engineering

Lowell Power Canal System and Pawtucket Gatehouse

Lowell Power Canal System and Pawtucket Gatehouse is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lowell Power Canal System and Pawtucket Gatehouse rather than just read about it. In short: The Lowell Power Canal System is the largest power canal system in the United States, at 5.6 miles in length. It is operating through six major canals on two levels, controlled by numerous gates.

Key takeaways

Lowell Power Canal System and Pawtucket Gatehouse belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lowell Power Canal System and Pawtucket Gatehouse to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lowell Power Canal System and Pawtucket Gatehouse from memory before moving on to harder problems.

Reference excerpt

The Lowell Power Canal System is the largest power canal system in the United States, at 5.6 miles in length. It is operating through six major canals on two levels, controlled by numerous gates. The system was begun in the 1790s, beginning its life as a transportation canal called the Pawtucket Canal, which was constructed to get logs from New Hampshire down the Merrimack River to shipbuilding centers at Newburyport, Massachusetts, bypassing the 30-plus-foot drop of the Pawtucket Falls. In the early 1820s, Associates of the recently deceased Francis Cabot Lowell bought up the old Pawtucket Canal in what was then East Chelmsford, Massachusetts. Within a few years, the new industrial center that became Lowell was using canals feeding off a widened and deepened Pawtucket Canal as a direct power source for their textile mills. The first of these canals was the Merrimack Canal, which powered the Merrimack Manufacturing Company. The repurposing of the Proprietors of Locks and Canals allowed the Associates to sell water power to other companies, starting with the Hamilton Canal, leading to the explosive growth of the town, and then shortly thereafter, city, of Lowell.

By the late 1840s, Lowell's canal system was producing as much power as possible. However, the Chief Engineer of Locks and Canals, an Englishman by the name of James B. Francis devised the Northern Canal and the Moody Street Feeder, to increase the capacity of, and availability of water to various parts of, the whole system. The Pawtucket Gatehouse was constructed to control flow from behind the Pawtucket Dam into the Northern Canal. The dam itself, which was built twenty years earlier, was lengthened at that time, diverting the entire Merrimack (during periods of lower flow) into the two canal system entrances above it. It is a stone dam topped with wooden flashboards – a system still used on this dam today. The level of the water is regulated by the flashboards and the metal pins that hold them back. When there is too much water going over the top of the dam, the pins bend backwards, releasing the boards, and the outflow of the dam is increased. The Gatehouse contains ten wooden gates that control the flow of the Merrimack into the canal. Originally, they were opened by a Francis Turbine, also an invention of James B. Francis. Today, the Gatehouse is controlled electrically and remotely by Boott Hydroelectric, who is partially a continuation of the Proprietors of Locks and Canals, and who operates a 24-megawatt hydroplant on the Northern Canal. The Canal System and the Gatehouse were designated a Historic Civil Engineering Landmark by the ASCE in 1984 and a Historic Mechanical Engineering Landmark by the ASME in 1985 and are part of Lowell National Historical Park. It was added to the National Register of Historic Places in 1976, and declared a National Historic Landmark the next year.

Timeline of canals 1796: Pawtucket Canal 1822: Merrimack Canal 1825: Hamilton Canal 1828: Lowell Canal 1831: Lawrence Canal, Western Canal 1835: Eastern Canal 1847: Northern Canal, Moody Street Feeder, and Pawtucket Gatehouse

See also List of National Historic Landmarks in Massachusetts National Register of Historic Places listings in Lowell, Massachusetts

References

External links Historic American Engineering Record documentation, filed under Lowell, Middlesex County, MA: HAER No. MA-1, "Lowell Canal System" HAER No. MA-1-A, "Lowell Canal System, Pawtucket Dam" HAER No. MA-4, "Hamilton Canal", 4 photos, 1 data page, 1 photo caption page HAER No. MA-4-A, "Hamilton Canal, Guard Gates", 6 photos, 1 data page, 1 photo caption page HAER No. MA-4-B, "Hamilton Canal, Wasteway Gatehouse", 1 photo, 1 data page, 1 photo caption page HAER No. MA-5, "Western Canal", 3 photos, 1 data page, 1 photo caption page HAER No. MA-5-A, "Western Canal, Hickey Hall Dam", 5 photos, 1 data page, 1 photo caption page HAER No. MA-5-B, "Western Canal, Tremont Gatehouse", 4 photos, 1 data page, 1 photo caption page HAER No. MA-5-C, "Western Canal, Guard Gates", 4 photos, 1 data page, 1 photo caption page HAER No. MA-6, "Lawrence Canal, Lawrence Dam", 3 photos, 1 data page, 1 photo caption page HAER No. MA-7, "Eastern Canal", 5 photos, 1 data page, 1 photo caption page HAER No. MA-7-A, "Eastern Canal, Boott Dam", 3 photos, 1 data page, 1 photo caption page HAER No. MA-7-B, "Eastern Canal, Boott Penstock", 2 photos, 1 data page, 1 photo caption page HAER No. MA-8, "Northern Canal", 7 photos, 1 data page, 1 photo caption page HAER No. MA-8-A, "Northern Canal, Pawtucket Gatehouse", 16 photos, 1 measured drawing, 1 data page, 2 photo caption pages HAER No. MA-8-B, "Northern Canal, Great River Wall", 14 photos, 1 data page, 2 photo caption pages HAER No. MA-8-C, "Northern Canal, Waste Gates", 8 photos, 5 measured drawings, 1 data page, 1 photo caption page HAER No. MA-9, "Moody Street Feeder", 2 photos, 1 data page, 1 photo caption page HAER No. MA-9-A, "Moody Street Feeder, Gatehouse", 6 photos, 4 data pages, 1 photo caption page

Illustrations

Worked examples

Example 1 — a first encounter with Lowell Power Canal System and Pawtucket Gatehouse

Start with the simplest possible case. Write down what Lowell Power Canal System and Pawtucket Gatehouse claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lowell Power Canal System and Pawtucket Gatehouse before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lowell Power Canal System and Pawtucket Gatehouse ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lowell Power Canal System and Pawtucket Gatehouse

In research: Lowell Power Canal System and Pawtucket Gatehouse appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lowell Power Canal System and Pawtucket Gatehouse in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lowell Power Canal System and Pawtucket Gatehouse is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1821 establishments in Massachusetts, Canals in Lowell, Massachusetts, Canals on the National Register of Historic Places in Massachusetts, so understanding it makes those chapters shorter.
In everyday life: Look for Lowell Power Canal System and Pawtucket Gatehouse outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lowell Power Canal System and Pawtucket Gatehouse in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lowell Power Canal System and Pawtucket Gatehouse means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Lowell Power Canal System and Pawtucket Gatehouse in simple terms?

The Lowell Power Canal System is the largest power canal system in the United States, at 5.6 miles in length. It is operating through six major canals on two levels, controlled by numerous gates.

Why does Lowell Power Canal System and Pawtucket Gatehouse matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lowell Power Canal System and Pawtucket Gatehouse?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lowell Power Canal System and Pawtucket Gatehouse.