Question Detail
Which of the following is not a requirement for site selection of hydroelectric power plant?
Options
- Option A: Availability of water
- Option B: Large catchment area
- Option C: Rocky land
- Option D: Sedimentation
Correct Answer
Sedimentation
Solution & Explanation
{"type":"technical","methodBadge":"Concept & Principle","explanation":"Sedimentation is not a requirement; rather, it is a detrimental process that reduces the effective storage capacity of a reservoir and can damage turbine blades. Site selection for a hydroelectric plant focuses on maximizing water availability, head, and structural stability of the terrain.","workingPrinciple":"Hydroelectric power stations convert the potential energy of stored water ($PE = mgh$) into kinetic energy through penstocks, which then rotates a turbine to drive a generator. Excessive sedimentation leads to reservoir siltation, which decreases the lifespan of the dam and increases maintenance costs, making it a design challenge to be mitigated rather than a site selection requirement.","diagramSvg":"ReservoirDam WallPenstockTurbineHydroelectric Site Components","keyFormulas":["$P = \\eta \\rho g Q H$ тАФ Power output where $\\eta$ is efficiency, $\\rho$ is density, $g$ is gravity, $Q$ is discharge, and $H$ is head.","$E_p = mgh$ тАФ Potential energy stored in the reservoir."],"keyPoints":["High head availability (H) is essential for efficient power generation.","Rocky land is preferred to ensure a stable foundation for the massive concrete structure of the dam.","A large catchment area ensures reliable water supply throughout the year.","Sedimentation is considered a negative factor that necessitates desilting chambers."],"advantages":["High operational efficiency","Long lifespan of infrastructure","Clean and renewable energy source"],"disadvantages":["High initial capital investment","Risk of siltation and sedimentation","Ecological impact on local habitats"],"applications":["Base load power plants","Peak load management","Grid frequency regulation"],"comparisonTable":[],"additionalInfo":["Sedimentation occurs when rivers carry suspended solids that settle in the low-velocity reservoir area.","Effective site selection aims to minimize silt entry through proper dam wall location and spillway design."],"answer":"D is correct тАФ Sedimentation is an undesirable geological phenomenon that reduces dam capacity, whereas the other options are essential prerequisites for a viable hydroelectric site.","correctedOptions":["Availability of water","Large catchment area","Rocky land","Sedimentation"],"coreConcepts":["Reservoir dynamics","Hydraulic head","Sediment transport","Dam structural stability"],"crossTopicTip":"Always distinguish between 'site requirements' (beneficial conditions) and 'engineering challenges' (conditions that need mitigation). Sedimentation, evaporation, and seismic activity are typically engineering challenges."}