1 / 8

What is the water (hydrologic) cycle? Why is it important?

What is the water (hydrologic) cycle? Why is it important?. The hydrologic cycle. http://observe.arc.nasa.gov/nasa/earth/hydrocycle/hydro2.html. The Hydrologic Cycle. Water input and output is in balance (globally). P = R + ET. The Hydrologic Cycle.

lori
Download Presentation

What is the water (hydrologic) cycle? Why is it important?

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What is the water (hydrologic) cycle?Why is it important?

  2. The hydrologic cycle http://observe.arc.nasa.gov/nasa/earth/hydrocycle/hydro2.html

  3. The Hydrologic Cycle • Water input and output is in balance (globally) P = R + ET

  4. The Hydrologic Cycle • Local variations can have serious consequences (floods or drought) • http://observe.arc.nasa.gov/nasa/exhibits/flood/flood_1.html • http://ma.water.usgs.gov/floods/flood_2006_05.html

  5. Hydrologic Balance • Measuring the amount of water coming in and going out to assess availability

  6. Measure how fast the water is moving in the stream (velocity, ft./sec) Measuring Runoff (R) • Measure the width and depth of the stream = area (sq. ft.) velocity depth width • velocity (ft/sec) x area (sq. ft) = cu.ft/sec

  7. Precipitation (Input) • How do we measure it? • Rain gauge collects 1 inch of rain. What does that mean? • In a one-inch rain, what is the volume of water that falls on an area of one square mile?

  8. Measuring Precipitation (P) • 1 inch = 1/12 feet • 1 sq. mi = 5,280 ft x 5,280 ft = 27,878,400sq.ft. • 27,878,400 sq.ft. x 1/12 feet = 2,323,200 cu.ft. • 2,323,200 cu.ft. x 7.48 gal./cu.ft = 17,377,536 gals. (17 x 106 gals.) • If rain fell over 1 day, the rate is 2,323,200 cu. ft. ÷ 86,400 sec/day = 26.9 cu. ft/sec.

More Related