GEOL 291 Lecture Notes - Lecture 9: Pan Evaporation, Dimensionless Quantity, Control Volume

• School: College of Charleston
• Department: Geology and Environmental Geosciences
• Course: GEOL 291
• Professor: Ali

Document Summary

Lecture 9: water depth and model scaling (9/22/20) Conceptually very simple accounting of water in and water out of the catchment or control volume. The difficulty comes in unequivocally measuring or estimating the components. Accurately balancing the water budget is not trivial. Runoff or discharge: field gauges, in-stream methods, correlations. The shorter the time interval, the more data that is required. Sink: flux into a reservoir > flux out = accumulation. Source: flux out of a reservoir >flux in= loss. Same units; remove the area from our calculation. Convert volume into unit depth; thus what"s water depth: Water depth (d) = volume of water (v) / surface of the field (a) Consistent units and time period for each variable. Fraction of rain that makes it out of the watershed as streamflow in a given time period (annual, storm, season, etc)