During peak river stages, water outflows from the river into the groundwater aquifer; under such conditions, the river is designated as _________________?
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Answer: B. Effluent stream
Explanation
An effluent stream receives water from the surrounding groundwater table during high stages. This happens because the local water table elevation sits higher than the river water level. Consequently, subsurface water continually discharges into the river channel to sustain baseflow. Groundwater and surface water bodies are dynamically interconnected within any given drainage basin. Baseflow maintenance during dry periods is primarily sustained by effluent stream interactions with aquifers. Hydrogeologists monitor river stage and groundwater well levels to determine these directional seepage flows.
Knowing whether a stream is effluent or influent helps manage regional water resource allocation. Pollution in rivers can affect nearby groundwater aquifers if local hydraulic gradients reverse direction. Agricultural pumping near rivers can sometimes convert effluent streams into water-losing influent streams. An influent stream loses water to the underlying groundwater aquifer because the river level is higher. Storm water stream is a descriptive term for surface runoff channels rather than a groundwater classification. Seepage stream is not a standard hydrogeological term used to describe groundwater and river interactions.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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