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Small dams

Advantages:

• requires comparatively low initial investment which is more suitable to Pakistan’s economy

• maintenance cost is low

• construction time is less

• very few people need to be evacuated in order to construct the small dams

• they have little impact on rivers and aquatic ecosystems and it does not harm the underwater life as much as large dams

• silting problem is easier to solve

Dis-advantages:

• irrigates local areas only

• supply little or no electricity

• less important for flood control

Large dams

Advantages:

• irrigates a vast area

• major supplies of HEP

• more important for flood control

Dis-advantages:

• silting problem is more difficult to solve than small dams

• initial investment cost is much higher

• maintenance cost is also very high

• construction time is more

• large-scale evacuation is required

• more negative impacts on rivers and aquatic ecosystems that also lead to extensive loss of underwater life

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Advantages of small dams:

Small dams store water for irrigation

Supply water for industrial and domestic uses

Silting problem is easier to solve

Low maintenance and construction costs, suitable for Pakistan's economy

Less construction time and yields quick results

Low scale evacuation required for construction of small dams.

Have little impact on aquatic ecosystems

Disadvantages of small dams:

Supply little or no electricity

Irrigate limited areas

Holds less importance in controlling floods

Advantages of large dams:

Store water for irrigation purposes

Irrigate vast areas

Supply water for domestic and industrial use

Supply huge amounts of HEP compared to small dams

Play a more important role in flood control

Disadvantages of Large dams:

Initial investment costs and maintenance costs are very high, being less suited to Pakistan's economy

Silting problem is difficult to solve

Longer construction time and does not yield quick results

Extensive impacts on rivers and ecosystems, harming them by loss of various species

Large scale evacuation is required for building large dams that may cause disputes and other issues. The Mangla project leaded to 40 000 people being evacuated for its construction

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Wishma Manzoor; Advantages and disadvantages of small and large dams 

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Wishma Manzoor; Advantages and disadvantages of small and large dams 

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Large dams have many benefits as they can store a large amount of water and they can produce hydroelectricity. But it also have many disadvantages like it requires a large area to evacuate for the construction of dam. It takes a long time for the construction of the dam. It is difficult remove silt from large dams.

Small dams requie a small time for the construction of dam and it requires a small area to evacuate. It is easy to remove silt from small dams. It also have disadvantages like it can store less water and cannot produce hydroelectricity as well .

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Advantages of small dams:

1. They can provide water supply, flood control, hydropower generation,and recreation for rural and agricultural areas.

2. They can help manage water resources by storing and regulating water flow, which can be useful during periods the area is experiencing drought.

Disadvantages of small dams:

1. They have a shorter lifecycle than larger dams.

2. They only generate a small amount of energy, which may not be enough.

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Small dams Advantages :Small dams are used to store water for irrigation purpose. These dams supply water for industrial and domestic use. In small dams silting problem is easier to solve. To build these small dams low initial investment is required, so better suited to Pakistan’s economy. Maintenance cost is low.

Small dams disadvantages: Small dams irrigate only local areas. They supply little or no electricity.

Large Dams Advantages: large dams store water for irrigation. They irrigate vast areas. Supply water for industrial and domestic use. Large Dams are major suppliers of HEP ( hydroelectricity).Large dams are more important for flood control.

Large Dams Disadvantages: Initial cos is high. Maintenance cost is very high. It takes more time to be constructed . Many people are needed to be evacuated while building a large dam. Example: 40,000 people were evacuated for the raising of Mangla Dam Project.

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LARGE DAMS ADVANTAGES:

irrigate vast area

store more water

more helpful in floods

LARGE DAMS DISADVANTAGES:

more people needed to be evacuated

more cost to built

takes more time to built

maintenance cost is high

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Advantages of Large dams:

1. Large dams are a significant source of renewable energy, providing a steady supply of energy that can help reduce reliance on fossil fuels.

2. Large dams can help manage water resources by storing and regulating water flow, which can be useful during periods of drought and for irrigation purposes.

Disadvantages of Large dams:

1. Large dams are expensive to build and take many years to construct, which can be a significant barrier to entry.

2. Large dams can alter the flow of water in a region, potentially leading to drier downstream areas or reduced water availability during periods of drought.

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Advantages and Disadvantages of Large and Small Dams:

1. Advantages of Small dams:

They store water for irrigation. Supply water for industrial and domestic use. Silting problem is easier to solve. It is more suitable for Pakistan''s economy, as it requires low initial investment compared to large dams. The cost of its maintenance is low. Construction time is less and yields quick results. Very few people have to be evacuated in order to construct the dam. They have little impact on the rivers, watersheds and aquatic ecosystems.

2. Disadvantages of Small dams:

Small dams can only irrigate local areas. They supply little to no hydroelectricity. It is less important for flood control.

3. Advantages of Large dams:

Large dams can irrigate a vast area. They are major suppliers of HEP. More important for flood control. Supply water for industrial and domestic use.

4. Disadvantages of Large dams:

Silting problem is difficult to solve. Initial investment cost is very high. Maintenance cost is high. Construction time is more and does not yield quick results. Large scale evacuation takes place in order to construct dam. Great impact on rivers, watersheds and aquatic ecosystems.

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SMALL DAMS (ADVANTAGES) :

~ Lesser resources needed

~ Construction time is smaller

~ Minimal effect on aquatic life

~ More control on erosion

~ More small dams result in many different stream flows rather than one major stream

~Lower evacuation rates

~silting is easier to fix

DISADVANTAGES :

~Not very significant in terms of controlling floods

~Only local areas can use them for irrigation and electricity

LARGE DAMS (advantages) :

~Major control in terms of flooding

~Irrigates an extensive land

~Major stream

~ provides water for industrial and domestic use

DISADVANTAGES :

~Longer building time

~Effects the environment

~ More resources required

~higher evacuation rates

~Silting is harder to deal with

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Advantages and disadvantage of large and small dams.     (Maira Waqas)

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Advantages and disadvantage of large and small dams.     (Maira Waqas)

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Large dams:

(Advantages)The large dams are very helpful for a country as they help to control flood, and flood cause a huge loss which is prevented by the large dams. The large dams produce hydro electric power that is used almost all over the secondary industry. The large dams supply water for irrigation. Irrigation is the most important sector of Pakistan. The large dams provide water for domestic uses as well.

(Disadvantages)the large dams can also cause some disadvantage like it has a high initial cost , which is the reason of less large dams. The large dams require a high maintenance cost. The large dams need the disruption of local ecosystems, it also requires the destruction of forests.

Small dams:

(Advantages)small dams have low initial cost and low maintenance cost, they store water for irrigation, they don't require destruction of forests, they don't require disruption of local ecosystems.

(Disadvantages)small dams store less water , they are not illegible to control flood . Don't produce HEP. They alter water flow.