RAIN WATER HARVESTING:
It means capturing rain where it falls or capturing the run off in your own village or town,
and taking measures to keep that water clean by not allowing polluting activities to take place in the catchment.
Therefore, water harvesting can be undertaken through a variety of ways
Capturing runoff from rooftops
Capturing runoff from local catchments
Capturing seasonal floodwaters from local streams
Conserving water through watershed management
   
These techniques can serve the following purposes:
Provide drinking water
Provide irrigation water
Increase groundwater recharge
Reduce stormwater discharges, urban floods and overloading
  of sewage treatment plants
Reduce seawater ingress in coastal areas.
 
In general, water harvesting is the activity of direct collection of rainwater.
The rainwater collected can be stored for direct use or can be recharged into the groundwater.
Rain is the first form of water that we know in the hydrological cycle,
hence is a primary source of water for us.

Water harvesting means to understand the value of rain,
and to make optimum use of the rainwater at the place where it falls.
Hence,Human Welfare Trust, which is a public interest organisation which promotes environmentally sound
equitable development strategies in villages and towns.
Tree Planting and Care is a holy act. One tree is equated to 10 children in Indian scriptures.
Trees in India known for their grandeur and majesty are like the green pearl in the Indian crown.
Planting trees is an easy and effective way to beautify your property,
provide shade in summer and wind protection in winter and enhance privacy all while
increasing real estate values at the same time.
 
Environmental Benefits Of Planting Trees
 
Trees serve as a natural habitat, which provides support to a
  wide variety of flora and fauna. They provide a sense of privacy and security to the wildlife, seeking shelter in the woods, apart from providing them with food and nutrients.
   
Trees remove excess amount of carbon dioxide and air
  pollutants present in the atmosphere, including sulfur dioxide, ozone and nitrogen oxide. In return, they give us oxygen required for living life.
   
Planting trees is very important to improve the quality of air and    
  reduce its pollution.
   
The visual quality of a landscape is improved by planting trees,
  which, in turn, improves the quality of life.
   
Planting trees help reduce ozone levels in urban cities. Even the
  biodiversity gets enriched in turn.
   
Trees control the climate by moderating the effects of sun, wind,
  and rain. While they moderate summer temperature by providing shade, in winters, they act as windbreaks for your home, thereby helping you save on heating cost.
   
Trees reduce soil erosion, because they bind the soil through
  their roots, which would otherwise have been washed away in rainstorms and flood. Trees also help improve the fertility of soil. Rich soil transfers nutrients to food, which contributes to human health.
   
The greenery of trees adds color to the landscape and
  enhances the picturesque beauty of the environment.
   
According to a recent study, houses and properties on tree-lined
  streets are found to be attractive places to live in. Apart from this, trees and shrubs planted around homes also provide evaporative cooling benefits.
   
Trees are great absorbers of noise. Noise pollution can be
  reduced, to a great extent, by planting more and more trees.
   
Planting of trees facilitates better management of flood water.
 
Trees also moderate flood hazards, by allowing the rainwater to percolate into the soil, instead of running over it.
   
The demand for clean drinking water can be met by planting new
 
trees. Forests and plant cover naturally slows the runoff of rainwater, thereby filtering it. Once slowed, rainwater seeps down to refill underground storage tanks or aquifers. Also, they prevent water from mixing with the salt water of oceans. This is of immense help, as salty water takes much longer to re-enter the fresh water portion of the hydrological cycle. 
   
Hence HWT create awareness amidst people in village, towns and cities on planting trees & benefits of the same