25. Depression Storage
Depression storage is the temporary retention of rainfall in surface depressions before it either evaporates, infiltrates into the soil, or becomes surface runoff. This concept is integral in hydrology as it influences infiltration rates and flood peak estimations. Various factors such as surface topography, land use, soil type, and rainfall characteristics play a role in determining depression storage, which can be quantified using empirical, experimental, and analytical methods.
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What we have learnt
- Depression storage is vital for understanding effective precipitation and initial abstraction losses.
- Factors influencing depression storage include topography, land use, soil types, and rainfall intensity.
- Quantification of depression storage impacts hydrological modeling and watershed management practices.
Key Concepts
- -- Depression Storage
- The amount of water that temporarily collects in surface depressions during rainfall before contributing to runoff.
- -- Initial Abstraction (Ia)
- The total initial losses in hydrology which include depression storage, interception, and infiltration.
- -- SCS Curve Number Method
- An indirect method that estimates the initial abstraction in hydrology, incorporating depression storage.
- -- Hydrologic Response Units (HRUs)
- Units in distributed models used to estimate depression storage based on specific land use and soil conditions.
- -- Green Infrastructure (GI)
- Design interventions in urban areas that aim to increase depression storage and reduce runoff.
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