Types of Precipitation and Their Characteristics

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In a float type rain gauge, the ______ moves up as rain is collected, driving a pen to record on a chart.

float

What is the primary purpose of the siphon tube in a float type rain gauge?

  • To provide a steady flow of water to the float chamber
  • To drain excess water from the float chamber (correct)
  • To measure the intensity of rainfall
  • To prevent overflow of the float chamber

Weighing and float type rain gauges are unable to accurately measure snowfall.

False (B)

What is the main advantage of using automatic-radio-reporting rain gauges in mountainous areas?

<p>They can provide rainfall data from remote and inaccessible locations.</p> Signup and view all the answers

Match the following types of rain gauges with their primary characteristic:

<p>Float type = Uses a float to drive a pen to record rainfall Tipping bucket = Collects rainfall in buckets that tip over and send electric pulses Automatic-radio-reporting = Transmits rainfall data wirelessly Radar (WSR) = Detects and measures precipitation remotely using radio waves</p> Signup and view all the answers

Which of the following is NOT a typical type of rain gauge used in the Philippines?

<p>Hydrophone (B)</p> Signup and view all the answers

Explain how automatic rain gauges work.

<p>They measure rainfall every 10 minutes and automatically transmit the data to a collection server.</p> Signup and view all the answers

Doppler radars can only determine the location and intensity of precipitation.

<p>False (B)</p> Signup and view all the answers

Which of the following is NOT considered a form of precipitation?

<p>Sunshine (B)</p> Signup and view all the answers

What is the primary unit used to express rainfall intensity?

<p>Millimeters per hour (C)</p> Signup and view all the answers

Higher rainfall intensity can displace soil particles and lead to soil erosion.

<p>True (A)</p> Signup and view all the answers

Hail is formed by the freezing of rain drops while falling through air at subfreezing temperatures.

<p>False (B)</p> Signup and view all the answers

What term describes the length of time that rainfall occurs?

<p>Duration</p> Signup and view all the answers

What is the primary cause of convectional precipitation?

<p>Thermal convection or local whirling thunderstorms</p> Signup and view all the answers

The process where water vapour condenses to form ice crystals is known as __________.

<p>sublimation</p> Signup and view all the answers

The graphical representation of rainfall intensity over time is called a __________.

<p>hyetograph</p> Signup and view all the answers

Match the forms of precipitation with their descriptions:

<p>Drizzle = Light rain in fine drops Sleet = Frozen rain drops Dew = Moisture condensed on surfaces Fog = Thin cloud at the surface</p> Signup and view all the answers

What does a rainfall return period indicate?

<p>How often a specific rainfall amount occurs (A)</p> Signup and view all the answers

What type of front occurs when a cold air mass pushes out a warm air mass?

<p>Cold front (B)</p> Signup and view all the answers

Match the terms with their definitions:

<p>Intensity = Rate of rainfall depth Frequency = How often a rainfall occurs Duration = Length of time rainfall occurs Hyetograph = Graphical representation of rainfall intensity</p> Signup and view all the answers

Snowflakes are formed when ice crystals fused together.

<p>True (A)</p> Signup and view all the answers

Infiltration-excess runoff occurs when the soil can absorb rainfall at the same rate as it falls.

<p>False (B)</p> Signup and view all the answers

What happens to the air that gets heated close to the warm earth during convectional precipitation?

<p>It rises and cools adiabatically.</p> Signup and view all the answers

What graphical representation displays the distribution of rainfall intensity over time?

<p>Hyetograph</p> Signup and view all the answers

What does the area under the hyetograph represent?

<p>Total rainfall for that period (A)</p> Signup and view all the answers

The Symon's rain gauge can measure rainfall intensities at different time intervals throughout the day.

<p>False (B)</p> Signup and view all the answers

What is the diameter of the circular rim of Symon's rain gauge?

<p>12.7 cm</p> Signup and view all the answers

The last measurement of rainfall using Symon's rain gauge should be taken at ______ ST.

<p>08.30 hours</p> Signup and view all the answers

Match the following rain gauge types with their characteristics:

<p>Non-recording gauge = Gives daily rainfall totals only Recording gauge = Records rainfall intensity over time Symon's rain gauge = Measures rainfall with a funnel and receiver Standard measuring glass = Graduated in mm of rainfall</p> Signup and view all the answers

Which of the following is a feature of the Symon's rain gauge?

<p>It has a funnel to collect rain (D)</p> Signup and view all the answers

Rainfall measurements are usually made only once a day at 08.30 hours ST.

<p>False (B)</p> Signup and view all the answers

What is the maximum rainfall Symon's gauge can measure without overflowing?

<p>1.25 cm</p> Signup and view all the answers

What is another name for a self-recording rain gauge?

