 Peak flows follow the rainy season of June to August, with tailing rains until February; lowest flows are in the dry season from March to May.For the lower Macal River catchment (or Mountain Pine Ridge area), tributary streams are arranged radially to feed the mainstem; principal lower basin rivers are the Privassion, Rio On, Rio Frio, Mollejon, Chaa Creek and Cacao Camp.In the lower catchment basin, there is considerable overland friction to surface runoff due to the dense terrestrial detrititus and understory on the forest floor, even though the forest canopy itself is sometimes sparse.