Asian Pacific Flow Regimes from International and Experimental Network Data (AP-FRIEND)


AP-FRIEND, launched in 1997, is a regional component of FRIEND (Flow Regimes from International and Experimental Network Data), a global crosscutting IHP project aimed at advancing technical knowledge and research in the field of hydrology. Click here for further information!

It is coordinated by the IHP Regional Steering Committee for Southeast Asia and the Pacific, with financial support provided by UNESCO Regular Budget and by a Trust Fund to UNESCO from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japanese Government and UNESCO Jakarta.

The First Phase of APFRIEND (1997 – 2001) was carried out to improve the understanding of hydrological science and water resources management in the region through comparative studies of the similarity and variability of the regional hydrological occurrences and water resource systems. With the great efforts from nearly 200 scientists in 5 working groups, significant achievements have been obtained for the phase I of the Asian Pacific FRIEND during the past several years and summarized in the Asian Pacific FRIEND Report for Phase 1 (1997-2001), published in 2002 (IHP V – Technical document in Hydrology No. 9, Regional Steering Committee for Southeast Asia and the Pacific, UNESCO Jakarta Office 2002).

In the initial stage of AP-FRIEND Phase 2, two surveys were carried out by IHP National Committees in 2002 and 2003 to investigate the critical issues of IHP VI for AP-FRIEND to focus on. It was found that issues involving extreme rainfall events and the resulting flooding in both rural and urban areas were the primary concern of most countries. The next concern was the investigations of low flows (including droughts). In particular, as rainfall is an essential input to high flow, low flow and drought analysis and a priority in many countries, it was proposed that activities within these themes initially be focused on rainfall, specifically in terms of a) what data are available in countries, b) how accessible is the data for research within each country, c) how accessible is the data for research outside the country, d) availability and origin of design rainfall guidelines/standards in countries and e) investigate development of regionally consistent rainfall design techniques and guidelines.

In order to progress with the phase 2 plan, each country provided input on availability of data both within and between the countries, the source organizations and finally the design guidelines/standards and analysis techniques used by the same countries.

The activities carried out and results obtained in the initial stage of the Asia Pacific FRIEND phase 2, were presented at the “Intensity Frequency Duration and Flood Frequencies Determination Meeting” held in the Regional Humid Tropic Hydrology and Water Resources Centre for Southeast Asia and the Pacific (HTC) in Kuala Lumpur, 6 and 7 June 2005.

Click here to download AP-FRIEND Kuala Lumpur report!

During the AP FRIEND Meeting in Kuala Lumpur in June 2005, attended by country representatives from Australia, China, Indonesia, Japan, Korea, Malaysia, New Zealand, Philippines and Vietnam, it was discussed that the different participating countries employed different methods of analysis their Rainfall Intensity-Duration-Frequency (RIDF) curves. Thus, during this workshop, it was decided that a worthwhile undertaking the group would be to learn from the various participating countries how they RIDF are conducted. At the end of the workshop, the different country representatives were asked to supply extreme rainfall data from their own countries to be sent to everyone so that a comparison of the various methods used in RIDF analysis and subsequently estimating design rainfalls could be made by individuals from participating countries. As results, report on “Rainfall Intensity Duration Frequency (IDF) Analysis for the Asia Pacific Region” was published in November 2008. This report was presented in AP FRIEND Workshop in Ho Chi Minh City, Vietnam in March 2009. Please click here to download this report.

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