1. Water- A Fragile Resource

4. You Wanna be a Hydrologist? Deals w/ properties, distribution, and circulation of H 2 O on and below earth's surface and in air.

5. Hydrologic cycle: movement of water from atmosphere, to terrestrial areas, and back. Evaporation/Transpiration  Condensation  Precipitation  Runoff/Groundwater Replenishment Remember: Cute Video!

7. Average Residence Time Time a molecule of H 2 O spends in ocean before evaporating and rejoining H 2 O cycle = 3000 years

8. 1) Surface Water Glaciers, snow, rivers & streams, lakes & ponds, wetlands, oceans Replenished by runoff Watershed - area drained by a river

10. Los Angeles Watersh ed Drained by LA River. Emptied in LBC. DMHS

12. Malibu Watershed Malibu Lagoon-Base

13. Mississippi River Watershed

14. Areas where a river would flood. Yet, we build there? Watershed Flood Plains

15. Glaciers, Ice and Snow 75% of fresh water= ice or snow Antarctic glaciers: 85% of all ice in world

16. Muir Glacier, Alaska: 1941 and 2004

17. So. Cascade Glacier, Wash

18. Rivers and Streams Carry water to ocean (runoff) Discharge – how much water passes a pt. in a given time period. 16 largest rivers carry 50% of runoff

19. Name the world’s largest rivers…Come up with as many as you can with your partner!

21. Ponds: small, shallow temp or perm water w/surface plant growth Lakes: inland depressions holding water year-round; up to 5000ft deep Echo Park Pond?

22. Oligotrophic vs Eutrophic Lakes

23. Wetlands AKA Bogs, swamps, marshes Base of watershed Benefits: Slows H 2 O, enhances infiltration into aquifers Ballona Wetlands

24. Benefits: Fish breeding grounds.

25. Benefits: Home to migratory birds

26. Oceans 97% of all liquid water: 3 % salinity Moderates earth’s temps

31. 2) Groundwater Systems Stored water from percolation forms aquifers (pools under ground). 40% of fresh water in U.S. Aquifers: recharged by rain/snow melt

32. Unconfined Aquifer Porous rock above, clay below Replenished by surface H 2 O

33. Confined (artesian): Groundwater between impermeable layers of rock, Trapped, under pressure: SLOWLY recharged by water far away

34. Infiltration Video Clip