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The CHy e-Board is a virtual space where the Commission for Hydrology (CHy) community posts information of interest.
Appropriate posts for the CHy e-Board will include communications from the President, documents for discussion, announcements of forthcoming meetings etc, related to the work of the Commission for Hydrology. Whenever a particular document so requires, a discussion on “CHy Forum” will be undertaken.

All information is classified in categories, please select a category in the right-hand menu, to display the corresponding information (in brackets you will find the number of announcements posted under each category)

Recent posts

Mike Bonell: A Tribute from his Colleagues

The hydro-meteorological community around the world has lost a greatly valued and influential colleague with the untimely death of Professor Mike Bonell in Paris on 11 July 2014. Mike’s many colleagues and friends from across the world pass on their sorrow and sympathy to Mike’s wife and his daughters and their families at their and our loss.

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Towards the first HyCOS component in RAIII

Separating the French Overseas Department of Guiana and the Brazilian State of Amapá, the Oyapock River is a physical boundary between the American Continent and the European Community. This river rises in Brazil at the Tumucumaque Mountains and empties into the Atlantic Ocean, after traveling approximately 350 km throughout an area with little human interference.
The area of its basin is roughly 30,000 km², a large portion of which is in a natural preserved area that includes the Tumucumaque Mountains National Park in the Brazilian side (almost 9,000 km²), and the Guiana Amazonian Park in the French side (with approximately the same area of the park on the Brazilian side).
Therefore, it can be said that about sixty percent of the Oyapock river basin area is preserved.
In spite of the fact that France and, to some extent, Brazil are quite advanced in monitoring and evaluating their own resources, there is, in the particular case of the Oyapock basin, a significant lack of systems in surveying and processing raw data, in generating reliable information and in making them available in a timely way and with wide dissemination.
A regional initiative aiming at collecting and disseminating data and information is hugely important in the awareness of governments and local population in order to better leverage their resources. A key step in enabling the management of the water resources and the establishment of responsible and effective guidelines and policies concerning its uses is the development of a reasonable knowledge of these resources. For the development of this knowledge, it is imperative to implement an effective system of monitoring and sharing data and information between the Hydrological Services of both countries.
Besides the advantages for the region itself, the implementation of a HyCOS component in the Oyapock basin increases the possibility of accomplishing future HyCOS components in the RAIII, such as in the Amazon and in the Plata basins.
One day after the International Workshop on Hydrometrics, held in the Brazilian city of Manaus in May 2012, a meeting of representatives of the South American Hydrological Services was carried out. After this meeting, twenty-one points were thought of as the most relevant to South America, as far water resources are concerned.
The first of these points states that it is necessary to continue the effort to implement HyCOS components in South America.
In July 2013, there was a meeting in Brasilia with the participation of the ANA (National Water Agency of Brazil), the IRD (Research Institute for the Develpement of France) and the INMET (National Institute of Meteorology of Brazil). The participants concluded that the establishment of the system is of great importance for the region and agreed to make efforts to establish the necessary procedures for the creation of the HYCOS-Oyapock, and the consequent establishment of cooperation agreements and sharing of hydrometeorological data and information.
The next step to be carried out by ANA shall be to issue a letter of intent to DEAL-Guyana, to the National Bureau of Meteo France, to the IRD and to the WMO, in order to trigger the request stage for the creation of the first HYCOS component in RAIII.
Brasília/Brazil, 7th October 2013
Antônio Cardoso Neto
Hydrologic Advisor of the PR of Brazil

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Planning of Water Quality monitoring systems

The “Planning of Water Quality monitoring systems“ Technical report series (No 3) is now available for download.

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A Review of Applied Methods in Europe for Flood-Frequency Analysis in a Changing Environment

A new report entitled “A Review of Applied Methods in Europe for Flood-Frequency Analysis in a Changing Environment“ has been published as part of the COST Action ES0901 “European procedures for flood frequency estimation (FloodFreq).”  It provides a review of methods used and results of detection of trends in observations and climate projections of extreme precipitation and flood frequency in Europe.

In addition, in Appendix B reports from three non-European countries (Australia, India and the United States) are provided. These reports have been collected by the World Meteorological Organization (WMO) Commission for Hydrology as part of their 2008-2012 programme “Water, Climate and Risk Management”. The WMO Commission for Hydrology liaised with the FloodFreq project in June 2011 where it was decided to gather information from some WMO countries along the same lines as the reports being prepared by the FloodFreq member countries. The first reports from three countries are included in Appendix B.

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Extended hydrological prediction (EHP) – definition and case study template

Dear all,
First of all let me thank you for valuable inputs to the development of template for case studies. I have received few but they were very helpful. I attach the latest version of the template that I will introduce at AGU conference later this month. If you operate the EHP system I will really appreciate to fill the template and send it to me. In such case I will present it as an example there.

The second point is to try to define what the EHP is. The Melbourne 2011 meeting among others concluded that “Definition of exactly what is meant by EHP is essential, that is, the definition of EHP should be clear and concise, and thus well understood;
I have made a very first attempt to develop sort of definition. I consider it as a very preliminary thing and I would appreciate any comments on it especially if you feel the way of definition creation (the logic used) to be acceptable or at least going the right direction.

The first attempt of EHP definition:
Extended Hydrological Prediction (EHP) or Extended Streamflow Prediction (ESP) is the prediction of hydrological variables, most commonly the stream flow, for the period of time that exceeds the short term forecast lead time. At the same time the short term forecast is based on observed hydrological and meteorological variable (precipitation, air temperature, snow, discharges, soil moisture etc.) and optionally on the forecast of these variables, especially the quantitative precipitation forecast (QPF) for the period of its plausible performance1). The lead time of the short term hydrological forecast differs mostly based on catchment time of concentration. EHP uses the observed values of hydrological and meteorological variables together with other climatologic drivers often dealing with them in a stochastic or statistic manner. The lead time of EHP thus may differ from weeks to several months or years depending on the duration of the effect of the initial condition of the basin and the effect of other drivers used in EHP.

Note 1) The performance of precipitation forecast of NWP decline with the lead time. The use of the deterministic forecast beyond the time at which the efficiency is worse than the climatology does not make a sense. Therefore the ensemble systems are often used for longer lead time meteorological forecast – it is often named medium range forecast.

As you can see my feeling is there are generally four types of forecast according to lead time:
1 – Nowcasting for flash floods for few hours of a lead time
2 – Short term forecast covering typically few days up to app. 1 week. It is based on observation and short term meteorological forecast (Limited area models)
3 – Medium range forecast based on medium range meteorological ensembles like ECMWF or GFS (lead time roughly of 1 to 3 weeks)
4 – Extended hydrological prediction that is not based on individual (or ensemble) meteorological forecast but may use climatic drivers.

I am aware that some of you may have different feelings especially about the medium range forecast that might be considered to be a part of short term or extended hydrological forecast. I appreciate any comment. Thanks a lot.

Latest version of template for EHP case studies

Posted in AWG, Documents under discussion, Hydrological Forecasting and Prediction, Uncategorized, Water, Climate and Risk Management | Leave a comment