What is partial duration series?
Partial duration series are series composed of all and only the high flow events which exceed a pre-determined threshold value. As such they provide the exact information for computation of recurrence intervals of large magnitudes.
What is partial duration series and annual maximum flood series?
Annual maximum series include only the highest values that occur within each year of the period of record, whereas partial duration series include all the values that occur within the period of record as long as they are higher than some threshold value.
What is effective duration?
What Is Effective Duration? Effective duration is a duration calculation for bonds that have embedded options. This measure of duration takes into account the fact that expected cash flows will fluctuate as interest rates change and is, therefore, a measure of risk.
What are key rate durations?
Key rate duration measures how the value of a debt security or a debt instrument portfolio, generally bonds, changes at a specific maturity point along the entirety of the yield curve.
What is the difference between duration and effective duration?
Effective duration is a measure of the duration for bonds with embedded options (e.g., callable bonds). Unlike the modified duration and Macaulay duration, effective duration considers fluctuations in the bond’s price movements relative to the changes in the bond’s yield to maturity (YTM).
How is AEP calculated?
The net AEP is calculated by multiplying the gross AEP with a total loss factor. The total loss factor is established by multiplying a range of different loss factors together. The main losses are: Wake losses: can be modelled using a software such as WaSP, WindPRO and WindFarmer.
What is the formula for recurrence interval?
Recurrence Intervals with Orders of Magnitude Count the total number of years on record. Use the formula: Recurrence Interval equals the number of years, plus one, divided by the magnitude rank for which you wish to calculate the recurrence interval.
What is a 50% AEP?
AEPs are to be expressed as an exceedance probability using percentage probability; for example a design rainfall will be described as having a 1% AEP. • Events that are more frequent than those with a 50% AEP will be expressed as X Exceedances per Year (EY).
What does 5% AEP mean?
For example, if a peak flood discharge of 500 m3/s has an AEP of 5%, it means that there is a 5% risk (ie, a risk of one-in-20) of a peak flood discharge of 500 m3/s or larger occurring in any one year (see also Average Recurrence Interval). Australian Height Datum. (AHD)
What is the relationship between recurrence interval and discharge?
The relation between recurrence interval and annual peak discharge should become more “linear” when it is plotted as a semi-logarithmic graph. Use EXCEL to calculate the equation of a trend line through the data. This will be a logarithmic relation because it is a semi-logarithmic plot.
What is meant by return period?
The probability that events such as floods, wind storms or tornadoes will occur is often expressed as a return period. The inverse of probability (generally expressed in %), it gives the estimated time interval between events of a similar size or intensity.