Geography is not ideal, so there are no natural water sources area, large and. Sloping terrain near permanent or soil and water could not soak up the catchment, are difficult to use. In the northeast of the country, Thai
Unfavorable topography As a result, the area is not large bodies of water and permanently. Or nearby terrain slope and soil does not absorb water. Thus making it difficult to retain water. For example, in the Northeast of Thailand.
Topography is no problem The area has no natural resources and huge permanent or near the terrain slope, tilt and clay does not absorb water. The reservoir's water for use, it is difficult to like .In the northeast of .