Impact of dams

Ancient dams[ edit ] Early dam building took place in Mesopotamia and the Middle East. The structure is dated to BC. The structure was built around [5] or BC [6] as a diversion dam for flood control, but was destroyed by heavy rain during construction or shortly afterwards.

Impact of dams

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The Aquair UW Sybmersible Generator is a special low-speed, high-output alternator which has been mounted in an oil-filled heavy-duty cast aluminum housing with triple seals. Originally designed and used aboard seismic sleds towed behind oil exploration vessels.

If your home is on the sea or near a tideway, the Aquair UW is ideal for you. Its alternator produces electricity no matter which way the tide is flowing, and the unit is impervious to saltwater.

It is designed to produce DC power at moderate propeller speeds; this is ideal for home power generation when the house is located near a reasonable fast-running stream. When mounted in a stream that flows at 9 mph slow jogthe Aquair produces 8 amps watt-hours per hour continuously, 2.

With energy conservation measures, this is enough to provide a good level of comfort in a remote home away from utility power. At a stream speed of 6 mph brisk walk it still produces 1.

And you can construct a timber or rock venturi that increases water speed and output considerably. The Aquair is often mounted above a narrow stream on bridging logs, with a simple verticle leg that can be adjusted for varying water levels.

On wider streams, use the ancient "well-sweep" counter-weighted cantilever system to raise and lower the unit into the flow. Other mounting options are to secure the unit inside a venturi pipe or under floating pontoons. The Aquair Submersible Generator should be mounted with the propeller facing the stream flow.

It should be strongly secured to a timber or aluminum supporting structure to withstand strong downstream forces. The method of supporting it and providing vertical adjustment depends entirely on the character of the stream or river you're using.

The propeller is Small stuff can't hurt it so you don't need a screen. If your stream is subject to sudden spates due to thunderstorms or flood control dams upstream and the flow is violent enough to dislodge boulders or logs, you should have a method of raising the generator out of the way.

Impact of dams

A 3" diameter vertical leg can be purchased see picture below that you can adapt to your installation. The Aquair UW is a very rugged machine and requires no maintenance once it has been mounted. The prop is made of top-grade ductile aluminum and can be hammered back into shape in case it really gets walloped.

To be on the safe side, it can't hurt to get a spare prop. It really doesn't have enough output to impact the average American home, unless you are extremely frugal in your power requirements.

This is no longer a stock item, must contact the manufacturer directly at: The Aquair UW is Propeller diameter is It is self-current limiting and can't overspeed or burn out the windings.

The energy it produces must be stored in deep cycle batteries. The Aquair should be carefully regulated to get the best out of your system and to avoid damaging the battery bank. If your home is on the banks of a stream up to feet awayyou can transmit the Aquair's power directly to the battery bank in the house.This page describes various important roles that dams play in the United States.

It is geared toward general audiences that wish to learn more about the purpose of dams and what impact they have in their lives and communities.

The United States Army Corps of Engineers built numerous dams along the Columbia River and its tributaries, destroying entire Native villages and treaty-guaranteed fishing sites, and with them the economic, cultural, and spiritual livelihood of thousands of Indian people.

HISTORY OF LYNCHBURG, VIRGINIA The History of Lynchburg, Virginia An Overview In the mid's, the colonial village of New London in central Virginia was an important trading center, however, it was difficult to reach from northern towns (such as Charlottesville) due to the necessity of fording the Fluvanna (now James) River, which .

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AQUAIR UW Submersible Hydro Generator - no turbines, no dams, no pipes up to kilowatt-hours per day from any fast-running stream with only 13" of clear water!

The Aquair UW Sybmersible Generator is a special low-speed, high-output alternator which has been mounted in an oil-filled heavy-duty cast aluminum housing with triple seals. Hydroelectric power includes both massive hydroelectric dams and small run-of-the-river plants, both of which have associated environmental impacts.

The environmental impact of reservoirs comes under ever-increasing scrutiny as the global demand for water and energy increases and the number and size of reservoirs increases. Dams and reservoirs can be used to supply drinking water, generate hydroelectric power, increase the water supply for irrigation.

Environmental impact of reservoirs - Wikipedia