Lecture 2 - 1 ERS 482/682 (Fall 2002) Water balance ERS 482/682 Small Watershed Hydrology.

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Presentation transcript:

Lecture ERS 482/682 (Fall 2002) Water balance ERS 482/682 Small Watershed Hydrology

Lecture ERS 482/682 (Fall 2002) Fundamental Law Conservation of mass –Mass is neither created nor destroyed. S I Q

Lecture ERS 482/682 (Fall 2002) Conservation of mass S I Q

Lecture ERS 482/682 (Fall 2002) Conservation of mass S i q t i t q t S

Lecture ERS 482/682 (Fall 2002) Conservation of mass S i q Application in hydrology: Water balance

Lecture ERS 482/682 (Fall 2002) How much water is there? Figure 1.1 (Viessman and Lewis 1996)

Lecture ERS 482/682 (Fall 2002) How much water is there? ComponentUSGSUNESCO (1990) Oceans97.09%93.93% Glaciers1.99%1.65% Groundwater0.62%4.12% Atmosphere0.29%0.001% Lakes0.012%0.016% Soil moisture0.004%0.005% Rivers0.0001% Total100%99.72%

Lecture ERS 482/682 (Fall 2002) Water balance Figure 2-3 (Dingman 2002)

Lecture ERS 482/682 (Fall 2002) Water balance 0 0 runoff Figure 2-3 (Dingman 2002)