Flow over sharp crested weirs lab report

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  2. LAB-2: FLOW OVER A WEIR OBJECTIVES 1. Study different types of sharp-crested weirs 2. Study the discharge over a weir 3. Calculate the discharge coefficient for sharp-crested weir experimentally on a hydraulic bench BACKGROUND In open channel hydraulics, weirs are elevated structures that are used to control outflow.
  3. In this experiment, the rectangular weirs and (V) notch weirs are been used. They consist of a sharp edges with a rectangular,(V) notch profile for the water flow. Broad-crested weirs can be observed in dam spillways where the broad edges is beneath the water surface across the entire stream. Flow measurement installation with broad- crested.
  4. Water Resources Engineering Laboratory Flow Over a Sharp Crested Weir Author Humberto Avila(PhD) 2 b = weir length or width of the channel (m). b = 0.076 m (3 in) H = Upstream head (m). The datum is located on the top of the sharp-crested weir (see Figure 1). P = Sharp-crested weir height (m) It is possible to simplify the equation 1, by using.

CHE241 - Lab Report Solteq Flow Over Weirs FM26 (2015) They consist of a sharp edged plate with a rectangular, triangular or v-notch profile for the water flow. Broad-crested weirs can be observed in dam spillways where the broad edge is beneath the water surface across the entire stream. Flow measurement installations with broad. A weir is a barrier across the width of a river or stream that alters the characteristics of the flow and usually results in a change in the height of the water level. Several types of weirs are designed for application in natural channels and laboratory flumes. Weirs can be broad-crested, short-crested, or sharp-crested Experiment (6): Flow over weirs Introduction: In open channel hydraulics, weirs are commonly used to either regulate or to measure the volumetric flow rate, they are of particular use in large scale situations such as irrigation schemes, canals and rivers 3. Sharp-Crested Weir Background A sharp-crested weir consists of a vertical flat plate with a sharp edge at the top (the crest), placed in an open channel so that the liquid must flow over the crest in order to drop into the pool below the weir. Figure 1 below shows a longitudinal section representing flow over a sharp-crested weir. Figure 1

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The stream of fluid flowing over the crest is called the nappe. Figure 2 shows a flow over a typical sharp-crested weir. Figure 2 Flow over a typical sharp-crested weir (Munson et al., 2012) The flow of fluid over the weir can be analyzed by applying continuity and Bernoulli's equations to a streamline approaching and then passing over the weir Flow Over Sharp-Crested Weir V-notch or Triangular Weir. EXPERIMENTAL SET-UP. Calibrate Two Weirs. Tap 1 (before weir) Manometer & point gage Seeking height above weir Run full range of flow rates. Profile In Rectangular Channel With Weir. Taps 1-3 before weir; tap 5, 6 & 7 after weir. Skip manometer tap 4 (under weir) Two levels between taps 4. terms of elliptic integrals of the first and second kinds. The efflux of flow over the weir is said to be indeterminate, although a discharge coefficient of 0.59 is stated. Dodge3 obtained a theoretical equation for circular sharp crested weirs, but this result is unpublished. The results of Dodge's work have been reported by Stevens4

Fig.1 Front view of Contracted Sharp Crested Rectangular Weir The pattern of flow over thin plate weir is very complex and cannot be analyzed theoretically alone. This is due to the non hydrostatic pressure distribution, turbulence, and frictional effects, and the approach flow conditions. The effect of viscosity and surface tension also become Sharp crested rectangular weirs used for discharge measurement purposes in open channel hydraulics are investigated experimentally. A series of experiments were conducted by measuring discharge and head over the weir for different weir heights for full width weir. It is seen that after a certai Flow Over Weirs . By John Fuller . Fluid Mechanics Lab . Wednesday(1-345pm) Group member: Abdur Rahaman . Abstract . The objective of this lab is to determine the characteristics of open-channel flow over, firstly, a rectangular notch and then a triangular (vee) notch, also to determine th FLOW OVER A SHARP-CRESTED WEIR -- RESULTS. Format: Memo Report [Include your team logo somewhere in the report.] SUMMARY . Present the key results and describe any major deviations from the printed procedures and why you did them. You do not need to turn in the lab procedure sheet with your report, but it is ok to add it as an attachment The common sources of errors for weir installations can be broken down into four categories:. Approach Channel; Weir Installation; Crest Condition; Downstream Conditions; Approach Channel . Flow approaching a weir installation should be no more than 0.5 fps and the upstream channel should be straight and of uniform cross-section for 20 times the maximum anticipated head (Hmax)

weir is raised by vacuum above the general water level below the weir. Thin-edged weir and sharp-crested^ weir are used to designate a weir in which the nappe, or overfalling sheet, touches only the smooth, sharp upstream corner or edge of the crest, the thickness o Measuring flow in open channels (weirs) Broad-Crested and Sharp-Crested Weirs Weirs are overflow structures that alter the flow so that: 1. Volumetric flow rate can be calculated, 2. Flooding can be prevented, or 3. Make a body of water more navigable Types of Weirs: Main Types of Weirs 1. Sharp-Crested a. Rectangular b. Triangular c. In general, the sharp crested weir has used in the hydraulic laboratories, industries and irrigation pilot schemes where highly accurate discharge measurements are required (Bagheri et al., 2009). Volumetric flow rate over a sharp crested weir (Q) under free flow condition in a channel is expressed in terms of the followin Laboratory of the Bureau of Reclamation (Reclamation) works to develop tools that simplify and improve distribution, measurement and accounting for water on western water projects. This paper presents a Microsoft® Excel spreadsheet model that can be used to compute the rating tables for sharp-crested weirs with full or partial flow contraction

