Q - 1 What are the advantages and disadvantages of rain water harvesting?
Q - 2 What are the advantages and disadvantages of dams?
Q - 3 What are the causes of the water scarcity?
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16
Ans -1
☆ Advantages
1. Low-cost Maintenance
Once the system is all up and running, you really don’t need to invest much money in keeping it running. If you intend only to use the collected water for non-drinking purposes, you don’t even need to purify the water.
2. Lower Water Bills
Collecting your own water means spending less on the water companies’ water. Water can be used to flush toilets, wash clothes and dishes, and to water gardens. On a bigger scale, rainwater harvesting can lead to major savings for households or small businesses.
3. Great for Irrigation
Rainwater is not subjected to any chemicals found in ground water and therefore is ideal for irrigation as well as for watering plants in the garden.
4. Reduces Ground Water Demand
As our population increases, so does the demand for water. In many areas, ground water is extracted to keep up with demand and this has lead to low levels of ground water being left over.
5. Reduces Soil Erosion and Floods
By keeping rainwater from reaching the ground, it is possible to prevent flooding if carried out on a large-enough scale. Rainwater harvesting also reduces soil erosion and keeps surface water from being contaminated with pesticides and fertilizers from rainwater run-off.
6. Multi-Purpose
Rainwater can be used for all sorts of things from flushing toilets, to washing clothes, cars, and dishes, to keeping the garden freshly watered.
☆ Disadvantages
1. Unreliable rainfall
Isn’t it just always the case that right when you need something it suddenly isn’t there? Rain is no different, and it can’t be relied upon to fall exactly when it’s needed. However, here in the UK we shouldn’t worry too much. You are unlikely to spend very long periods of time without plenty of rainwater to use.
2. Starting costs
Installing a rainwater harvesting system can be costly, with systems ranging from the low hundreds to the low thousands in cost. Similarly to solar panels, costs can be recovered in 10-15 years depending upon the rainfall and the system’s sophistication.
3. High-energy Maintenance
Rainwater harvesting tanks will take a lot of looking after, and even if this doesn’t cost much in terms of money it can become a chore. Systems can be infiltrated by rodents, algae, and insects, and can become breeding grounds for all sorts of creatures if not properly maintained.
4. Chemical roof seepage
Some kinds of roof coverings will seep chemicals which will prove harmful to plant life if the water is used to sustain it.
5. Storage limits
You may find that you cannot store all of the water you would like to, and this could mean having to tailor your water usage to the capacity of the tank.
☆ Advantages
1. Low-cost Maintenance
Once the system is all up and running, you really don’t need to invest much money in keeping it running. If you intend only to use the collected water for non-drinking purposes, you don’t even need to purify the water.
2. Lower Water Bills
Collecting your own water means spending less on the water companies’ water. Water can be used to flush toilets, wash clothes and dishes, and to water gardens. On a bigger scale, rainwater harvesting can lead to major savings for households or small businesses.
3. Great for Irrigation
Rainwater is not subjected to any chemicals found in ground water and therefore is ideal for irrigation as well as for watering plants in the garden.
4. Reduces Ground Water Demand
As our population increases, so does the demand for water. In many areas, ground water is extracted to keep up with demand and this has lead to low levels of ground water being left over.
5. Reduces Soil Erosion and Floods
By keeping rainwater from reaching the ground, it is possible to prevent flooding if carried out on a large-enough scale. Rainwater harvesting also reduces soil erosion and keeps surface water from being contaminated with pesticides and fertilizers from rainwater run-off.
6. Multi-Purpose
Rainwater can be used for all sorts of things from flushing toilets, to washing clothes, cars, and dishes, to keeping the garden freshly watered.
☆ Disadvantages
1. Unreliable rainfall
Isn’t it just always the case that right when you need something it suddenly isn’t there? Rain is no different, and it can’t be relied upon to fall exactly when it’s needed. However, here in the UK we shouldn’t worry too much. You are unlikely to spend very long periods of time without plenty of rainwater to use.
2. Starting costs
Installing a rainwater harvesting system can be costly, with systems ranging from the low hundreds to the low thousands in cost. Similarly to solar panels, costs can be recovered in 10-15 years depending upon the rainfall and the system’s sophistication.
3. High-energy Maintenance
Rainwater harvesting tanks will take a lot of looking after, and even if this doesn’t cost much in terms of money it can become a chore. Systems can be infiltrated by rodents, algae, and insects, and can become breeding grounds for all sorts of creatures if not properly maintained.
4. Chemical roof seepage
Some kinds of roof coverings will seep chemicals which will prove harmful to plant life if the water is used to sustain it.
5. Storage limits
You may find that you cannot store all of the water you would like to, and this could mean having to tailor your water usage to the capacity of the tank.
Answered by
7
They are cheap ..less expensive
Dams helps in navigation ... controls flood...
Over exploitation of water is major reason for water scarecity. .
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