Geography is not ideal.So the area does not have a large natural water sources and permanent. Or close to the ground and sloping terrain does not soak up water and thus make the catchment are difficult to do. Like in the northeast of the country, Thai
Unfavorable terrain , making the area is not large and permanent bodies of water or nearby terrain slope and soil does not absorb water. Thus making it difficult to retain water as well. In the northeast of Thailand.
Topography unfavorable so that area has no natural resources, large and permanent. or near ground terrain slope and WHC. The reservoir's water for use, it is difficult to .Such as, in the northeastern part of .