Directions: Read the passage carefully and answer the questions that follow.
Long before pipes and pumps crisscrossed Indian towns, the people of Bidar carved a river beneath their feet. This underground network—known locally as a karez—was cut into the city’s rust-red laterite and guided water from the countryside to royal courts, mosques, and public fountains. Invisible for most of its length, the karez worked by understanding the plateau’s gentle slope and the meeting point of porous laterite and harder rock below. “It is engineering that listens to the earth,” says Arif Hussain, a conservation architect who has spent years walking the line of skylights that mark the route of the tunnels.
A karez begins with a mother well sunk into a reliable groundwater source. From there, a low-roofed tunnel travels toward the city with a careful fall that keeps water moving without turbulence. Along its course, workers opened a chain of vertical shafts. These served many purposes: they provided air, light, and exits for excavated soil; they offered access points for repairs; and they acted as rain inlets during heavy monsoon spells. With no pistons or turbines, gravity alone carried cool, clear water to a terminal cistern, where it rose quietly and spread into channels, tanks, and once upon a time, ornamental jets.
Local historians credit the Bahmani court with initiating Bidar’s karez during the medieval era, drawing on Iranian expertise and adapting it to Deccan geology. The builders knew that laterite absorbs and slowly releases water, particularly where it rests on less porous stone. By intercepting this seepage at the right depth and nudging it toward the city’s heart, they could supply everyday life and spectacle. Ablution tanks brimmed at mosques; palace gardens flashed with rills; roadside watering points refreshed travelers and animals in the afternoon heat. “You still see the logic if you trace the old garden walls,” notes hydrogeologist Anita Reddy. “The tunnels surface near courtyards and then vanish again, like a thread dipping through cloth.”
For a visitor, the karez reveals itself as a procession of circular shafts, each rim a collar of dressed stone. Children test their depth by dropping pebbles. Farmers remember how the shaft mouths gave them cooler air in summer, and older residents point out where the final cistern once fed public taps. In some places the tunnel ceiling has collapsed, opening trenches that briefly expose the craftsmanship within: neatly cut laterite blocks, a floor smoothed by centuries of flowing water, and occasional widening chambers where silt could settle before the clear stream moved on.
Modernity has not been kind to the system. Paved roads have sealed some shafts; rubbish has choked others; new borewells tug the water table up and down. Yet a slow restoration is underway. Volunteers and municipal teams clean shaft by shaft, cap them safely, and reconnect segments that still run. “We start with airflow,” explains Mr. Hussain. “If a candle burns steady at one shaft and flickers at the next, we know where the tunnel breathes—and where it is blocked.” Using old maps and fresh surveys, they mark how the karez once linked suburban fields to core neighborhoods, then propose setbacks and gentle recharge ponds to keep it alive.
Bidar’s subterranean work sits within a broader tapestry of Indian water wisdom. In Gujarat and Rajasthan, stepwells descend in geometric terraces to reach fluctuating groundwater; in the Deccan, tanks harnessed monsoon runoff behind earthen embankments; along ancient caravan routes, small domed kunds offered rain-fed reserves. The karez belongs to this family but chooses a different strategy: hiding from evaporation by traveling in shadow, and arriving at the surface only where people most need it.
Today, engineers study the karez not just for heritage value but for clues to climate resilience. An underground conduit preserves water quality and temperature, reduces losses to heat and wind, and invites maintenance through its own series of skylights. More importantly, it reminds cities to match ambition to terrain. The builders of Bidar read their plateau as carefully as a chartered surveyor, aligning stone and slope so that a quiet trickle could become a public promise.