Dams: A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are often used in conjunction with dams to generate electricity.

A dam can also be used to collect water or for storage of water which can be evenly distributed between locations.

Examples of Hydro Energy

The word dam can be traced back to Middle English, and before that, from Middle Dutch, as seen in the names of many old cities.

Early dam building took place in Mesopotamia and the Middle East. Dams were used to control the water level, for Mesopotamia's weather affected the Tigris and Euphrates rivers, and could be quite unpredictable.


Examples of Hydro Energy

The earliest known dam is the Jawa Dam in Jordan, 100 kilometres (62 mi) northeast of the capital Amman. This dam featured an originally 9 m (30 ft) high and 1 m (3 ft 3 in) wide stone wall, supported by a 50 m (160 ft) wide earth rampart. The structure is dated to 3000 BC.

The Romans were the first to build arch dams, where the reaction forces from the abutment stabilizes the structure from the external hydrostatic pressure, but it was only in the 19th century that the engineering skills and construction materials available were capable of building the first large scale arch dams.

Types of dams

1.By structure

                      (a) Arch dams

                      (b)Gravity dams

                       (c)Arch-gravity dams


                       (e)Embankment dams

                       (f)Rock-fill dams

                       (g)Concrete-face rock-fill dams

                       (h)Earth-fill dams

2. By size

Type of Dams

3. By use

            (a)Saddle dam


             (c)Check dam

             (d)Dry dam

             (e)Diversionary dam

             (e)Underground dam

             (f)Tailings dam

Type of dams

4. By material

                       (a)Steel dams

                       (b)Timber dams

                       (c)Other types



Examples of Hydro Energy : Water Falls

Water falls: A waterfall is a place where water flows over a vertical drop in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf.

Examples of Hydro Energy : Rivers

Rivers: A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely at the end of its course, and does not reach another body of water. Small rivers may be called by several other names, including stream, creek, brook, rivulet, and rill.

There are no official definitions for generic terms, such as river, as applied to geographic features, although in some countries or communities a stream may be defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague.

Examples of Hydro Energy : Rivers (Cont)

Rivers are part of the hydrological cycle. Water generally collects in a river from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, springs, and the release of stored water in natural ice and snowpacks (e.g. from glaciers). Potamology is the scientific study of rivers while limnology is the study of inland waters in general.

Examples of Hydro Energy

More Examples of Hydro Energy will be updated soon

Steam energy


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