Here you can find the most frequently asked questions about the programs related with river water development.
FLUSS
FLUSSPLOT
FLUSS
Which profile is considered as the initial profile with the hydraulic computation, if the profiles are stationed against the direction of flow?
The hydraulic computation begins always independently from the lowest profile in the project, with which stationing direction the profile data are collected. In other words: for station, against the flow direction, the initial profile is taken with the smallest Kilometer and for the stations in flow direction, the initial profile is taken with the largest Kilometer. For this profile, the initial water level must be entered with the hydraulic computation.
Why are the results of the single profile computation not always identical to the results of the continuous computation of profiles?
With the continuous computation of profiles for the determination of the water level, the energy gradient line calculated by the program on the basis the data is used. Since the energy gradient line is unknown during the single profile computation, the bottom slope is considered instead. One must enter this parameters before the computation. If the entered value deviates from the actual energy gradient line, the result will also deviate.
How can one consider the curvature loss in the case of meandering?
In version RIVER 8.1, it is possible to consider the curvature loss. This is made by the increase of the drag coefficient and is therefore only realizable with Darcy Weisbach procedures. During the data entry, it is necessary to enter the relative runing curvature ratio Sm, given by Sm = lm ⁄ lw with lm = the outer meander length and lw = the centerline length of the meander. As an information, the parameter Sm must always be larger than or equal to 1.0. With the parameter Sm in the program as according to BWK instruction, September 1999 the correction parameter is computed internally.
How can one define any level reference?
In FLUSS, further possibility is available to assign the elevation units apart from the units like m+NN and m+HN. If you select the option Others in the the parameter Elevation , then an input field for the elevation unit defined by the user appears. As as default, the new elevation is displayed as "m+NHN", which can be changed as according to your desire. Please note that regarding the compatibility with the previous expression, the number of indications is limited to 5.
Why is the calculated water level of a closed profile in the graphics misrepresented?
The fact might be that the profile coordinates were possibly taken in a wrong order. The profile coordinates of a closed profile must be always adjusted in the anti- clockwise direction. Furthermore the data acquisition must be started from the maximum elevation.
FLUSSPLOT
How can one hide the unused legends and symbols in the project?
Here, only the longitudinal profile is considered. In the input form of the longitudinal section, there are four tabs. In the fourth tab legend , you can find the selection boxes buttons for the legends to be displayed. Here you can adjust as according to necessity. However, the selection for the particular project has no effect on other projects.
How can the line color of the title block be defined?
The line color in the corresponding titleblock can be defined independently. For this, you can do from the menu Titleblock| Edit . Click the right mouse button on the grey area in the mask, it displays a context menu with various functions. Select lines define , then all the current pre-defined types are defined. There, you can use the line color and thickness as per your requirement.
Why is only a part of the drawing (profile) visible in the preview window, although the drawing size is smaller than the paper size ?
It might be that you have additional features such as discharges, levels or bridge level defined in the profile list , but the elevation of any parameter is by mistake entered wrongly, which are much higher or much lower than the normal profile elevations. In this case, much larger space is needed to draw than the actual drawing size. Therefore, we may have a part of the drawing outside the preview window.