GLY-1104 Lecture 7: GLY 1104 16.13-.15
Document Summary
Regional flood- upper mississippi flood 1993 factors: flat, not very permeable soil, levees failed, sand/gravel ruined farm fields, start blowing up levees to flood dangerous areas like propane field. Gauging station- a location at which stream stage is continuously measured: measurements usually taken every 15 min. Q = stream depth x stream width x stream velocity = ____m^3/s. Add up from several sections and get the discharge. ***rating curve- measured relationship between stream stage and discharge that is usually non-linear. Types of data: frequency of flows (shows yearly peak flow, flow probability. Recurrence interval the average period of time elapses between events of a given size. Ranking data- highest value = number one rank = r. F = r / (n+1) recurrence t = 1/f. Colorado river- lots of water from snowmelt: headwaters- orographic effect. Green river formerly glaciated: little left behind for the mexico. Reservoirs: lake powell and lake mead (hoover dam)
