Question

what is water harvesting? how can this tecgnique help in the conservation of water.

Answer 1

Water Harvesting is the collective of run off water for different purposes, instead of runoff leading to erosion, it can be saved and utilised. It is practised in the semi-arid regions and draught prone refions. It is an economic way of saving water.
 
                                           Not only does this recharging arrest groundwater depletion, it also raises the declining water table and can help augment water supply.

Rainwater harvesting and artificial recharging are becoming very important issues. It is essential to stop the decline in groundwater levels, arrest sea-water ingress, it prevent sea-water from moving landward, and conserve surface water run-off during the rainy season. 
Some of the benefits of rainwater harvesting are as follows

 Increases water availability 
Checks the declining water table
Is environmentally friendly.
Improves the quality of groundwater through the dilution   of fluoride, nitrate, and salinity. 
Prevents soil erosion and flooding especially in urban areas.
                            
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Answer 2

Rainwater harvesting essentially means collecting rainwater on the roofs of building and storing it underground for later use.
Not only does this recharging arrest groundwater depletion, it also raises the declining water table and can help augment water supply.
Rainwater harvesting and artificial recharging are becoming very important issues. It is essential to stop the decline in groundwater levels, arrest sea-water ingress, it prevent sea-water from moving landward, and conserve surface water run-off during the rainy season. 
Some of the benefits of rainwater harvesting are as follows

 Increases water availability 
Checks the declining water table
Is environmentally friendly.
Improves the quality of groundwater through the dilution   of fluoride, nitrate, and salinity. 
Prevents soil erosion and flooding especially in urban areas.