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Hydrostats | tonyladson

https://tonyladson.wordpress.com/2015/07/28/hydrostats

Hydrology, Natural Resources and R. For R-using hydrologists, there is a new package on CRAN that is well worth checking. Nick Bond. Has put together a collection of functions and data related to hydrologic statistics. The hydrostats package includes tools to compute commonly used streamflow indices such as:. High spells (magnitude, frequency, duration, timing etc.). There is also daily data sets for the Acheron River and Coopers Creek. If you are interested in floods, the. Acheron River, partial series.

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100-year flood: Binomial distribution | tonyladson

https://tonyladson.wordpress.com/2015/06/22/100-year-flood-binomial-distribution

Hydrology, Natural Resources and R. 100-year flood: Binomial distribution. Probability of experiencing 0, 1, 2, 3, 4 or 5 100-year (1%) floods in 100 years. Lets do a sample calculation. The probability of. Trials, where the probability of success from an individual trial is. So the probability of exactly two, 100-year floods in 100 years is:. We can also use a Binomial random variable to simulate the occurrence of floods. Check the help for. To simulate the number of 100-year floods in 100 years:. You a...

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Gippsland Lakes | tonyladson

https://tonyladson.wordpress.com/gippsland-lakes-2

Hydrology, Natural Resources and R. I’ve included here a collection of my (along with my colleagues) work on the Gippsland Lakes. Predicting tides at Lakes Entrance ( conference paper. Predicting flood heights as part of a flood warning system ( conference paper. Influence of wind on lake levels ( conference paper. Gippsland Lakes Natural Assets Report Card ( card. Importance of catchment-sourced nitrogen loads as a factor in determining the health of the Gippsland Lakes ( report. Enter your comment here.

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Hydrograph as a function | tonyladson

https://tonyladson.wordpress.com/2015/07/21/hydrograph-as-a-function

Hydrology, Natural Resources and R. Hydrograph as a function. Hydrographs are usually based on measured data but it can be useful to be able to express a hydrograph as a mathematical function. A colleague, John Fenton. Sent me this equation. The plot below shows a hydrograph where:. 1 (time of peak). Hydrograph defined by a mathematical function. The effect of the. Parameters is self explanatory;. Spreads out, or closes up, the hydrograph. The influence of the beta parameter on the hydrograph. Thanks for...

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Presentations | tonyladson

https://tonyladson.wordpress.com/presentations

Hydrology, Natural Resources and R. Links to presentations at conferences or workshops. Setting priorities for disconnection to improve stream health. Presented to the Waterway Ecosystem Research Group University of Melbourne, Oct 2013). Environmental Considerations for Stormwater Harvesting from Urban Streams. EWater conference 30 May 2012). Time to take lead contamination of rainwater tanks seriously. University of Melbourne, June 2014). Presented to the Flood Forum of Victoria, Mildura 14 Nov 2014).

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My Business | tonyladson

https://tonyladson.wordpress.com/my-business

Hydrology, Natural Resources and R. I’m a Director of Moroka. Pty Ltd a specialist consultancy that provides advice on water and catchment management. We have particular expertise in hydrology, hydraulics, water resources, waterways, fluvial geomorphology and river management. Follow this link. For a summary of our capability. M: 0408 440 028. E: tony.ladson@moroka.com.au. A: PO Box 1245, Fitzroy North Vic 3068. My full CV is here. Recent projects (where reports are publicly available). November 8, 2016.

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100-year flood: Poisson distribution | tonyladson

https://tonyladson.wordpress.com/2015/06/29/100-year-flood-poisson-distribution

Hydrology, Natural Resources and R. 100-year flood: Poisson distribution. In the previous post we considered the occurrence of 100-year floods as a Binomial random variable. We can do similar analysis using the Poisson distribution. As noted by Jones et al. Large, the Binom(. Distribution is approximately Pois(. In the examples we’ve been looking at,. Is reasonably large i.e. 100 (years). So binom(100, 0.01) is approximately pois(100 x 0.01) = pois(1). The poisson distribution can be expressed as follows:.

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100-year flood: Geometric distribution – Number of years to the next flood | tonyladson

https://tonyladson.wordpress.com/2015/07/07/100-year-flood-geometric-distribution-number-of-years-to-the-first-flood

Hydrology, Natural Resources and R. 100-year flood: Geometric distribution – Number of years to the next flood. Here we are interested in the probability distribution of the number of years,. You have a 5-year assignment to a flood-prone mining camp. What is the probability that you will experience a 100-year flood while you are living in the camp? We need the probability that we will wait 4 or fewer years before a 100-year flood. The probability that you will need to wait. Years or fewer is:. We can als...

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100-year flood: Negative Binomial distribution | tonyladson

https://tonyladson.wordpress.com/2015/07/15/100-year-flood-negative-binomial-distribution

Hydrology, Natural Resources and R. 100-year flood: Negative Binomial distribution. The negative Binomial distribution relates to independent trials and provides information on the probability of the number failures before a certain number of successes. Continuing with our flood examples, the negative Binomial distribution can be used to determine the probability of the number of flood free years before a certain number of floods occur. Is the number of flood free years, before. In any year then:. This i...