World Water and Climate Atlas

Project Description
The World Water and Climate Atlas (WWCA)was developed jointly by
the International Irrigation Management Institute (IIMI) and the
Utah Climate Center at Utah State University. It aims at
providing easily accessible climatic information necessary for
the planning, design, operation, and management of water
resources and irrigated agricultural systems.

The atlas uses climatic data from over 56,000 stations
world-wide with coverage from 1961 through 1990 and includes
monthly and/or annual averages for evapo-transpiration, daily
temperatures, precipitation, and the probability distributions
of rainfall frequency and amount. The climatic factors are
mapped at a 2.5 km resolution using state-of-the-art spatial
interpolation techniques incorporating elevation modelling. The
data sets contain best available data from international and
local sources. The quality of the data varies, and has been
partly improved by removing stations responsible for outlying
values not explained by known effects. (Since there are many
locations with sparse data, short periods of record, and
spatially highly variable climate, it is still strongly
recommended that the atlas be used together with local
information.) Additional parameters included in the atlas are
the moisture availability index that can be used to identify
areas of rain-fed agricultura! l potential and to evaluate
needs for irrigation and drainage, and the net
evapo-transpiration which is an indication of the required
depth of irrigation.


Use of the atlas:

1. estimation of synthetic virgin stream-flow;
2. evaluation of flow development potential;
3. exploration of the impact of climate change on irrigated areas;
4. salinisation studies.

For more information, link to
http://www.grida.no/cgiar/awpack/atlas.htm Access and download
the atlas software at
http://www.cgiar.org/iwmi/WAtlas/atlas.htm

[Summary provided by GRID]