PLAN341 Lecture Notes - Lecture 9: Hydrograph, Snowmelt, Percentile
27 May 2016
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Lecture 9: streamflow, flood plains, flood hazard, and land use planning. Sending people out to sample can be expensive and dangerous. Gaging stations measure stage at rating equation. If you know height can measure q with equation. Find ways to predict how much water in the system. Laurel creek reservoir controls flooding (empty when no water, fills with rising levels) Take data from multiple years, create flow duration curve. Flow duration curves => adds up and sends out data into various percentiles. The flow duration curve is a plot that shows the percentage of time that flow in a stream is likely to equal or exceed some specified value of interest. Summary of monthly mean for the period of record. Represents average monthly discharge for a particular site. Small storms soil saturated big storm flood (example) Natural flow regime and ecological integrity of rivers. Imp factors: magnitude, frequency, duration, timing, rate of change.
