The section on Groundwater in the textbook is out of the syllabus – direct, indirect drainage, acquifers (Gravel, sandstone, conglomerate), acquicludes (clay, shale, Granite), springs and artesian wells. Meteoric water (ground water) Magmatic water, Connate water (found is Sed rocks) Pg 111, 112 and 113.
Gradient more runoff and less infiltration if there is a steep slope. Less runoff therefore the drainage density will be lower. Low drainage density 1km of river flowing in 1 km sq drainage basin. Extremely high drainage density (eg. Badlands) 700 km of river flowing in 1 km sq drainage basin
Stream order helps to conceptually organize the streams in a watershed. As streams increase in order, they also increase in length, exponentially; World-wide, about 70-75% of stream miles occur as headwater (first order) streams.