Define drainage basin and drainage pattern; give examples.

Define drainage basin and drainage pattern; give examples.

• A. Basin is the land area contributing to a lake; patterns include circular.
• B. Basin is the groundwater aquifer; patterns include layered.
• C. Basin is the land area contributing to a river; patterns include circular and grid.
• D. Basin is the land area contributing to a river; drainage patterns include dendritic, trellis, radial, rectangular.

Answer: (D)

A drainage basin is the land area from which water drains toward a particular river and its tributaries, bounded by high ground that directs flow toward the outlet. Drainage patterns describe how the streams organize themselves across the landscape, reflecting the underlying geology, structure, and slope. The set of patterns you’d expect to see includes dendritic, trellis, radial, and rectangular. Dendritic patterns look like a tree and form on relatively uniform rock. Trellis patterns feature main streams running in parallel valleys with tributaries joining at steep angles, typical in folded or layered terrains. Radial patterns radiate outward from a central high point such as a hill or volcano. Rectangular patterns develop along a network of faults or joints, producing right-angle bends and a grid-like appearance. This combination correctly defines the basin and the common drainage patterns you’d observe. Defining the basin as a groundwater aquifer or listing patterns like circular or purely grid-like alone does not align with the standard concepts of drainage systems.

A drainage basin is the land area from which water drains toward a particular river and its tributaries, bounded by high ground that directs flow toward the outlet. Drainage patterns describe how the streams organize themselves across the landscape, reflecting the underlying geology, structure, and slope.

The set of patterns you’d expect to see includes dendritic, trellis, radial, and rectangular. Dendritic patterns look like a tree and form on relatively uniform rock. Trellis patterns feature main streams running in parallel valleys with tributaries joining at steep angles, typical in folded or layered terrains. Radial patterns radiate outward from a central high point such as a hill or volcano. Rectangular patterns develop along a network of faults or joints, producing right-angle bends and a grid-like appearance.

This combination correctly defines the basin and the common drainage patterns you’d observe. Defining the basin as a groundwater aquifer or listing patterns like circular or purely grid-like alone does not align with the standard concepts of drainage systems.