What is PMP in hydrology?
Probable maximum precipitation (PMP) is a theoretical concept that is widely used by hydrologists to arrive at estimates for probable maximum flood (PMF) that find use in planning, design and risk assessment of high-hazard hydrological structures such as flood control dams upstream of populated areas.
What is meant by PMP over a basin?
Probable Maximum Precipitation (PMP) is ‘the greatest depth of precipitation for a given duration meteorologically possible for a design watershed or a given storm area at a particular location at a particular time of year, with no allowance made for long-term climatic trends’ .
What is the difference between PMP and PMF?
PMP is used for the calculation of Probable Maximum Flood (PMF) which is then used for the design of hydraulic structures, such as large dams and spillways, flood control works, levees, and nuclear power plants. PMF is used to size the hydraulic structures such that the risk of their failure is minimized.
How do you calculate probable maximum flood?
The PMF is computed by using the Probable Maximum Storm (PMS) which is an estimate of the physical upper limit to storm rainfall over the catchment. This is obtained from the studies of all the storms that have occurred over the region and maximizing them for the most critical atmospheric conditions.
How is PMP calculated?
Costs can be estimated using the methods that are available in the Time Management concept. One-point estimating, analogous estimating, parametric estimating, and three-point (PERT) estimating. Another method of estimation that we will now study is bottom-up estimating technique.
What is overland flow in the water cycle?
Overland flow is the movement of water over the land, downslope toward a surface water body. Overland flow is a very important aspect of the water cycle and can be generated under two different physical mechanisms.
What is standard project storm?
The standard project storm (SPS) is. … a relationship of precipitation versus time that is intended to be reasonably characteristic of large storms that have or could occur in the locality of concern. It is developed by studying the major storm events in the region, excluding the most extreme.
What is Standard Project flood?
[′stan·dərd ′präj‚ekt ‚fləd] (hydrology) The volume of streamflow expected to result from the most severe combination of meteorological and hydrologic conditions which are reasonably characteristic of the geographic region involved, excluding extremely rare combinations.
What does a 500 year storm mean?
The “500-year flood” corresponds to an AEP of 0.2-percent, which means a flood of that size or greater has a 0.2-percent chance (or 1 in 500 chance) of occurring in a given year.