Applications of gis for a drought study

摘要

Water allocation for the management of droughts is involved with many undcertain factors. One of the most uncertain elements is the amount of evaporation during time periods of drought for a large basin where there is still no reliable estimation. By applying the geogrpahic information system, this study developed the procedure to form the image to express the unavailability of water during periods of drought for a selected drainage basin. Gaging stations of precipitation and streamflow in the studied basin were selected to sapatially represent the area. Based on the method of truncation level. 70,80,90, and 95