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Showing posts from September 25, 2016

SYSTEM COMPONENTS, PLANNING AND MANAGEMENT INTRODUCTION

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MODULE – 1 - SYSTEM COMPONENTS, PLANNING AND MANAGEMENT INTRODUCTION

The main sources of water supply are surface and ground water which have been used for a variety of purposes such as drinking, irrigation, hydroelectric energy, transport, recreation etc. Often, human activities are based on the „usual or normal‟ range of river flow conditions.  However, flows and storage vary spatially and temporally; and also they are finite (limited) in nature i.e., there is a limit to the services that can be expected from these resources. Rare or „extreme‟ flows or water quality conditions outside the normal ranges will result in losses to river-dependent, human activities. Therefore, planning is needed to increase the benefits from the available water sources. The purpose of water resources planning and management activities is to determine (i) How can the renewable yet finite resources best be managed and used? (ii) How can this be accomplished in an environment of uncertain supplies and uncer…

About Power - work/time.

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Power The quantity work has to do with a force causing a displacement. Work has nothing to do with the amount of time that this force acts to cause the displacement. Sometimes, the work is done very quickly and other times the work is done rather slowly. For example, a rock climber takes an abnormally long time to elevate her body up a few meters along the side of a cliff. On the other hand, a trail hiker (who selects the easier path up the mountain) might elevate her body a few meters in a short amount of time. The two people might do the same amount of work, yet the hiker does the work in considerably less time than the rock climber. The quantity that has to do with the rate at which a certain amount of work is done is known as the power. The hiker has a greater power rating than the rock climber.
Power is the rate at which work is done. It is the work/time ratio. Mathematically, it is computed using the following equation. Power = Work / time

or

P = W / t The standard metric unit of powe…

Units, dimensions and SI prefixes for terms used in physical maths

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Derived Physical Quantities: S.NoDerived Physical QuantityFormulaDimensional FormulaS.I Unit of physical quantity1.Area[]2.Volume[]3.Density[]