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RE: Basic Wind Speed in Indonesia

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There is a latitude that defines an area generally referred to as the doldrums. It is roughly within 5 to 10 degrees north and south of the equator. In the area of concern for you, the 5 degree latitude bisects the island of Papua New Guinea. Below the line you have a frequency of 3-5 typhoons per year. Above 5 degrees are the doldrums. Java and Sumatra are within the doldrums. Timor is on the line where the typhoons form. RE: The Designers Guide to Wind Loading of Building Structures, by N J Cook. The Philippines are north of the equator and are probably not relevant. The NW Cape of Australia with a wind velocity of 130 mph is relevant and the wind velocities increase dramatically to 130 mph.

In the area within the doldrums the TI 809-01 (AKA UFC 3-310-01) infers a default minimum of 80 mph (3 second gust) in the area of the doldrums.

Jon Paterka at CPP has done probabilistic studies in many areas of the world. You may want to contact him to see if he can fine tune it.

Harold Sprague

From: "Gunnar Hafsteinn Isleifsson" <ghi(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Basic Wind Speed in Indonesia
Date: Sun, 22 Aug 2004 23:54:11 +0200


Does anyone on the list know the basic wind speed in Indonesia, i.e. Borneo, Sulawesi, Maluku or Papua, preferably as UBC 3 sec. gust, Eurocode 10-min mean or UK-CP3 hourly mean.

The closest I've come are Philippine Islands (90 mph) and Caroline Islands (Koror, 95 mph) which I found in UNIFIED FACILITIES CRITERIA (UFC) 3-310-01. Extensive Internet search has been unsuccessful.

Gunnar Hafsteinn Isleifsson

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