Method of rainwater harvestings are..

Question

Examoogle · Accepted Answer

Option D: all of the above

Explanation & Concepts:
Rainwater harvesting is the process of collecting, storing, and conserving surface runoff from rooftops, lands, or open areas for future utilization. Structures like check dams and khet talavdi are fundamental engineering interventions designed to improve groundwater recharge and provide irrigation support.

Working Principle: These structures function by reducing the velocity of surface runoff, thereby increasing the infiltration time. A check dam creates a physical barrier to impede flow, while a khet talavdi (farm pond) provides a storage basin that facilitates percolation into the underlying aquifer and provides localized water security.

Key Formulas: $Q = C \cdot I \cdot A$ — where $Q$ is peak runoff rate, $C$ is runoff coefficient, $I$ is rainfall intensity, and $A$ is catchment area.; $V = A \cdot d \cdot r$ — where $V$ is volume of water harvested, $d$ is depth of rainfall, and $r$ is runoff efficiency coefficient.

Key Points: Check dams are small, low-head dams built across minor streams to store water temporarily.; Khet talavdi is an on-farm storage structure essential for rainfed agriculture in semi-arid regions.; The primary goal of these structures is to mitigate water scarcity and prevent soil erosion.

Advantages: Increases groundwater table elevation; Reduces soil erosion and sediment transport; Provides localized water source for irrigation and livestock

Disadvantages: High initial investment costs; Maintenance required for silt removal; Efficiency dependent on geological soil permeability

Applications: Agricultural irrigation; Recharging domestic borewells; Flood control in micro-watersheds

Additional Info: A 'Khet Talavdi' (Farm Pond) is particularly prevalent in the state of Gujarat, India, under various government water conservation schemes.. Check dams effectively reduce the 'time of concentration' of a watershed, allowing more water to infiltrate into the soil.

Answer: D is correct — All listed options are recognized civil engineering methods for capturing and storing rainwater to enhance water availability.

Exam Tip: In competitive exams, always check if 'All of the above' encompasses broader categories or specific subset examples; often, regional terms like 'Khet Talavdi' are included to test local knowledge of water conservation practices.

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Option A: check dam

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Option B: khet talavdi

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Option C: rain water harvesting

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