Rainwater Harvesting System Components
Rainwater harvesting systems mainly constitutes of following components:
...Surface Runoff
Runoff is water running off the surface. When there is rainfall, a portion of it seeps into the ground and replenishes groundwater. However, most of it flows out or runs off. Surface runoff may also be due to the water from snowmelt, stormwater, snowfall etc. In runoff, soil is saturated by water and cannot absorb the water anymore.
...Per-Litre Water Price Calculation
After installing individual meters, the next step that most communities want to take is to set a price per unit for the water being supplied. This article gives you some guidelines around how to calculate the price for water that community members are consuming.
...Rainwater Harvesting Regulations in Bangalore
It is compulsory to have a rainwater harvesting system for all buildings measuring 1200 square feet and above. For earlier building built before 2009, it is compulsory if the area is above 2400 sq. feet. It could be either a storage system for re-use or used for groundwater recharge.
...Water Table
Water table is the boundary below which the soil is saturated with water. Above the water table is the unsaturated zone, which has water and oxygen, whereas below water table, groundwater fills any space between soil and rocks.
...Aquifers
Most groundwater, including a significant amount of our drinking water, comes from aquifers. Aquifers are a layer of rock or soil that can hold water. This is the precipitation that has seeped through the soil. In order to access this water, a well must be created by drilling a hole that reaches the aquifer. While wells are manmade points of discharge for aquifers, they also discharge naturally at springs and in wetlands. Aquifers are not underground rivers, but water contained in porous rock, soil or gravel.
...Reimagine. Recreate. Restore.
This Environment day, UN Decade of Ecosystem Restoration will be launched. Human activities has adversely affected and destroyed a major part of Earth’s ecosystem. The rainforests are making way for agriculture every second and we have already destroyed 50% of the sensitive ecosystems of wetlands and coral reefs in the world.
...Rivers of India - A Tribute
A tribute to rivers of India. Produced by ICCW, IIT Madras.
Water Distribution on Earth
It is estimated that the Earth has a total volume of 1.386 billion km³ (333 million cubic miles) of water. However, over 97% of the water on earth is saline or seawater, with an average salinity of 35‰ (or 4.5%, roughly equivalent to 34gm of salts in 1kg of seawater). Typically, fresh water is defined as water with a salinity of less than 1 percent that of the oceans – i.e. below around 0.35‰.
...How much is water worth?
How do we determine the value of water? Water made the Earth unique in the known universe. Life started in it, and it sustains life. In that sense, water is priceless. But we do need to answer the question “how valuable is water”, for sustainable development.
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