Rain-water harvesting session-2 in Telugu Govt School

It started off with revising on the Session 1. 

'Do you remember what happened last class?'

Children replied, 'water cycle', 'water demand' 

'What was the demand?'

'It was 3 lack liter demand for the year', they replied

'Now let's see how much of rain water is harvested.' 

Rainwater harvesting process-

The diagram on the board was explained to them- The rain water from the cloud that is fallen in the roof is collected through a pipe, then a valve which flushes the first flow which is filled with dirt, then the rest(clean water) is sent to filter, following to the sump. From there it is collected for different purposes. In your case, it is for washing and toilet purposes. 

Calculation-
The water obtained from rainwater harvesting was calculated. Calculations were involved by the students.

Roof area- 115sqm x 900mm of water considering Bangalore annual rain fall without run off. Considering 0.9 of the acquired water there is nearly 1 lack liter of water in roof top of the school.

With the rain water collected water, we can reduce our demand to 2 lack liter that is,

3,00,000 liter(demand) - 1,00,000 liter = 2,00,000

Children were then asked, 
'how the water in rainwater could be utilized?

In reference to the question the movie of importance of rain water was shown. The context of the movie was relatable to students. They thoroughly enjoyed and learnt about rainwater harvesting. 

On site RWH-

Later students were taken to the place to help them understand the existing infrastructure of rainwater harvesting in their school. We showed and explained about the first flush, filter and tank. The procedure of the water reaches the tank and utilization for washing and in bathroom was explained.

Finally, it was handed over to school to take care of this infrastructure.

Students were left with the question, 'How do you know the water is clean?'