Hyderabad man builds over 600 rainwater pits after learning the skill himself

Rainwater-harvesting systems collect rain that falls on rooftops or other surfaces. Groundwater-recharge systems direct that water into the soil so underground water reserves can recover. Together, they reduce wasted runoff and support water availability after the monsoon.

A recharge pit is a below-ground structure connected to rainwater channels. Water enters the pit, while filters or silt traps help remove soil and debris. The water then gradually moves through soil and rock into underground water-bearing layers. Correct connections are essential because disconnected channels can send water into drains instead.

The article highlights why design matters. Pits that are too small, blocked by silt or poorly connected may not recharge groundwater effectively. Prasad says systems should remain functional for 20 to 25 years when they receive proper maintenance, including cleaning and regular checks before the rains.

Ranga Prasad began with a local problem, not a large campaign. During Hyderabad’s 2015 water shortage, he wanted a recharge pit at the premises he leased in Gachibowli. When he could not find anyone to build it, he decided to learn the work himself. That decision became a practical environmental mission.

He attended training programmes and workshops across India. He also renovated old recharge pits that had stopped working. These experiences showed him that systems need correct sizing, proper connections and regular cleaning. In November 2016, he started a rainwater-harvesting business that later operated as HydRainHarvest.

His work expanded from one property to homes, buildings and large communities. He focused on both new installations and repairs. Nearly a decade later, he says HydRainHarvest has helped install more than 600 rainwater-harvesting and groundwater-recharge systems across Hyderabad.

Hyderabad receives substantial rainfall despite its water concerns. Ranga Prasad cites an average annual figure of around 810 mm. The challenge is not simply how much rain falls, but how much reaches the ground instead of flowing away through drainage lines.

Prasad estimates that about 350 out of every 1,000 houses have rainwater-harvesting pits. He also says most are not regularly maintained. This is his estimate, not the result of a citywide official survey, so it should be understood as an indication rather than a precise count.

The figures show a gap between rainfall and practical capture. Homes may receive enough rain to support recharge, but poorly sized, blocked or badly connected systems reduce the benefit. Regular cleaning and preparation before the monsoon are therefore important for turning rainfall into stored groundwater.

Rainwater often fails to replenish groundwater because collection systems do not guide enough water into the ground. Hyderabad receives around 810 mm of rain annually, but runoff from rooftops and open spaces commonly flows into drains instead. This reduces the amount available for groundwater recharge.

Prasad identifies three common problems. Some recharge pits are too small for the water they receive. Others are blocked by accumulated silt and debris. Poor connections between rooftops, channels and pits can also interrupt the flow. In some buildings, only a portion of rooftop rainwater is sent towards the pit.

Maintenance makes the problem worse. Many pits are not cleaned or checked regularly, and residents may wait until the monsoon or a water shortage before acting. Government guidance stresses cleaning, removing accumulated material and checking filters and channels before the rains begin.

When recharge systems capture more rain, more water is directed into the ground instead of being lost through drains. This can improve groundwater availability and may reduce the need for tanker deliveries during shortages. The benefit depends on effective design, correct connections and continued maintenance.

One large project in Kokapet covered more than 40 acres. It included four large recharge structures with silt traps and 40 individual recharge systems. Some clients reported that their monthly tanker requirement fell from around 100 tankers to 25 or 30 after installation.

These results are individual client reports, not a consolidated assessment of all HydRainHarvest projects. Still, they show why households and communities are interested in recharge. Prasad’s planned one-square-kilometre demonstration would capture water from rooftops, roads, parks and other shared spaces, potentially extending the approach beyond individual buildings.

A recharge pit works only when it can receive and pass on enough clean rainwater. Correct sizing ensures the structure can handle the runoff from its connected roof or surface. Correct channels and connections ensure water actually reaches the pit instead of flowing into drains.

The article describes several failure points. Silt and debris can accumulate and block water flow. Incorrect sizing can limit the amount captured. Poor connections can prevent rainwater from entering the ground effectively. Filters, channels and silt traps therefore need inspection and cleaning, especially before the monsoon.

Prasad says recharge systems should be designed to remain functional for 20 to 25 years, provided they receive proper maintenance. Telangana government guidance similarly recommends regular cleaning and removal of accumulated material. Maintenance turns a one-time construction project into a lasting water-conservation system.

Groundwater is water held below the ground in spaces within soil, sand, gravel and rock. Larger underground layers that store and transmit this water are called aquifers. The article focuses on recharging these underground reserves, although it does not provide a detailed scientific definition of groundwater or aquifers.

After rain falls, some water can soak into the ground. It moves downward through pores, cracks and connected spaces in soil and rock. A recharge pit helps by concentrating collected runoff and directing it below the surface. Silt traps and filters can help keep the flow open.

Replenishment depends on conditions underground and on a functioning system. Water cannot recharge effectively if pits are too small, blocked or poorly connected. In Hyderabad, sending more rooftop and open-space runoff into recharge structures could help reduce the amount lost to drains and support groundwater availability.