Q.Explain with examples the layout design of the Great Bath on the Citadel in Mohenjodaro.
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Start your 14-day free trial to unlock the full solution →The Great Bath at Mohenjodaro is a masterpiece of Harappan hydraulic engineering, featuring a watertight rectangular tank with sophisticated drainage, ritual access stairs, and surrounding galleries — demonstrating advanced urban planning for what was likely a ceremonial bathing complex around 2500 BCE.
The Great Bath stands as one of the most iconic structures of the Indus Valley Civilization, revealing not just architectural skill but a deep understanding of water management, public hygiene, and possibly ritual practice. Its layout shows deliberate planning for both functionality and durability, with every element serving a clear purpose in maintaining a large public water facility.
Core Design Elements
The structure sits on the elevated Citadel mound of Mohenjodaro, signaling its importance in the urban hierarchy. The layout integrates several sophisticated features:
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The central tank dimensions and construction
The bath itself measures approximately in plan and deep. The floor and walls were built with finely fitted bricks, then made watertight using a layer of bitumen (natural tar) sandwiched between two courses of baked brick. This waterproofing technique — bitumen as sealant — shows remarkable material knowledge for preventing seepage in a structure meant to hold large volumes of water.
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Access via opposing staircases
Two broad staircases descend into the tank from the north and south ends. Each staircase has timber treads set into the brick, providing grip and comfort. The symmetrical placement suggests controlled, possibly ceremonial, entry and exit — one could descend from the north, bathe, and ascend via the south, maintaining a directional flow of movement.
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The surrounding corridor and rooms
A thick brick corridor runs around the tank on all four sides, with a series of small rooms opening onto it, particularly on the east and west. These rooms likely served as changing areas or spaces for ritual preparation. The corridor itself may have been covered, offering shade and privacy to bathers. The eastern side has a larger hall, possibly for gatherings or supervision.
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Advanced drainage system
At the southwestern corner of the tank, an outlet channel with a corbelled arch drain carries away used water. This drain connects to a larger municipal drainage network, preventing stagnation and allowing the bath to be emptied and refilled. The Harappans understood that standing water breeds disease — the drainage is not an afterthought but integral to the design.
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Water supply mechanism
Though no direct well is found inside the bath structure, a large well in an adjacent room to the north likely supplied fresh water. The proximity suggests a deliberate arrangement: draw water from the well, carry it a short distance, and fill the tank, keeping the source separate from the bathing area to maintain purity.
The use of bitumen as waterproofing is a hallmark of Harappan engineering — the same technique appears in dockyard structures at Lothal, showing standardized knowledge across the civilization.
Functional Interpretation
The Great Bath's layout strongly suggests a public or ritual bathing function rather than a private facility. The scale, central location on the Citadel, and the care in construction all point to communal use, possibly for purification rites. The surrounding rooms and controlled access imply that bathing here was a structured activity, perhaps overseen by priests or civic authorities.
Comparisons with later South Asian traditions — where ritual bathing in tanks (kunds) remains central to religious practice — suggest continuity of cultural ideas. The Great Bath may be an early prototype of the temple tanks seen in later Hindu and Buddhist architecture. …
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