A clear distinction was found between areas with good drainage (i.e., areas with a marked difference between wet and dry seasons) and those areas with poor drainage (i.e., perennially swampy areas).
Encontraron unha clara distinción entre as áreas con boa drenaxe (é dicir, áreas cunha marcada diferenza entre as estacións húmida e seca) e as áreas con mala drenaxe (é dicir, que eran sempre pantanosas).