## Estimating the design flood based on design storm rainfallintensity/depth

For Malaysian, we have a procedure (manual) to design flood hydrograph based on the design storm rainfall intensity, such as DID ((1976; 2010). Those manual are explained very well on the corrected procedures and methods to estimate the design flood hydrograph on the gauged and ungauged catchments. The following procedure is recommended by DID (1976) … Read more

## Import data ke HEC-DSSVue

Saya ada menyediakan tutorial yang mudah untuk memasukkan data hujan dan sebagainya ke dalam HEC-DSSVue. Program ini boleh didownload dari HEC dan digunakan untuk membantu perisian HEC yang lain seperti HEC-HMS dan HEC-RAS. Berikut tutorial dalam bahasa:

## Calculate Flood/Rainfall Frequency from cumulative distributionfunction (CDF) of the distribution

Specifically, we will use the cumulative distribution function (CDF) of the fitted distribution to calculate the annual exceedance probability (AEP), or the probability that the event is equaled or exceeded in any single year. For example, considering a 200,000 cfs level, the exceedance probability is calculated in the following way: Exceedance_P = P{X≥200} = 1 … Read more

## Exceedance Probability

Introduction Sometimes a hydrologist may need to know what the chances are over a given time period that a flood will reach or exceed a specific magnitude. This is called the probability of occurrence or the exceedance probability. Let’s say the value “p” is the exceedance probability, in any given year. The exceedance probability may … Read more