Chapter 3 -Hydrology
This presentation is the property of its rightful owner.
Sponsored Links
1 / 6

Chapter 3 -Hydrology Hwk#3 - pp. 85-87 2,4,7,11 Hydrologic Cycle Runoff - Ground Surface Water PowerPoint PPT Presentation


  • 59 Views
  • Uploaded on
  • Presentation posted in: General

Chapter 3 -Hydrology Hwk#3 - pp. 85-87 2,4,7,11 Hydrologic Cycle Runoff - Ground Surface Water Infiltration - Ground Penetration (percolation) Transpiration - Water goes through vegetation and then is released into the air as vapor

Download Presentation

Chapter 3 -Hydrology Hwk#3 - pp. 85-87 2,4,7,11 Hydrologic Cycle Runoff - Ground Surface Water

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Chapter 3 hydrology hwk 3 pp 85 87 2 4 7 11 hydrologic cycle runoff ground surface water

  • Chapter 3 -Hydrology

  • Hwk#3 - pp. 85-87 2,4,7,11

  • Hydrologic Cycle

  • Runoff - Ground Surface Water

  • Infiltration - Ground Penetration (percolation)

  • Transpiration - Water goes through vegetation and then is released into the air as vapor

  • Evapotranspiration - Is the combination of evaporation and transpiration (>50% of precipitation)


Chapter 3 hydrology hwk 3 pp 85 87 2 4 7 11 hydrologic cycle runoff ground surface water

Chapter 3 -Hydrology

1. Rainfall

Volume - acre-ft., hectares(ha) (V=Area x depth)

Rainfall intensity - rate at which rain falls

(in/hr. , mm/hr.)

Recurrence Interval (N) years - the average time span between identical storms over a long period of time (i.e. 5 year storm- same as return period)

Probability of occurence (1/N) - is the statistic of occurence in a single year


Chapter 3 hydrology hwk 3 pp 85 87 2 4 7 11 hydrologic cycle runoff ground surface water

  • Chapter 3 -Hydrology

  • 2. Surface Water

  • A. Water Sheds

  • Drainage Basin - Land which contributes runoff

  • to a river or stream

  • Confluence - the point at which two streams converge

  • Tributary - streams that feed into a first-order stream

Subbasin

Tributary

Drainage

Basin Outlet


Chapter 3 hydrology hwk 3 pp 85 87 2 4 7 11 hydrologic cycle runoff ground surface water

  • Chapter 3 -Hydrology

  • 2. Surface Water

  • B. Streamflow

  • Discharge - Volume per unit time

  • Hydrograph - flow response of a stream for a particular rainfall event (fig.3.15)

  • Perennial - streams that have a base flow from ground water

  • Intermittent or Ephemeral Stream-Streams that dry up after the rainfalls

  • Stage - the water surface above a referenced level

  • Weir - used to measure volume flow rate

  • Droughts - a long period of dry weather

  • MA7CD10 Flow - Minimum Average 7 Consecutive Day 10 - year flow - 90% chance that the minimum weekly discharge will be greater than the MA7CD10. Design parameter for water pollution control projects.


Chapter 3 hydrology hwk 3 pp 85 87 2 4 7 11 hydrologic cycle runoff ground surface water

Chapter 3 -Hydrology

3. Reservoirs

  • Summation Hydrograph - Determines when the reservoir is filling up or what is the minimum required storage volume. (fig. 3.20)

  • Uniform Withdrawal or Yield Line - Is the amount of water the reservoir can supply in a specific time period without going dry. (Predetermined by the demand on the reservoir)

  • Minimum Storage Volume Req’d - The minimum volume of water required in the reservoir in order to prevent a drought from depleting it.

  • Sediments behind a Dam - Causes a problem for vegetation and wildlife who rely on warmer temperatures and nutrients from silts and other deposited materials.


Chapter 3 hydrology hwk 3 pp 85 87 2 4 7 11 hydrologic cycle runoff ground surface water

Chapter 3 -Hydrology

4. Aquifers & Well Points

  • Aquifers - Is an underground stream.(fig 3.26)

  • Well Points - Perforated pipes that penetrate underground acquifers or water table

  • Darcy Law - V= K X S

  • where K - permeability coeff., mm/s

  • V - Flow velocity, mm/s

  • S - slope of the water table

  • Drawdown - The elevation distance between the pumping level and the static level.(fig. 3.28)


  • Login