Presentation on theme: "What is the water (hydrologic) cycle? Why is it important?"— Presentation transcript:
What is the water (hydrologic) cycle? Why is it important?
The hydrologic cycle
The Hydrologic Cycle F Water input and output is in balance globally P = R + ET
The Hydrologic Cycle F Water input and output is not always in balance locally F Something is missing F ΔS is the change in groundwater storage P = R + ET + ΔS P R + ET
The Hydrologic Cycle F Local variations can have serious consequences (floods or drought) F s/flood/flood_1.html s/flood/flood_1.html s/flood/flood_1.html F 006_05.html 006_05.html 006_05.html
Hydrologic Balance F Measuring the amount of water coming in and going out to assess availability
Precipitation (Input) F How do we measure it? F Rain gauge collects 1 inch of rain. What does that mean? F In a one-inch rain, what is the volume of water that falls on an area of one square mile? (Dont have to do the numerical calculation; just outline the steps).
Measuring Precipitation (P) F 1 inch = 1/12 feet F 1 sq. mi = 5,280 ft x 5,280 ft = 27,878,400sq.ft. F 27,878,400 sq.ft. x 1/12 feet = 2,323,200 cu.ft. F 2,323,200 cu.ft. x 7.48 gal./cu.ft = 17,377,536 gals. (17 x 10 6 gals.) F If rain fell over 1 day, the rate is 2,323,200 cu. ft. ÷ 86,400 sec/day = 26.9 cu. ft/sec.
Measuring Runoff (R) F Measure how fast the water is moving in the stream (velocity, ft./sec) width depth velocity F F velocity (ft/sec) x area (sq. ft) = cu.ft/sec F Measure the width and depth of the stream = area (sq. ft.) stream = area (sq. ft.)