Flood Control and Drainage Engineering, Fourth Edition by S.N. Ghosh

By S.N. Ghosh

Primarily written as path fabric on flood keep an eye on and drainage engineering for complicated scholars of civil engineering, this new fourth variation is back completely revised. It incorporates contemporary advancements in distant sensing, details expertise and GIS expertise. New further fabric offers with flood administration as a result of Tsunami waves, flooding because of dam failure and breaking of embankments, program of dredging applied sciences, difficulties of flood forecasting, flood simple prioritization and flood risk zoning, and engineering measures for flood keep an eye on. Drainage development is tackled, with specific regard to salinity and coastal aquifer administration from the ingress of sea water. The ebook comprises layout problem-solving and case reports, making it functional and applications-oriented. the subject material could be of substantial curiosity to civil engineers, agricultural engineers, architects and city planners, in addition to different govt and non-government organizations.

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Extra info for Flood Control and Drainage Engineering, Fourth Edition

Example text

In the application of IUH in the convolution integral for relating ERH and DRH, the linearity principle requires that each infinitesimal element of ERH yield its corresponding DRH with the same lag time. This means the difference in time between the centroids, of ERH and DRH should be equal to M1. 85) where (MDRH)1 and (MERH)1 are the first moment arms respectively of ERH and DRH about the time origin. 86) where (MDRH)2 and (MERH)2 are the second moment arms respectively of DRH and ERH about the time origin.

In case the unit hydrograph is derived from very large floods then the increase may be of a very small order, if it is derived from low floods the increase may have to be substantial. 8 Design flood from IUH—Basic concepts of instantaneous unit hydrograph It may be recalled that in the earlier pages the design flood corresponding to an effective precipitation over a catchment area has been based on unit hydrograph concept. If the unit of effective precipitation becomes infinitesimally small, the resulting unit hydrograph is called an instantaneous unit hydrograph or IUH which is expressed simply by the expression u(t) (Fig.

M. 8. 75 cm and assume a constant base flow of 100 m3/s. Obtain the flood hydrograph corresponding to the above rainfall. 8 Calculation of Ordinates of Flood Hydrograph Solution of the Problem. 4 Develop a synthetic unit hydrograph of 6 hr duration for a basin of area 300 sq. km. The length of the water course as estimated from the topography is 30 km and the distance from the centroid to the stream outlet has been found to be equal to 25 km. 92 and 5 respectively. 763 hr In the problem tR = 6 hr q pR = Cp Cp A or Qp = R = 193 cumec.

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