Category Archives: hydro10

RS MINERVE 2.0 : Early Access for Hydro10 members

An Early Access version of RS MINERVE 2.0 is now available for members of the Hydro10 Association, public release is scheduled in Fall 2015.

This version facilitates the management and connection of RS MINERVE to other systems and provides new functionalities and models for flood forecasting as well as hydraulics and hydropower engineering.

What’s New

Version 2.0.0 :

  • Graphic interface improved
  • New modular and extensible software architecture based on PRISM 5.0 and the Managed Extensibility Framework (MEF)
  • Channel routing models updated
  • Turbine and hydropower models improved
  • Integration of background images
  • In the GIS module: functions to create full hydrological models from shapefiles
  • Improved settings, with custom or predefined systems of units (SI International System, US Customary)
  • Command lines tasks enables to invoke Visual Basic (VB) scripts from a command prompt. This opens the door to a wide scope applications, including real-time simulations.

Requirements

  • Windows® 7 or later
  • Microsoft® .NET Framework 4.5 will be installed if not found

Related Links

To obtain RS MINERVE 2.0, please contact the Hydro10 committee:

Training “Hydrological-hydraulic modelling with RS MINERVE”

A course on hydrological and hydraulic modelling with RS MINERVE will take place on January 28 and 29 2015, at EPFL in Lausanne. The training is organized by the research centre CREALP, the Laboratory of Hydraulics Constructions (LCH) of EPFL, the Technical University of Valencia (UPV) and the Hydro10 Association.

The objective of this course is to provide foundational skills for hydrological-hydraulic modelling and to understand related problems.

First, the basics of hydrological systems will be presented for the interpretation of modelling results. Then, the RS MINERVE software is introduced to participants on the basis of a practical case study. Participants learn to approach modelling problems as a whole, from the definition of the hydrological basin to the calculation and analysis of simulation results.

The training will be given in french.

More information about the course: Formation RS MINERVE

More information about the software: rsminerve.hydro10.org

 

 

Q347, what is it and what are its issues?

The term “Q347” was introduced in the Federal Water Protection Act (WPA) in 1992 in order to quantify the concept of “low water flow”. Article 4 of the WPA defines Q347 as “the flow rate which, averaged over ten years, is reached or exceeded on an average of 347 days per year and which is not substantially affected by damming, withdrawal or supply of water”.

This flow rate is mainly used to define the minimum flow that has to be guaranteed in a river at any time of the year if hydraulic projects are to be undertaken. In practical terms, it means that after construction of any hydraulic structure that could have an impact on the river flow (for example a dam or a water catchment), a residual flow should always be guaranteed. The minimum threshold for the residual flow is determined proportionally to the value of Q347, as explained in chapter 2 of the WPA. The maintenance of an adequate residual flow is necessary in order to preserve the health of watercourses, since a stream with a low flow is particularly vulnerable to disturbances. It will be easily affected by high temperatures, which cause a decrease in the dissolved oxygen present in the water. The contamination of a stream with a low flow rate is also more damaging because the presence of the pollutant would be in much higher concentration.

How to calculate Q347 ?

The WPA does not explicitly explain how to calculate the Q347 for a given watercourse, but a publication by the Federal Office for the Environment (FOEN, 2000) gives some indications: The calculation of the Q347 has to be based on average daily flows. The daily flow variability is not taken into account. The simplest way to determine the Q347 is to produce the flow duration curve (FDC) for a period of ten years and extract the flow rate that is reached or exceeded 95% of the time (equivalent to an average of 347 days per year). Practically, you have to sort the average daily flows in descending order, assign a rank to each and calculate the annual frequency for each value as follows:

fr = 365 · r/N

with: fr the annual frequency (in number of days), r the rank and N the number of daily mean discharge data.

Finally, the discharge value corresponding to the Q347 is the mean daily flow rate with an annual frequency fr of 347.

However, some caution must be taken. It is important to have a large period of data to ensure a statistically significant Q347. A trend in the data, for example due to climate change, can affect the calculation. In these cases, the FOEN advises to only use the ten most recent years of data for the calculation.

When no sufficient data is available for the calculation of Q347, there are some methods to approximate it. For example it can be extrapolated with correlated data that covers a larger stretch of time. However, the results of these estimation methods should be considered with precaution. Low water flow rates are extremely variable in both space and time, and the behaviour of one basin cannot usually be applied to another basin.

For more detailed information on this problematic and about the Q347, we highly encourage you to take a look to the two following publications of the FOEN:
–  « Débits résiduels convenables – Comment peuvent-ils être déterminés? », instructions, 2000, Office fédéral de l’environnement OFEV
–  « Le débit d’étiage Q347, état de la question », 1999, Office fédéral de l’environnement OFEV

References:
–  OFEFP (2000). « Débits résiduels convenables – Comment peuvent-ils être déterminés? ». Instructions de l l’Office fédéral de l’environnement, des forêts et du paysage (OFEFP), Berne, VU-2701-F.
–  Service hydrologique et géologique national (1999). « Le débit d’étiage Q347, état de la question »,Office fédéral de l’environnement, Berne, LHG-27-D.

 

New AQUATOOL website of the Hydro10 Association

The Universitat Politècnica de València (UPV), as active member of Hydro10, has developed a new website about AQUATOOL tool (aquatool.hydro10.org).

AQUATOOL is a generalized Decision Support System Shell for water resources planning and management. It includes different calculation modules, for example, to simulate the system management or to evaluate the water quality in rivers and reservoirs.

In this new website, you can find more information about the tool and the latest downloads.

Welcome to the new website of the Hydro10 Association

In this web site, you will find all the relevant information about the association, its objectives, the supported techniques and tools and its projects.