Speicherfenster/en

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The data sheet for the reservoir can be opened by double clicking on the element symbol in the system plan or by right clicking → Properties.

It has the two tabs Properties and Settings for simulation.

Properties

Datei:Speicherfenster Eigenschaften Bereiche EN.PNG

The properties tab of reservoir elements is divided into different sections (from top left to the bottom right):

• internal dependencies
• releases
• limits
• base data
• sequences
• rating curves
• loss/external contribution (precipitation, evaporation, infiltration)

In the following, these are discussed in the order in which they are reasonably processed.

Base Data

When creating a new reservoir for the first time, a window containing the base data describing the reservoir appears. Later, the window can be opened by clicking the button Base Data in the upper right corner of the reservoir window. The most important characteristics of the reservoir should be entered here.

The terms for reservoir elements are conceptualized for dams, as the system element was originally developed as a dam element. Thus, for dams, the height and the content are entered for the following positions:

• Bottom (content=0)
• Spillway
• Crest (maximum storage)

For all other reservoirs, instead of the storage volume at crown height, a fictitious value can be specified as the maximum storage. This value will then never exceeded in the model.

It is helpful to complete the base data right at the beginning and to adjust all additional functions in the reservoir element (e.g. rating curve, or function of the spillway) exactly to this base data. If the maximum storage is changed later, you can choose from two options at the bottom of the window on how to proceed with the additional functions of the reservoir element. Either the function values of all functions are adjusted according to the percentage change of the maximum storage volume or the function values are kept unchanged. Choosing the latter option, all supporting points larger than the new maximum storage volume are discarded. Whichever option is chosen, it is important to check all functions for coherence with the desired outcome!

Rating Curve

After entering the base data, it is reasonable to enter the rating curve next. To do this, activate the checkbox next to the (initially grayed out) symbol for the rating curve at the bottom left of the window. Later, the rating curve can be edited by clicking the icon. Deactivating the check box deletes the rating curve again.

The rating curve compares the storage volumes in the reservoir with the respective water levels and the water surface. When entering the data, it is important to note that the height and storage volume data must be consistent with the positions for the bottom, spillway and crown that have been entered in the base data section. The first supporting point is always storage volume: 0 | height: bottom height | surface: 0. The last supporting point is storage volume: maximum storage | height: crown height | surface: corresponding maximum surface.

Release

Creating a New Release

To create a new release, click the button Create new release in the section Releases of the reservoir window. Afterwards a window appears, in which the class and the type of the release can be selected and a corresponding name can be assigned.

The class of the release can be chosen from Q, adjustable release and K, non adjustable release. The following options are available:

Identifier	Term EN	Term DE
A	Release	Abgabe
W	Water supply	Wasserversorgung
R	Standard release	Regelabgabe
H	Spillway	Hochwasserentlastung
S	Flood control area	Hochwasserschutzraum
M	Minimum release	Mindestabgabe
N	Low flow augmentation	Niedrigwasseraufhöhung
T	Turbine	Turbine
B	Industrial supply	Brauchwasser
U	Water transport system	Überleitung
D	Dynamic release	Dynamische Abgabe

The selection of type, class and name is mainly informative. The user himself is responsible for entering the data for releases afterwards. The identification of the release is made up of three digits: the first letter is determined by the selected class, the second by the selected type. These are then followed by a unique number in the third position, which is assigned corresponding to the order of the creation of the releases and their classes and types. The release identification determines how the simulation results are stored and how the releases can be utilized for the definition of system states. For this purpose, the release identifier is attached to the respective system element identifier with an underscore, e.g., T100_QA1.

After the delivery has been created, a box with the respective release identification appears in the memory window in the section Releases.

Editing Releases

An already created release can be edited by double-clicking the box showing the release ID in the Release section or by right-clicking the box → Edit. A new window opens.

Enabling/Disabling Releases

At the left of the release ID box there is a checkbox that can be used to activate and deactivate the release. Disabled releases are not taken into account in the simulation.

Deleting Releases

A release can be deleted by right-clicking on the release identifier to open the context menu and to select delete.

