Glossary of Water Management and Hydraulic Engineering

Welcome to your essential Glossary of Water Management and Hydraulic Engineering! This comprehensive guide is designed for students, offering clear explanations of key terms in this vital field. Understanding these concepts is crucial for anyone studying the fascinating world of water infrastructure, resource management, and environmental protection. Dive in to master the vocabulary of how we interact with and control water.

Unpacking the Glossary of Water Management and Hydraulic Engineering for Students

Water management and hydraulic engineering are interconnected disciplines focusing on the efficient and sustainable use of water resources. This section breaks down fundamental terms, from natural water processes to the massive structures engineered to control water.

The Hydrologic Cycle and Natural Water Phenomena

The hydrologic cycle, also known as the water cycle, describes the continuous movement of water on, above, and below the surface of the Earth. Key terms related to this cycle include:

• Evaporate, Evaporation: The process where water changes from a liquid to a gas and rises into the atmosphere. This is also described as transpire, transpiration when referring to water vapor released from plants.
• Condense, Condensation: The process where water vapor changes back into liquid water, forming clouds.
• Precipitate, Precipitation: Any form of water that falls from the atmosphere to the Earth's surface, such as rain, snow, or hail.
• Infiltrate, Infiltration: The process of water soaking into the ground.
• Percolate: To filter gradually through a porous surface or substance.
• Run off: Water that flows over the land surface rather than infiltrating into the ground.
• Soak: To fully absorb liquid.
• Saturate, Saturation: To completely fill with water; the state of being completely soaked.

Water's movement through the ground is also critical:

• Groundwater: Water held underground in the soil or in pores and crevices in rock.
• Water-table: The level below which the ground is completely saturated with water; the surface of the groundwater.
• Aquifer: An underground layer of water-bearing permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted using a water well.
• Well: A hole dug or drilled into the ground to obtain water.

Natural movements and phenomena of surface water include:

• Flow, maximum flow: The movement of water, often referring to a river or stream; the highest rate of flow.
• Tide: The alternate rising and falling of the sea, usually twice in each lunar day, due to the attraction of the moon and sun.
• High tide: The time when the tide is at its highest level.
• Low tide: The time when the tide is at its lowest level.
• Surge: A powerful, sweeping onward movement, often referring to a high wave or swelling water.
• Estuary: The tidal mouth of a large river, where the tide meets the stream.
• River bed: The channel or bottom over which a river flows.
• Upstream: Towards the source of a river; against the current.
• Downstream: Towards the mouth of a river; with the current.

Core Concepts in Water Management

Water management is the process of planning, developing, distributing, and managing the optimum use of water resources. This includes ensuring water supply, protecting water quality, and mitigating water-related risks.

• Water level: The height of the water surface, especially in a body of water or a well.
• Treat water: To process water to make it suitable for a specific purpose, such as drinking.
• Potable water: Water that is safe to drink.
• Wastewater: Water that has been used and contaminated, requiring treatment before release.
• Sewage: Specifically refers to wastewater from toilets, baths, showers, and sinks.
• Sewer: An underground pipe or channel used to carry sewage and sometimes surface water.
• Sewerage: The system of sewers, pipes, and pumps used to convey sewage from homes and businesses to treatment plants.
• Discharge: The volume of water flowing through a channel per unit time; also, to release water.
• Distribute, distribution: To spread or supply water from a central source to various points.
• Catchment: An area from which rainfall flows into a river, lake, or reservoir; a watershed.
• Retain water: To hold back or store water.

Challenges and risks in water management:

• Drought: A prolonged period of abnormally low rainfall, leading to a shortage of water.
• Shortage: A situation in which something needed cannot be obtained in sufficient amounts.
• Threat: A statement of an intention to inflict injury, damage, or other hostile action on someone in retribution for something done or not done.
• Flood: An overflow of a large amount of water beyond its normal limits, especially over what is normally dry land.
• Spill, spillage: To flow or cause to flow over the edge of a container; the act of spilling.
• Submerge, submergence: To cover completely with water; the state of being submerged.
• Subsidence: The gradual caving in or sinking of an area of land.
• Sink/sank/sunk: To go down below the surface of water or other liquid.
• Leak, leakage: An accidental hole or crack through which liquid enters or escapes; the amount of liquid that leaks.
• Seep, seepage: To flow or leak slowly through porous material; the process of seeping.
• Overflow: To flow over the brim or edges of a container.

