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1.2

Minor Versionm

by Procheta Mallik

    • Exercise caution when using paper cutter

    • Be wary of sharp edges of the cut bottle

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  1. Measure and mark 1 cm from the neck of  bottle.
    • Measure and mark 1 cm from the neck of bottle.

    • Cut the top portion of plastic bottle at the point where you made the mark.

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    • Identify the thin line that runs through the bottle wall.

    • It helps as a reference line to paste the scale in a perfect orientation.

    • Leave out the tapered portion at the base of the bottle as it will mess up the accuracy.

    • Starting above the tapered portion, peel and paste the provided scale perpendicularly along the thin line.

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    • Use enough transparent tape over the scale to make it water-proof.

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    • Fill the bottle with water to the 'zero' point.

    • This helps to bring down the errors that occur due to the tapered portion of bottle.

    • Your own rain gauge is now ready.

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    • Take your rain gauge to the rooftop and place it on a flat surface

    • It is important that the rain falls unobstructed into the bottle. So, do not conduct measurement in balcony, sunshades and near parapet wall.

    • Use multiple bricks/stones around the bottle which helps to hold the bottle firmly to surface.

    • Do not stress the bottle with bricks/ supporting objects as it will result in change of volume of the bottle and it leads to incorrect readings.

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    • Before rain, set up the rain gauge as described in the above steps.

    • Once the rain has stopped, remove the rain gauge from rooftop without spilling the water.

    • The water level in the bottle tells the amount of rain received by your locality for that period of time.

    • Measure the water level by placing on a flat surface

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    • The "Scale" pasted to the bottle is not perfectly vertical.

    • Failure to calibrate the bottle to the zero mark before conducting the measurement

    • Inaccurate readings due to bottle being deformed by Bricks/ supporting objects.

    • Measurements taken on a slant surface.

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    • Make a rain guage made of larger diameter vessel. Compare the results with smaller diameter rain gauge. Are they same ?

    • Compare your results with rain data from the news and find out the accuracy of rain gauge.

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Finish Line

Attached Documents

Kailash NR

Member since: 05/02/2017

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67 Guides authored

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