Sunday, November 13, 2022

Rainwater Harvesting at Vidya Prabodhini College, Alto-Parvari-Goa

Vidya Prabodhani college is in a 3850 sqm area on laterite plateau. The building has three floors with a central quadrangle and classrooms on each floor. Next to the building is a 4000 sqm playground. The building accommodates students from class one to degree college. A few other details about the college are given below.

Location: Porvorim, Goa

Run by: Praboshan Education Society

Total occupancy: 2893 students + staff

Location of Vidya Prabodhini college

1.0 Situation before intervention

Sources of water

The main source of water is a borewell located in the playground. The college also has a municipal water supply connection.

Water storage

Water from the borewell is pumped into a 60KL sump that is located at the entrance of the playground.  Water from this sump is further pumped into two overhead tanks of 10KL capacity each. This water is then passed through Aquaguard filters for drinking purposes.

Water infrastructure at Vidya Prabodhini college

Water demand: 60 KLD

Utilities of water: Water is used for drinking, handwashing, in the toilet, washing utensils in the canteen, cleaning and to water the garden including potted plants.


Left: 3-Storey Building; Right: Borewell


Left: 10000x2 OHT; Right: 60,000L Sump


Left: Downtake pipes; Right: Canteen

Water filter

2.0 Interventions undertaken

2.1 Rainwater harvesting

Project funded by: Purvankara and Provide Housing Limited

Annual rainfall in Goa: ~3000mm

Given the high average rainfall in Goa, even a part of the roof considered for RWH is sufficient to meet their water demand during the monsoon season. Using harvested rainwater will reduce stress on the borewell as well as the municipal water.

Rooftop area considered for RWH: 1221 sqm

annual runoff from this area: 3207 KL

Satisfies the water demand for: 55 days of the year

Tasks undertaken

The following tasks were undertaken for the project.

  • Plumbing: Connecting all the downpipes and passing the rainwater through rainy filters.

  • New sump: A new sump of  3KL (dimensions: 6ftx6ftx3ft) serves as a filter and storage for small showers

  • Existing sump: The overflow from this is connected to the existing 60KL sump

  • Recharge Well: Once the 60KL sump is filled with the overflow from the 3KL sump, the water will overflow to a Recharge Well with dimension of 5ft x 24ft  (Static volume of  13KL)

Illustration of the RWH system at the college

Left: Rainy filer; Right: Recharge well

2.2 Training and awareness program

Regular Maintenance of the system

  • A training session was organized for regular  maintenance of the RWH system. 

  • In the same session, a schedule was planned for the maintenance of the system.

Training on the installed RWH system

Usage of pH meter, TDS meter and H2S vials

A training for the staff was organized to

  • check the pH, TDS and bacterial contamination in the rain water using hand held meters and H2S vials.

  • pH meter, TDS meter, Calibration solution for pH and TDS meter and H2S vials were handed over to the institution to check the quality of water on a regular basis.

Testing kits

2.3 Planned activities for the future

The following activities are planned for the project in the upcoming days


  • Awareness sessions for the students and staff.

  • Awareness sessions for the panchayat and locals around the institution.

Demand management

  • Installation of Aerators.


  • Installation of a communication board that informs about the RWH system and its objectives.

3.0 Conclusion

Given its location, Vidya Prabodhini college is in a pretty good position to harvest rainwater. This can work as a great model for rooftop rainwater harvesting and groundwater recharge using recharge wells for the panchayat and the surrounding villages and towns. Being a college, this is also a great place for the future generations to learn about water management and conservation.

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