Hydraulic Engineering: Structures and Solutions

Water (hydraulic) engineering deals with the design and construction of structures that control and manage water, such as dams, canals, and flood barriers. These are often referred to as hydraulic structures or water works.

Key structures and their components:

• Dam: A barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity or as a water supply.
• Arch dam: A concrete dam that is curved upstream in a horizontal direction, transferring water pressure to the canyon walls.
• Buttress dam: A dam that consists of a watertight upstream face supported by a series of buttresses or supports on the downstream side.
• Embankment dam: A dam constructed from compacted earth or rock fill.
• Earth fill dam, rock fill dam: Types of embankment dams made predominantly of earth or rock materials, respectively.
• Gravity dam: A massive concrete dam that resists the water pressure entirely by its own weight.
• Base of a dam: The lowest part of the dam structure.
• Dam core: The central, often impermeable, part of an embankment dam.
• Dam crest: The top of the dam.
• Dam failure: The collapse or rupture of a dam, leading to the uncontrolled release of water.
• Reservoir: A large natural or artificial lake used as a source of water supply.
• Aqueduct: An artificial channel for conveying water, typically in the form of a bridge supported by tall columns across a valley or gap.
• Canal, bypass canal: An artificial waterway constructed for navigation, irrigation, or drainage; a canal built to divert water around an obstacle.
• Cofferdam: A temporary watertight enclosure that is pumped dry to allow construction work below the waterline.
• Levee: An embankment built to prevent the overflow of a river.
• Lock: An enclosure in a canal or river with gates at each end, used for raising or lowering boats from one level to another.
• Sluice: A sliding gate or other device for controlling the flow of water, especially in a canal or drain.
• Spillway: A channel that carries excess water from a reservoir or dam, preventing it from overflowing the main structure.
• Weir: A low dam built across a river to raise the water level slightly or to divert water into a channel.
• Water tower: An elevated tank for storing water, used to maintain pressure in a water supply system.
• Hydroelectric power plant: A power station that generates electricity using the kinetic energy of falling water.

Engineering Processes and Terminology

Engineers in water management and hydraulic engineering also utilize specific concepts and actions:

• Anticipate: To regard as probable; expect or predict.
• Conceive: To form a plan or idea in the mind.
• Decide, decision: To make a choice from a number of alternatives; the act of making such a choice.
• Drain, drainage: To remove liquid from (something); the system by which water or other liquids are drained.
• Ensure: To make certain that something will occur or be the case.
• Exert (pressure): To apply or bring to bear (a force, influence, or quality).
• Pressure: The continuous physical force exerted on or against an object by something in contact with it.
• Uplift, upward pressure/downward pressure: An upward force exerted by a fluid on a submerged object; pressure acting in an upward or downward direction.
• Thrust: A strong push or force, often referring to a horizontal or lateral force.
• Raise: To lift or move to a higher position.
• Reach: To extend as far as; an extent or stretch of water, such as a section of a river.
• Release: To allow or enable to escape from confinement.
• River training: Engineering works aimed at improving a river's flow characteristics or maintaining its course.
• Waterproof: Impervious to water; not allowing water to pass through.
• Compacted earth: Soil or ground that has been pressed together to increase its density and stability.
• Longevity: Long existence or service; durability.
• Navigate, navigation, navigable: To plan and direct the route or course of a ship, aircraft, or other form of transport; the process or activity of navigating; (of a body of water) deep and wide enough to allow the passage of ships.

Frequently Asked Questions About Water Management and Hydraulic Engineering

What is the difference between water management and hydraulic engineering?

Water management focuses on the broader planning, allocation, and protection of water resources for various uses and environmental sustainability. Hydraulic engineering, on the other hand, is a specific branch of engineering that designs and constructs the physical structures (like dams, canals, and levees) needed to control, store, and convey water according to management plans. One plans, the other builds.

Why is understanding the hydrologic cycle important for water professionals?

Understanding the hydrologic cycle is fundamental because it describes how water moves through our environment. For water professionals, it's crucial for predicting water availability, managing flood risks, designing drainage systems, and understanding the impacts of climate change on water resources. It informs decisions about everything from aquifer recharge to reservoir capacity.

What are the main types of dams and their purposes?

The main types of dams mentioned are arch dams, buttress dams, embankment dams (including earth fill and rock fill), and gravity dams. Their primary purposes include creating reservoirs for water supply, flood control, irrigation, and generating hydroelectric power. Each type is chosen based on the site's geology, available materials, and the required scale of the project. For example, a gravity dam relies on its sheer mass, while an arch dam transfers pressure to the canyon walls.