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The performance of a  #dam  under  #earthquake  loading depends on various factors such as the dam  #design ,  #construction  quality, foundation conditions, seismic hazard, and intensity of ground shaking and the same is controlled by the tensile strength of the concrete, by tensile crack propagation. But, the actual tensile strength used in the performance evaluation of the dam should be determined by taking into account the effects of lift joints. The ultimate tensile strength of the parent concrete (concrete without joints) obtained from static load testing must be adjusted to account for lower strength at construction joints and strain rate effects. It is not reasonable to expect the bonding at construction joints to be equal to that of the parent concrete. The tensile strength of conventional mass concrete joints cleaned by a high-pressure water jet is approximately 70% of the tensile strength of the parent concrete as per  #USACE   EM ...

 Problem Statement:  Estimate the magnitude of flood having a recurrence interval of 100 years by Gumbel’s method. Step-1 a. Data is arranged in descending order and calculate Ǭ and σ for the series of the noted maximum flood discharges. b. The magnitude of the flood corresponding to a given recurrence interval T may be estimated as described below Ǭ (Arithmetic mean of all the flood discharges in series) = ΣQ /n = 1843 = 1894.481 Step-2 a. For a given each value of T calculate yT by using the below equation: b. Calculate Reduced mean Ȳn and Reduced Standard deviation (Sv) using the below table: Step-3 a. For a given value of T calculate yT b. Determine the value of KT by using below equation and follow table c. Calculate flood of magnitude QT has recurrence interval T using the below equation Happy Learning!  Download Excel File for Flood Frequency Analysis Download Book: Water Resource Engineering  

  Introduction An area capacity curve, also known as a reservoir capacity curve or a capacity-elevation curve, is a graphical representation of the relationship between the water surface elevation of a dam or reservoir, and the corresponding area of the reservoir that is flooded. The curve is typically plotted with the water surface elevation on the y-axis and the corresponding area of the reservoir on the x-axis. In dam projects, the area capacity curve is used to determine the storage capacity of a reservoir at various water surface elevations. This information is important for the design and operation of the dam, as it determines the amount of water that can be stored in the reservoir at different times of the year, and how much water can be released to meet downstream demands. The curve is also useful for determining the flood control capacity of the reservoir. The area capacity curve is determined through a combination of field surveys, topographic maps, and hydrologic and hy...

INTRODUCTION   The intake structure is a hydraulic structure. Which is used to divert the water from a source (like a reservoir, river) into a conduit (like a canal, tunnel, or pipe). It also supports auxiliary appurtenance (Such as trash rack, fish screens, and bypass devices) and it may include provision for installation of the bulkhead gates or stop-log gates closure devices. TYPE OF POWER INTAKE STRUCTURE The Position and location of intake would generally depend upon the type  of development and may be classified under: A) Run-Of-the river type Intake B) Reservoir-type intake Depending on the function, an intake structure may be either submerged or extended in the form of a tower above the maximum reservoir water surface (Fig. 6B) An operating platform is needed to remove trash, maintain and clean fish screens, or install stoplog gates.  Depending on intake requirements, the entrance may be placed vertically, inclined, or horizontally. Conduit entrances should...

Find the coordinate of the location using Google Earth Mark the places or  Path Make sure, Latitude/Longitude should be in Universal Transverse Mercator (UTM) Save the location as a KML file and Remember Zone Open Global Mapper Software Open data file (Saved KML file) Select an online data Source as SRTM or ASTER and connect it Analysis Option > Generate Contours (using terrain grid)  Enter the Contour interval and press OK Go to file > Export >  Export vector/ Lidar Format > DWG Download Global Mapper Software for Free

 As per IS 6966-(Part-1) the discharge of  barrage or weir is calculated using below formula: Calculation of discharge capacity of the barrage

CAUSES OF FAILURE OF BARRAGE AND THEIR REMEDIES | DAM | BARRAGE | WEIR The weir and barrage failure may take place due to the following reasons Piping or undermining. Rupture of the floor due to uplift . Rupture of the floor due to suction caused by standing wave . Scour at U/S and D/S side of weir floor . 1. Piping or undermining When water seeps under the base of the weirs founded on the permeable soils, emerges out at the D/S end of the impervious floor of the weir, hydraulic gradient or exit gradient may exceed a certain critical value for the foundation soil, the soil starts boiling at the exit point. Boiling of the soil indicates lifting of the soil against gravity and it happens only when exist gradient of seeping water is greater than the safe limit for the foundation soil. The soil gets wash out with percolating water. This process of erosion of soil from below the foundation, progressively, works backward towards the U/S. This process ultimately develops a channel or pi...