How is rainfall calculated?

The standard instrument for the measurement of rainfall is the 203mm (8 inch) rain gauge. This is essentially a circular funnel with a diameter of 203mm which collects the rain into a graduated and calibrated cylinder. The top of the rain gauge is 0.3m above the ground.

Does rainwater have more oxygen?

Rainwater also contains more oxygen that tap water. Carbon dioxide, when it combines with other minerals in the atmosphere, imparts to rainwater an acidic pH.

How does rain water harvesting work?

How does rainwater harvesting work? Rainwater harvesting systems capture rainwater by directing it from large surfaces (e.g. roofs) to an underground or over-ground holding tank. The harvested rainwater is filtered and then pumped directly to the appliances or to a header tank.

How many Litres is 1mm of rain?

In terms of volume, with a rainfall of 10 mm, every square metre of the field receives 0.01 m, or 10 litres, of rain water. With a rainfall of 1 mm, every square metre receives 1 litre of rain water.

What is the importance of rain water harvesting?

What is the importance of rainwater harvesting? Rainwater harvesting is a sustainable process that helps in preserving water for future needs. Water scarcity is a major concern in today’s scenario. The process of rainwater harvesting is a good way to conserve water.

What are the water harvesting techniques?

A number of water harvesting techniques are based along contours including: contour ploughing; contour ridges; stone lines; grass strips and terraces. The technique used depends on the steepness of the slope, soil type, conditions, crops grown and other factors such as the availability of labour.

Is rain water salt water?

Rainwater is not salty. Clouds that bring rain are built up by vapor. The heat of the sun evaporates seawater and produces vapor. Seawater is salty.

Is rain water safe for bathing?

Most people are comfortable with washing clothes or flushing toilets using rainwater. But experts say that rainwater is completely safe for bathing and showering. Also, bathing in rainwater has some great health advantages. Rainwater is soft by nature, this means there are less minerals dissolved in it than hard water.

What are different types of rainwater harvesting?

7 Different Types Of Rainwater Harvesting Systems

• Water Butt. One of the most basic types of rainwater harvesting systems; water Butt collects rainwater in a container from natural rainfall and/or drain pipes.
• Direct-Pumped.
• Indirect Pumped.
• Indirect Gravity.
• Gravity Only.
• Retention Ponds.
• In-Ground Storage.

Why do plants grow after rain?

Rainwater also contains more oxygen that tap water. When this acidic rainwater reaches the soil, it helps to release micronutrients such as zinc, manganese, copper and iron that are essential to plant growth but are mostly locked up in our local soil, which typically registers a neutral to alkaline pH.

Do you need to treat rainwater?

Rainwater may contain pollution, animal excrement and other particles which are harmful to humans, plants and animals. Therefore collected rainwater needs to be treated before it is safe to use for business. There are two primary steps to rainwater treatment: filtration and sterilisation using chlorine or UV light.

Is rain water dirty?

Rain can wash different types of contaminants into the water you collect (for example, bird poop on your roof could end up in your water barrel or tank). Rainwater can carry bacteria, parasites, viruses, and chemicals that could make you sick, and it has been linked to disease outbreaks.

What is rainwater harvesting introduction?

ainwater harvesting is a technology used for collecting and storing rainwater from rooftops, the land surface or rock catchments using simple techniques such as jars and pots as well as more complex techniques such as underground check dams.

What are the properties of rain water?

Rainwater is slightly acidic and very low in dissolved minerals; as such, it is relatively aggressive. Rainwater can dissolve heavy metals and other impurities from materials of the catchment and storage tank.

Is rain water hard or soft?

Rainwater is naturally soft, but dissolved carbon dioxide gas from the atmosphere makes it slightly acidic. (This should not be confused with ‘acid rain’, which is much stronger and is caused by different gases). Rainwater soaks into the ground after it falls and then flows slowly through the soil and rocks beneath.

How much is heavy rain in MM?

Heavy rain: Greater than 4 mm per hour, but less than 8 mm per hour. Very heavy rain: Greater than 8 mm per hour. Slight shower: Less than 2 mm per hour. Moderate shower: Greater than 2 mm, but less than 10 mm per hour.

Can you use rainwater?

Rainwater can actually be very high-quality water for human consumption. You can make rainwater safe to drink by installing a filtration system, boiling or distilling the water. Some systems can also directly collect clean rainwater to use for drinking.

Are there nutrients in rainwater?

Rain contains nitrates—an important macro-nutrient. Rainwater contains nitrate – the most bio-available form of nitrogen. Nitrates, which are made up of nitrogen and oxygen, are formulated by nature for maximum uptake by your plants.

What is the difference between rain water and normal water?

Answer: Rainwater tends to be way more pure than tap water, city or well. Rain contains few salts, minerals, treatment chemicals or pharmaceuticals often found in municipal tap water. Though relatively pure, rainwater can contain particulates from the atmosphere, such as dust or pollen.

What is water harvesting and its techniques?

Rainwater harvesting, in its broadest sense, is a technology used for collecting and storing rainwater for human use from rooftops, land surfaces or rock catchments using simple techniques such as jars and pots as well as engineered techniques.

What is rainwater harvesting essay?

Rainwater harvesting is a technique in which we help the water seep into the groundwater table through open lands and porous soil. One of the main advantages of rainwater harvesting is that it increases the level of the water table below our ground.