Dam Reservoir vs. Diverted Reservoir

Attribute	Dam Reservoir	Diverted Reservoir
Definition	A reservoir created by building a dam across a river or stream to store water	A reservoir created by diverting water from a river or stream to store water
Construction	Requires building a dam structure	Requires diverting water flow
Location	Located behind the dam structure	Located along the diverted water flow path
Water Source	Water is stored from the natural flow of the river or stream	Water is diverted from the river or stream

Introduction

Reservoirs play a crucial role in water management, providing storage for water that can be used for various purposes such as irrigation, drinking water supply, and hydropower generation. Two common types of reservoirs are dam reservoirs and diverted reservoirs. While both serve the same purpose of storing water, they have distinct attributes that set them apart. In this article, we will compare the attributes of dam reservoirs and diverted reservoirs to understand their differences and similarities.

Construction

Dam reservoirs are created by constructing a dam across a river or stream, which blocks the flow of water and creates a reservoir behind the dam. The dam is typically made of concrete, earth, or rock, and is designed to withstand the pressure of the water stored in the reservoir. In contrast, diverted reservoirs are created by diverting water from a river or stream into a storage area, such as a natural depression or an excavated basin. This method does not involve the construction of a dam, but instead relies on the natural topography of the area to contain the water.

Storage Capacity

One of the key differences between dam reservoirs and diverted reservoirs is their storage capacity. Dam reservoirs can typically store a larger volume of water compared to diverted reservoirs, as the dam creates a barrier that allows for the accumulation of water over a larger area. This makes dam reservoirs ideal for storing water for irrigation, hydropower generation, and flood control. On the other hand, diverted reservoirs have a limited storage capacity, as they rely on the natural topography of the area to contain the water. This makes them more suitable for smaller-scale water storage projects.

Environmental Impact

The construction of dam reservoirs can have a significant impact on the environment, as it involves altering the natural flow of a river or stream and disrupting the ecosystem of the area. Dams can block the migration of fish, alter water temperature and quality, and inundate habitats, leading to loss of biodiversity. In contrast, diverted reservoirs have a lower environmental impact, as they do not involve the construction of a dam and rely on natural topography to store water. However, diverted reservoirs can still have some impact on the local ecosystem, especially if they are located in sensitive habitats.

Cost

The cost of constructing and maintaining a dam reservoir is typically higher than that of a diverted reservoir. Building a dam requires significant engineering expertise and materials, as well as ongoing maintenance to ensure the structural integrity of the dam. In addition, dam reservoirs may require additional infrastructure such as spillways, gates, and turbines for hydropower generation. On the other hand, diverted reservoirs are generally less expensive to construct and maintain, as they do not require the same level of engineering and materials as dam reservoirs. However, diverted reservoirs may still require some infrastructure such as pipelines or canals to divert water to the storage area.

Water Quality

The water quality in dam reservoirs and diverted reservoirs can vary depending on various factors such as the source of the water, the surrounding land use, and the presence of pollutants. Dam reservoirs may have better water quality compared to diverted reservoirs, as the dam can help regulate the flow of water and sediment, reducing turbidity and sedimentation. In addition, dam reservoirs may have better control over water temperature and dissolved oxygen levels, which can benefit aquatic life. On the other hand, diverted reservoirs may be more susceptible to contamination from runoff, agricultural chemicals, and other pollutants, as they are often located in areas with intensive land use.

Conclusion

In conclusion, dam reservoirs and diverted reservoirs have distinct attributes that make them suitable for different water storage projects. Dam reservoirs offer larger storage capacity, better water quality, and greater control over water flow, but come with a higher environmental impact and cost. Diverted reservoirs, on the other hand, have a smaller storage capacity, lower environmental impact, and lower cost, but may have poorer water quality and limited control over water flow. Ultimately, the choice between dam reservoirs and diverted reservoirs depends on the specific needs and constraints of a water management project.