Lecture2 - Watersheds and the Hydrologic Cycle The Global...

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Watersheds and the Hydrologic Cycle
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The Global Hydrologic Cycle
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Water Cycle in Florida
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Florida Water Facts Surface Area = 170,452 km2 Average Rainfall = 140 cm (55”) Total Annual Rain = 238 billion m3 (62.6 trillion gallons) River and Stream = 51,858 miles Largest River = Apalachicola (Q = 25,000 ft3/s = 22 km3 /yr) Lake Area = 12,100 km2 Springs ~ 8 billion gallons/ day Groundwater supplies 95% of water 7.2 billion gallons/day; 80% to S. Florida Low relief – travel time for water (rainfall to sea) can be decades
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The Hydrologic Check-Book Mass Balance Water mass is conserved Therefore: Water In = Water Out Sources Rain, Snow, Groundwater, Human Effluent Sinks Ground, River, Atmosphere, Humans Stores Wetlands, Lakes, Rivers, Soil, Aquifers
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Budget? The basic tool of ecosystem hydrology Dynamic INFLO W OUTFLO STORAG E
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The Water Budget (Exam 1) P= Q + ET + G + ΔS Precipitation Surface runoff Evapotranspiration Groundwater Storage INFLOW OUTFLOW
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Rainfall (~ 140 cm) Infiltration to Deep Aquifer (~5 cm, though upto ~ 40 cm) Subsurface Runoff (~ 32 Interception (~ 30 cm) Transpiration (~ 70 cm) Annual Water Budget - Flatwoods Surface Runoff (~ 3 cm)
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Rainfall (~ 140 cm) Infiltration to Deep Aquifer (~5 cm, in areas much Interception (~ 15 cm) Transpiration (~ 80 cm) Annual Water Budget – Ag Land Surface Runoff (~ 20 cm) Subsurface Runoff (~ 20
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Infiltration to Deep Aquifer (~ 2 cm)
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Lecture2 - Watersheds and the Hydrologic Cycle The Global...

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