Mathematics Quiz on Outflows
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Questions and Answers

What was the total amount of runoff generated from the catchment area after the storm?

  • 150,000 m3
  • 90,000 m3
  • 54,000 m3 (correct)
  • 10,000 m3

    • What is the primary factor that affected the availability of water for runoff in the described scenario?

  • Evaporation rates
  • Surface runoff capacity
  • Amount of rainfall
  • Soil permeability (correct)

    • What is the ratio of runoff to precipitation for the given scenario?

  • 0.5
  • 0.4 (correct)
  • 0.3
  • 0.2

    • If the catchment area is 150 ha and the rainfall was 10.5 cm, how much total water fell on the catchment in cubic meters?

    <p>1,575,000 m3</p> Signup and view all the answers

    What concept describes the time it takes for water in rivers to completely replace itself?

    <p>Residence time</p> Signup and view all the answers

    What is the process by which liquid water enters the atmosphere as water vapor?

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

    Given the average discharge during the runoff event, how is the total volume of runoff calculated?

    <p>Discharge rate multiplied by time</p> Signup and view all the answers

    What percentage of atmospheric water vapor comes from evaporation?

    <p>90%</p> Signup and view all the answers

    What is the main reason the stream was dry before and after the storm event?

    <p>Net evaporation exceeding precipitation</p> Signup and view all the answers

    How does the volume equation relate to calculating the area of the catchment impacted by rainfall?

    <p>Volume equals area times height</p> Signup and view all the answers

    Which of the following factors significantly influences evaporation?

    <p>Wind speed</p> Signup and view all the answers

    What is the primary mechanism through which water exits plants?

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

    What role does evaporation play in the atmospheric energy exchange?

    <p>Humidity restoration</p> Signup and view all the answers

    Which process accounts for the majority of the water a plant transpires?

    <p>Released into the atmosphere</p> Signup and view all the answers

    What is the fundamental component of the hydrologic cycle?

    <p>Transpiration and evaporation</p> Signup and view all the answers

    Which of the following fields does hydrology NOT draw from?

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

    What defines infiltration in the context of the water cycle?

    <p>The downward entry of water into the soil or rock surface.</p> Signup and view all the answers

    Which of the following correctly describes percolation?

    <p>The flow of water through soil and porous or fractured rock.</p> Signup and view all the answers

    What does permeability refer to in the context of geology?

    <p>The property of a material to transmit a fluid.</p> Signup and view all the answers

    Which storage component is not considered an underground storage example?

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

    In the water budget equation, what does the symbol 'P' represent?

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

    What does the water budget equation primarily measure?

    <p>The total exchange of water entering and leaving a system.</p> Signup and view all the answers

    Which of these factors does NOT significantly impact storage types above and below ground?

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

    What does the continuity equation for water help to express?

    <p>The balance of mass inflow and outflow of water.</p> Signup and view all the answers

    What is the primary function of evapotranspiration in the water cycle?

    <p>To combine the processes of evaporation and transpiration</p> Signup and view all the answers

    What term describes the process by which water vapor is transformed into a liquid state?

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

    Which of the following best defines the 'dew point'?

    <p>The point where air is saturated and water vapor condenses</p> Signup and view all the answers

    What type of precipitation is defined as having a detrimental effect on ecosystems due to increased acidity?

    <p>Acid rain</p> Signup and view all the answers

    What is the primary difference between infiltration and percolation?

    <p>Infiltration refers to water movement through the soil, while percolation relates to water filtering through soil layers</p> Signup and view all the answers

    What percentage of precipitation is typically absorbed by soil?

    <p>65 percent</p> Signup and view all the answers

    What is runoff primarily responsible for in the water cycle?

    <p>Transporting sediments and pollutants to water bodies</p> Signup and view all the answers

    Which form of precipitation is always considered to be fresh water despite its source?

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

    What is the total inflow to the lake for the month in cubic meters?

    <p>22.8 x 10^6 m³</p> Signup and view all the answers

    Which factor does NOT contribute to the change in the volume of the lake's storage?

    <p>Groundwater inflow</p> Signup and view all the answers

    How is the volume of evaporation calculated for the lake?

    <p>By multiplying evaporation depth by the surface area</p> Signup and view all the answers

    What is the outflow from the lake during the month?

    <p>6.5 m³/s</p> Signup and view all the answers

    If the lake had no inflows, what would be the primary factor affecting the water level?

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

    What is the formula to calculate the total outflow in cubic meters for the month?

    <p>6.5 m³/s x (30 days x 24 hours x 60 minutes x 60 seconds)</p> Signup and view all the answers

    What was the initial water surface elevation of the lake?

    <p>103.200 m</p> Signup and view all the answers

    What impact does receiving 145 mm of rainfall have on the lake's water balance?

    <p>Adds to the inflow volume</p> Signup and view all the answers

    Study Notes

    Hydrology Overview

    • Hydrology is the scientific study of water on Earth, its distribution, occurrence, and circulation within the atmosphere.
    • It encompasses water found in lakes, streams, precipitation, snow, ice, and soil pores.

    Key Hydrological Processes

    • Evaporation: Transformation of liquid water to vapor below boiling point; accounts for 90% of atmospheric water. Influenced by temperature, humidity, wind speed, and solar radiation.
    • Transpiration: Water release from plants through stomata; only 1% of transpirated water is utilized for growth, with 99% evaporated.
    • Evapotranspiration: Combined effects of evaporation and transpiration, measuring water movement in the atmosphere.

    Precipitation and Condensation

    • Precipitation: All forms of water (liquid or frozen) that condense in the atmosphere and return to Earth, including rain, sleet, and snow.
    • Condensation: Converts water vapor back to liquid; forms dew or clouds and is influenced by air temperature and dew point temperature.

    Runoff and Infiltration

    • Runoff: Precipitation that reaches the Earth’s surface, collects, and drains into water bodies; 35% of precipitation typically undergoes runoff.
    • Infiltration and Percolation: Infiltration is the downward entry of water into soil; percolation is the flow of water through soil and rock, but not synonymous with permeability.

    Water Storage and Budget

    • Water is stored in three main places: Earth’s surface (lakes, glaciers), atmosphere, and ground (aquifers).
    • Water Budget Equation: Used to calculate water inflow, outflow, and storage. Expressed as:
      • Mass inflow - mass outflow = changes in mass storage
    • Additional water budget equation:
      • Precipitation - runoff - groundwater - evaporation - transpiration = change in storage

    Sample Problem Analysis

    • Storm In Hydrology: A catchment area of 150 ha received 10.5 cm of rainfall over 90 minutes, leading to runoff of 1.5 m³/s lasting 10 hours.
    • Calculated runoff:
      • Volume = 1.5 m³/s * (10 hours * 3600 seconds/hour) = 54,000 m³
    • Rainfall calculated:
      • Volume = 10.5 cm * (150 ha * 10,000 m²/ha) = 15,750 m³
    • Amount of water unavailable due to infiltration, evaporation, and transpiration can be computed based on the above values.

    Environmental Impact

    • Acid Rain: Precipitation contains contaminants, potentially harming aquatic ecosystems by increasing acidity levels, negatively impacting fish and plant life.

    New Elevation and Volume

    • Storage change and new water elevation can be determined from inflow and outflow calculations, using specific rates of rainfall and evaporation in water budget equations.

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    Description

    This quiz focuses on calculating outflows using given equations and values. It includes problems related to financial calculations involving inflow and outflow. Test your understanding of these concepts with this practical exercise.

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