<p>Integrating rain gauge (B)</p> Signup and view all the answers

A tipping bucket rain gauge can record snowfall.

<p>False (B)</p> Signup and view all the answers

What is the purpose of the pencil point in a recording rain gauge?

<p>To draw the mass curve of rainfall.</p> Signup and view all the answers

The self-recording rain gauge is typically installed at a height of exactly ____ cm above ground surface.

<p>75</p> Signup and view all the answers

Match the following types of recording rain gauges with their characteristics:

<p>Tipping Bucket = Records water amount through tipping mechanism Weighing Gauge = Records cumulative weight of rainwater Float Gauge = Measures depth using a float mechanism Automatic Rain Gauge = Integrates data automatically</p> Signup and view all the answers

Which component of the tipping bucket rain gauge tips when it receives 0.25 mm of rainfall?

<p>Tipping buckets (B)</p> Signup and view all the answers

A weighing type rain gauge measures rainfall by using tipping buckets.

<p>False (B)</p> Signup and view all the answers

What is the diameter of the receiver used in a tipping bucket rain gauge?

<p>30 cm</p> Signup and view all the answers

What type of front is formed when two air masses are drawn simultaneously towards a low pressure area?

<p>Stationary front (D)</p> Signup and view all the answers

Cold fronts cause precipitation that is spread over a large area.

<p>False (B)</p> Signup and view all the answers

What is the phenomenon called when cold and warm fronts slide against each other?

<p>Occlusion</p> Signup and view all the answers

Orographic precipitation occurs when moist air is mechanically lifted over __________.

<p>mountain barriers</p> Signup and view all the answers

Which of the following is NOT a characteristic of precipitation important for hydrologic forecasting?

<p>Temperature (A)</p> Signup and view all the answers

Tropical cyclones are larger in diameter compared to extra-tropical cyclones.

<p>False (B)</p> Signup and view all the answers

Name two specific locations known for heavy orographic precipitation in India.

<p>Cherrapunji and Agumbe</p> Signup and view all the answers

Match the type of precipitation with its description:

<p>Stationary front = Formed at a low-pressure area by two converging air masses Orographic precipitation = Heavy precipitation on the windward side of mountains Cyclonic precipitation = Due to lifting of moist air in a low-pressure belt Cold front = Causes intense precipitation over small areas</p> Signup and view all the answers

Flashcards

Precipitation

Water particles that fall from the atmosphere to the ground.

Drizzle

Light steady rain with fine drops, intensity 0.5 mm.

Sleet

Frozen raindrops that fall through subfreezing air.

Hail

Small lumps of ice formed by alternating freezing and melting.

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Frontal Precipitation

Occurs when two contrasting air masses collide and cause condensation.

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Thermal Convection

Precipitation caused by local thunderstorms from heated air rising.

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Dew

Moisture condensed in small drops upon cool surfaces.

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Frost

A feathery ice deposit formed from frozen water vapor.

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Stationary Front

A front that forms when two air masses are drawn towards a low pressure area simultaneously, resulting in limited movement.

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Cold Front

A type of front that moves faster than warm fronts and causes intense but localized precipitation.

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Warm Front

A front that moves slower than cold fronts, leading to less intense but widespread precipitation.

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Occlusion

A phenomenon occurring when a cold front overtakes a warm front, leading to the formation of an occluded front.

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Orographic Lifting

The mechanical lifting of moist air over mountains, resulting in heavy precipitation on the windward side.

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Cyclonic Precipitation

Precipitation that occurs due to moist air lifting from low pressure areas, often forming cyclones.

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Tropical Cyclone

A type of cyclone with a small diameter causing high wind velocity and heavy precipitation, known as hurricanes or typhoons.

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Rainfall Depth

The measurement of precipitation depth in a specific area over time, critical for hydrology.

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Hyetograph

A graph that represents rainfall over time, showing the total rainfall for a period.

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Total Rainfall

The area under the hyetograph indicates the total rainfall that occurred during a given time period.

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Design Storm

A hypothetical storm used to predict extreme flooding conditions and design flood management systems.

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Rain Gauge

An instrument used to measure the amount of rainfall over time.

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Symon’s Rain Gauge

A type of non-recording rain gauge featuring a funnel and a measuring glass to determine daily rainfall amounts.

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Non-Recording Gauge

A rain gauge that measures total rainfall but does not keep a continuous record.

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Measuring Frequency

Rainfall is typically measured daily at set times, and more frequently during heavy rain to prevent overflow.

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Rainfall Intensity

The rate at which rain falls, which is not provided by non-recording rain gauges.

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Precipitation Measurement

Measured by the vertical depth of water on a level surface.

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Duration of Rainfall

Length of time that rainfall occurs, affecting infiltration and erosion.

