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Tuesday, July 14, 2020 | History

5 edition of Discharge characteristics of triangular-notch thin-plate weirs found in the catalog.

Discharge characteristics of triangular-notch thin-plate weirs

studies of flow to water over weirs and doms

by John Shen

  • 28 Want to read
  • 16 Currently reading

Published by U.S. Geological Survey, For sale by Supt. of Docs., U.S. Govt. Print. Off. in Washington, D.C .
Written in English

    Subjects:
  • Wiers,
  • Stream measurements

  • Edition Notes

    Bibliography: p. 39-40.

    Statementby John Shen.
    SeriesGeological Survey water-supply paper ;, 1617-B
    Classifications
    LC ClassificationsTC801 .U2 no. 1617-B, TC175 .U2 no. 1617-B
    The Physical Object
    Paginationvii, 45 p. :
    Number of Pages45
    ID Numbers
    Open LibraryOL4239684M
    LC Control Number80607045

      Discharge over triangular notch or weir - Duration: Pavika fluid says Tawi 4, views. classification of orifices and flow through orifice | fluid mechanics.   Advantages of Triangular Notch or Weir: A triangular notch or weir is preferred to a rectangular weir or notch due to following reasons: 1. The expression for discharge for a right – angled V-notch or weir is very simple. 2. For measuring low discharge, a triangular notch gives more accurate results than a rectangular. 3.

    Although the flow over side weir is a typical case of spatially varied flow, design and field engineers at times tend to estimate the discharge over side weir, using the well-established values of discharge coefficient for normal weir for simplicity.   A weir is used to measure large discharge of rivers and large canals. Weirs are of bigger size. The conditions of flow, in the case of a weir, are practically the same as those of a rectangular notch. That is why, a notch is, sometimes, called as a weir and vice versa 5. The notches are classified as; According to the shape of the opening: 1.

    Thin-Plate Weirs, when properly installed and maintained, are one of the most accurate means of measuring open channel field conditions, though, without proper sizing or regular maintenance a thin-plate weir will become increasingly less accurate over time.   Specifies methods for the measurement of water flow in open channels using rectangular and triangular-notch (V-notch) thin-plate weirs. The flow conditions considered are limited to steady, free and fully ventilated discharge. It also specifies limitations of applicability related to weir and flow geometry for the recommended equations.


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Discharge characteristics of triangular-notch thin-plate weirs by John Shen Download PDF EPUB FB2

STUDIES OF FLOW OF WATER OVER WEIRS AND DAMS DISCHARGE CHARACTERISTICS OF TRIANGULAR-NOTCH THIN-PLATE WEIRS By JOHN SHEN ABSTRACT The triangular-notch, thin-plate weir is a convenient, inexpensive, and relatively precise flow-measuring instrument.

It is frequently used to measure the flow of water inCited by: 5. Get this from a library. Discharge characteristics of triangular-notch thin-plate weirs: studies of flow to water over weirs and dams. [John Shen]. Discharge Characteristics Of Rectangular Thin-Plate Weirs.

Solution proposed for discharge characteristics, based on simple equation of discharge and experimentally derived coefficients which account for influence of fluid properties and physical characteristics of weir and weir channel; effects of viscosity and surface tension are related to increase in effective head and increase or decrease Cited by:   - Discharge Characteristics of Triangular-notch and Thin-plate weirs Civil Engineering (CE) Notes | EduRev is made by best teachers of Civil Engineering (CE).

This document is highly rated by Civil Engineering (CE) students and has been viewed times. We will determine the value of discharge dQ through the elementary horizontal strip of water. After securing the expression for discharge through the elementary horizontal strip, we will integrate the expression between the limit 0 to H and we will have the expression for the discharge over entire triangular notch or weir.

Discharge characteristics of broad-crested weirs defined by laboratory tests are described. Broadcrested weirs are classified as short, normal, or long according to the form of the water-surface profile over the weir.

The discharge equation is obtained by dimensional analysis, and the coefficient of discharge is related to dimensionless ratios that describe the geometry of the channel and the.

by [11].A thin plate weir made of d ifferent material used for experimental s tudy work by [12] to find a calibrated relationship between discharge and geometrical specifications.

A skew weirs. Calculations. The following dimensions from the equipment can be used in the appropriate calculations: – width of rectangular notch (b) = m– angle of V-notch = 90°Calculate discharge (Q) and head (h) for each experiment, and record them in the Result calculation purposes, the depth of the water above the weir is the difference between each water level reading and the.

CHE - Lab Report Solteq Flow Over Weirs FM26 (). canals and rivers. For small scale applications, weirs are often referred to as notches and invariably are sharp edged and manufactured from thin plate material.

Purpose: To investigate the discharge-head characteristics of a rectangular and triangular weirs. Apparatus: 1. Rectangular and triangular notches (Figure 2). Hydraulic bench. Determine the maximum discharge over a broad-crested weir 60 meters long having m height of water above its crest.

Take coefficient of discharge as Also determine the new discharge over the weir, considering the velocity of approach. The channel at the upstream side of the weir has a cross-sectional area of 45 sq meters. The total discharge over the whole notch may be found out only by integrating the above equation within the limits 0 and H.

A triangular notch gives more accurate results for low discharges than rectangular notch and the same triangular notch can measure a wide range of flows accurately. Discharge characteristics of triangular-notch thin-plate weirs.

Studies of flow of water over weirs and dams. Geological Survey Water-Supply Paper B, Washington D. - Flow Over Notches & Weirs | 10 Questions MCQ Test has questions of Mechanical Engineering preparation. This test is Rated positive by 94% students preparing for Mechanical MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers.

Gives methods for measuring water flow in open channels using rectangular and triangular-notch thin-plate weirs. The conditions considered are limited to steady, free and fully ventilated discharge.

Recommended discharge coefficients are applicable to water only in the approximate range of temperatures from 5 to 30 degrees C. The rectangular flume was 10 m long, m wide, and m deep.

Circulated flow was supplied from a constant head tank and discharge was measured using a calibrated V-notch thin-plate weir. The discharge ranged from to L/s in the experiments, with a range of water temperature from 18°C to 22°C. Discharge characteristics of triangular-notch thin-plate weirs: studies of flow to water over weirs and dams Water Supply Paper B.

Rao and Shukla experimentally determined the effect of the finite crest length on discharge characteristics of broad-crested weirs with square and elliptical upstream corners. Bos, M.G. () presented necessary head-discharge equations for broad-crested weirs and long-throated flumes of various cross sections in the control section.

A textbook of fluid mechanics by Dr RK bansal is available at d For a rectangular thin-plate weir, the classical discharge equation derived from energy consideration [2] can be written as follows: where Q is the discharge, w is the width of the open channel, h.

USBR () suggests using the V-notch weir equations for the following conditions: Head (h) should be measured at a distance of at least 4h upstream of the weir.

It doesn't matter how thick the weir is except where water flows over the weir through the "V." The weir should be between and inches ( to 2 mm) thick in the V.Weirs are structures consisting of an obstruction such as a dam or bulkhead placed across the open channel with a specially shaped opening or notch.

The flow rate over a weir is a function of the head on the weir. Common weir constructions are the rectangular weir, the triangular or v-notch weir, and the broad-crested weir.The triangular-notch or V notch is a thin-plate weir widely used for measuring the flow of liquids in flumes and open channels.

In permanent or portable form it is frequently used to measure the flow of water in laboratories and in small, natural streams.