the Edit Group using the  DB Editor icon  .

Graphic Edit  - To edit the node graphically do one of the following: From the  InfoWater Pro Ribbon in the Edit Group using the  Edit Command dropbox icon  select the Move Node command  from the dropdown . Left click on the mouse and hold the left click down on the junction to select it. With the junction highlighted move the node to the desired position while keeping the left click mouse button depressed. Once in the desired location, release the left mouse button and the node location will be updated to the new location.

When the Move Node command in the InfoWater Pro Ribbon in the Edit Group  Edit Command dropbox is the active command it will be highlighted in Blue as shown: 

If the user has not enabled "Auto Length Calculation" checkbox  under the InfoWater Pro Ribbon in the Project Group using the Preferences icon  and the Operations tab, all pipes connected to a node moved will not have their lengths automatically changed.

Edit the Data for a Group of Reservoirs?

Group edits can be made by either creating a domain or by creating a selection.

Using the Domain Manager - Create a domain selecting the specific Reservoirs that you want to edit. Refer to the section on Domain Manager for details on the domain creation process. Once the domain has been created, choose the InfoWater Pro Ribbon in the Edit Group using the  DB Editor icon . Depending on the data you want to edit choose the appropriate table type from among the different database tables. Choose as the Data Scope and click on OK.

Using the User Selection - Select choose the InfoWater Pro Ribbon in the Edit Group using the  DB Editor icon .  Depending on the data you want to edit choose the appropriate table type from among the different database tables. Choose as the Data Scope and choose the User Selection  command. This places the software in User Selection Mode.  In InfoWater Pro, the Selected elements will be in a cyan color.  Once all of the desired Reservoirs are selected, right click and choose Enter to access the DB Tables for the selected Reservoirs.

Once the specific tables have been opened with the desired scope, enter data one cell at a time or Block Edit data to make changes in bulk to multiple cells.

Group Editing for certain specific features may also be done by choosing the Group Editing icon  or the Edit Domain icon  under the InfoWater Pro Ribbon in the Edit Group . Refer to the sections on Group Editing and Edit Domain to learn more.

Delete a Reservoir?

To delete a Reservoir, select the Delete Node option  in the InfoWater Pro Ribbon in the Edit Group  Edit Command dropbox. Select the node to be deleted and InfoWater prompts the user to confirm deletion (if the Delete Confirmation checkbox  is checked in the Operation Settings tab in the Preferences settings .

The active selected Reservoir in the Model Explorer - Attribute Tab window may also be deleted by selecting the Delete icon  with the InfoWater prompt to confirm element deletion.

All pipes attached to the Node being deleted will also be deleted if the Auto Pipe Delete checkbox  is checked in the Operation Settings tab in the Preferences settings .  The Node and associated pipes are deleted and saved in the InfoWater Pro recycle bin and can be recalled from the database using the Model Explorer - Command Center Tab under Utilities -> Recall (Node or Pipe) command. However, if Auto Database Packing  is checked (Operation Settings tab in the Preferences settings ), then any element deleted is permanently deleted from the database and cannot be recalled. Deleted elements can be recalled until the Pack and then Clean commands (found in the Model Explorer - Command Center Tab under Utilities Database menu list)are completed which removes deleted element ID's from the database.

Recall a Deleted Reservoir?

To recall a deleted Reservoir, go to Model Explorer - Command Center Tab under Utilities -> Recall and select the Node command. In order to perform the recall, the user must know the ID of the Reservoir that was deleted. You may choose the Show Deleted Node command to obtain a list of  nodes deleted from the InfoWater project but saved in the InfoWater recycle bin. Deleted elements can be recalled until the Pack and then Clean commands (found in the Model Explorer - Command Center Tab under Utilities Database menu list) are completed which removes deleted element ID's from the database permanently.