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Effects of High Intensity

Leads to larger raindrops, more impact energy, and potential soil damage.

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Infiltration-Excess Runoff

Occurs when rainfall exceeds the soil's ability to absorb it.

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Return Period

How often rainfall occurs at a specific amount or intensity.

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Abscissa and Ordinate

Axes of a graph; time on the x-axis and intensity on the y-axis for hyetographs.

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Float Type Rain Gauge

Collects rain in a float chamber, using the float's movement to chart rainfall.

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Siphon Chamber

Where excess water siphons out once the float chamber is full.

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Clock Driven Drum

Drum that rotates every 24 hours to record rainfall data.

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Weighing Rain Gauge

Measures rain by weighing liquid or melted snow collected.

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Automatic-Radio-Reporting Rain Gauge

Used in remote areas to automatically transmit rainfall data.

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Tipping Bucket Gauge

When buckets fill, they tip, sending electric pulses to measure rainfall.

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Automatic Rain Gauge

Measures rainfall every 10 minutes and sends data to a server.

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Doppler Radar

Radar that measures precipitation intensity and wind velocity in storms.

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Recording Rain Gauge

An automatic rain gauge that records rainfall with a mechanical system.

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Self-Recording Gauge

Another name for a recording rain gauge that automatically logs rainfall.

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Weighing Gauge

A rain gauge that uses a balance to record the weight of collected rainfall.

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Float Gauge

A type of rain gauge that uses a float to measure the level of collected rainfall.

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Mass Curve of Rainfall

A graph plotted by a recording rain gauge showing cumulative rainfall over time.

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Installation Height

The recommended height of 75 cm for setting up a rain gauge.

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Calibration with Ordinary Gauge

The process of adjusting the recording gauge using a standard rain gauge.

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Study Notes

Precipitation Forms

  • Precipitation is any form of water particles falling from the atmosphere to the ground
  • Drizzle: Light, steady rain of fine drops (less than 0.5 mm), low intensity
  • Rain: Condensed water vapour falling in drops (greater than 0.5 mm)
  • Glaze: Freezing of drizzle or rain on cold surfaces
  • Sleet: Frozen rain falling through subfreezing air
  • Snow: Ice crystals formed by sublimation (water vapor directly to ice)
  • Snowflakes: Fused ice crystals
  • Hail: Small ice lumps formed by freezing and melting in turbulent air
  • Dew: Moisture condensed onto cool surfaces
  • Frost: Ice deposits from frozen water vapor
  • Fog: Thin cloud at ground level from atmospheric water vapor condensation
  • Mist: Very thin fog

Precipitation Types

  • Thermal Convection: Local thunderstorms in tropical areas. Warm air rises, cools, condenses, and forms clouds leading to storms. Called tornadoes if accompanied by destructive winds.
  • Frontal Precipitation: Occurs when two air masses (different temperatures and densities) clash. This is at the 'front', or frontal surface of contact. Cold fronts move faster and cause intense, localized precipitation. Warm fronts produce less intense, wider area precipitation. Stationary and occluded fronts result when air masses are drawn towards a low pressure area.
  • Orographic Lifting (Orographic Precipitation): Moist air is forced upward over mountains. This creates heavy precipitation on the windward side of the mountains. Example: Cherrapunji (Himalayas) & Agumbe (Western Ghats)
  • Cyclonic Precipitation: Lifting of moist air converging into a low-pressure area. This happens due to uneven heating of Earth's surface creating pressure differences that move air. Tropical cyclones (hurricanes, typhoons) and extra-tropical cyclones cause wide precipitation depending on their diameter and wind speeds.

Precipitation Characteristics

  • Depth: Rainfall depth accumulated over a specific period. Crucial for flood forecasting, water resource management, and agriculture.
  • Duration: Length of time rainfall occurs. Longer durations affect infiltration, runoff, and soil erosion.
  • Intensity: Rate of rainfall (mm/hour). High intensity can damage vegetation, lead to soil erosion, or cause flooding because of high impact energy from large raindrops.
  • Frequency: Return period indicating how often rainfall of a specific amount occurs.

Rainfall Measurement

  • Network of rain gauges (non-recording and recording types) measure precipitation
  • Symon's rain gauge: Measures total daily rainfall.
  • Recording rain gauges: Provide data on rainfall intensity and duration over time.
  • Three types of recording rain gauges: Tipping bucket, weighing type and float type.
  • Automatic radio-reporting rain gauge: Used in remote locations with no human intervention. It measures and transmit automatically and wirelessly to a remote server.

RADAR

  • Radar (Radio Detection and Ranging) is used to locate precipitation, estimate its intensity, and determine the center of tropical cyclones. Advanced Doppler radars can estimate wind strength and analyze storm structure.

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Lesson 2.1: Precipitation PDF

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