Outlets

Newly created releases do not yet have an outlet from the reservoir. Therefore an allocation to an outlet has to be established first. If the reservoir element in the flow network map is already connected to other system elements, the connected elements and their identifiers appear in the Outlet section on the right side of the window. A release is now assigned to an outlet by connecting them via drag&drop. To do this, drag (by holding a left-click) the box with the release identifier onto the box with the outflor identifier. The created connection is displayed with an arrow. Similarly, an existing connection can be deleted. One outlet can be comprised of several releases.

Limits

Creating New Limits

To create a new limit for a hydraulic feature, click the button Create new limit in the reservoir window in the Limits section. After that a window appears in which the identification of the limit can be selected and a name assigned.

The following limit types are available for hydraulic features:

Identifier	Term EN	Term DE
G	Bottom outlet	Grundablass
B	Service outlet	Betriebsablass
A	Outlet	Auslass

The selection of the type and the input of the designation is mainly informative and does not affect the calculation. The identification of limits is made up of three digits: the first letter is always "G", the second is determined by the selected type. These are then followed by a unique number in the third position, which is assigned corresponding to the order of the creation of the limits and their classes and types.

After the limit has been created, a box with the respective identification of the limit appears in the reservoir window in the section Limits.

Editing Limits

An already created limit can be edited by double-clicking on the identifier box in the limits section or by right-clicking on the identifier -> Edit. A new window opens for this purpose:

Here the minimally permitted outflow flowing through the hydraulic features can be entered. After clicking the Function button, the storage-outflow-function can also be entered as a limit function.

Assigning a Release to a Limit/ Deleting Allocations

A release can be assigned to a limit by drag&drop. For this purpose, the box with the release identifier is dragged onto the box with the limit identifier. The connection is displayed with an arrow. Similarly, the connection can be deleted again.

Deleting Limits

To delete a limit, right-click on the boundary and select → Delete from the context menu.

Internal Dependencies

Creating New Internal Dependencies

To create a new internal dependency of two releases, connect the two releases by dragging and dropping. To do this, drag the box with the release identifier providing the condition for the reduction onto the box with the release identifier modified by the reduction. The connection is represented by an arrow. One release can reduce several other releases, for this purpose several connections are created from this release.

Editing Internal Dependencies

To edit an already created internal dependency, first select the release providing the condition for the reduction and then click the button Edit Int. Dependency . Alternatively, after right-clicking on the release, select -> Edit internal dependency from the context menu. After that a window appears

In the window that appears, you can enter the value that the release must exceed and the storage content must fall below in order to trigger a reduction of the other releases. The entry is made as a constant value, if necessary scaled with a hydrograph, which can be selected from the corresponding drop-down lists. At the bottom of the window the arrow buttons can change the order in which the release are to be reduced.

The order in which the deliveries are to be reduced can also be adjusted in the window that opens when you click the Sequence button from the save window.

Loss/ External contribution

External contribution/ losses at the reservoir in the form of precipitation, evaporation and infiltration can be entered in the lower area of the reservoir window. For this purpose, the checkbox next to the respective symbol is activated and a new window appears. This window can also be opened later by clicking on the symbol of the loss/subsidy.

Calculation method

The loss/external contribution term term can be entered either as a constant hydrograph (Attention: Designation in the GUI: Function (Btr.Rule)) or as a time series (Attention: Designation in the GUI: Function + File), if necessary scaled with a factor. Regardless of the selected calculation method, the storage loss/external contribution is automatically scaled with the current storage surface.

Simulation settings

In the Simulation Settings tab of the reservoir window, the initial conditions for the reservoir are set:

The initial reservoir content [Tsd.m³] can be entered in a text field. For orientation, the maximum content of the storage element is shown directly below. With the input the graphic with the filling level of the dam in the middle area of the window adjusts automatically and the filling level is output in percent.

For all substances already defined, the initial concentration [mg/l] is also specified here. To do this, select the substance from the drop-down list and enter the initial concentration in the text field next to it. It is important to click the Apply button afterwards , otherwise the entry will be lost when closing. If the button is not clicked after the change, a message window still appears, but the Yes button is inactive, i.e. it is not saved.

At the bottom of the window there is also the possibility to read the start value for the content from a time series. The value in the time series at the start of the simulation is set as the start value for the initial content. The selection of the time series from the Time series management is done via the button Selection . Via the button Display a window with a Graphics of the time series opens.