This report deals only with the broad-crested weir form. Definition sketches of this weir are shown in figure 1. This study is based on existing data on flow over broad-crested weirs, and no new experi­ mental work is involved. It has not been possible to answer many questions which arise. For example Commonly, the discharge over a sharp-crested weir (Q) under free-flow conditions in an open channel is expressed in terms of the following well-known equation (Henderson, 1966): (1) Q = 2 3 C d b (2 g) 0.5 h 1.5 where b is the weir opening width, C d is the discharge coefficient, h is the head over the weir crest, and g is the acceleration due. LAB 6: Flume - Over- and undershot weirs Learning Objective : This laboratory experiment seeks for the understanding of the operation and usage of undershot and overflow weirs. The undershot weir is adjustable allowing a constant head of the upstream reservoir under uniform flow conditions, and prevents sediment buildup Provided that the weir is not submerged (downstream water level is low) the actual flow over a Broad Crested weir is given by: Qt = 1.705 b H3/2 where H = hu + V2/2g. The velocity V is the average velocity upstream of the weir, found from V = Qa/A. A = yo x b Calibration of Sharp-Crested Weirs _____ Objectives: • Verify the discharge equation and estimate discharge coefficients for a rectangular and a V-notch weir. • Measure flow data that is depend on the flow rate and shape of the weir, and use these data points to modify he equation that results from the theoretical relationships betwee

(DOC) CHE241 Fluid Mechanics- Lab Report Flow Over Weirs

3. Set up the flow over weirs apparatus on the hydraulic bench. 4. Ensure thumb nuts are securing the rectangular notch weir plate is fully secured. Note: Weirs notch have sharp edges. Take safety precautions while installing and changing weirs notch. General Shut-Down Procedures 6 1. Shut hydraulic bench flow control valve and close water. weir is raised by vacuum above the general water level below the weir. Thin-edged weir and sharp-crested^ weir are used to designate a weir in which the nappe, or overfalling sheet, touches only the smooth, sharp upstream corner or edge of the crest, the thickness o data defining the lower nappe of flow over a sharp-crested weir. Plots of ellipse axes versus approach depths, all as ratios of design head, are shown in Figure 5. If a sloping upstream face of the spillway is desirable then an ellipse the same as that for a vertical face is used, and the sloping face is attached tangent to the ellipse The rectangular sharp-crested weirs are of fundamental importance in hydraulic engineering because they serve as the simple, accurate and classical devices used both in the field and laboratory for flow measurements in the open channels. However, weirs must be calibrated experimentally before useing in the practice

Discharge formula for sharp-crested weir: 1 1/2 1 0 2() h QC gbzh z dz=−e ∫ Main assumptions in the derivation: • height of water level above weir crest is h 1 • velocity over the crest horizontal • approach velocity can be neglected Definition Sketch: Deriving Discharge Formula for Sharp-Crested Weirs Derivation of discharge equation. • Write a well organized work report with good verbal, graphical content. 2. Objectives: • Understand the flow patterns over a broad-crested weir. • Use the equation that quantifies the discharge over a broad-crested weir and be familiar with the equation by taking various values for the parameters in the equation

Application of momentum theory to broad-crested weirs results in a theoretical equation which describes submerged flow over these weirs and supplements the empirically developed equation. The efforts of many investigators who have collected both free and submerged flow data for weirs have been extensively used throughou The shape of flow (nappe) over the sharp-crested weir can be represented by the principle of projectile. A sharp-crested weir is simple to instal and frequently used as a flow measuring device in an open channel. The determination of the discharge coefficient over sharp-crested weir was conducted by . The results revealed that on the average. A solution to the modelling of flow through sharp crested weirs based on the potential flow approach was conducted by [7]. Discussion in [8] related to applying critical flow theory to curved streamlines, and the compound sharp crested weir is one of suggested shapes with a reasonable sensitivity flow in a wide range[9]

Lab 5: Flow over Sharp Crested Weir (February 10 & February 11) Lab 6: Critical Flow and Specific Energy (February 17 & February 18) Lab 7: Flow Over a Crump Weir (February 24 & February 25) Lab 8: Flow measurement and Stream Stability (Field Trip) (March 3 & March 4 The water-flowing over the weir falls in the collector. Water coming at from the collector can be directed to the sump or can be directed in to the measuring tank for measurement of flow. SPECIFICATIONS: [1] The unit is provided with following weirs: (a) Sharp-crested weir. (b) Broad-crested weir. (c) Ogee shaped weir. [2] Pump 1/2 H.P. monoblock ABSTRACT Long crested weirs are used in open-channel irrigation distribution systems to minimize fluctuations in the canal water surface above canal turnouts.The object of this report was to develop an equation for the long crested weir discharge coefficient so that the weirs could be used to measure canal flowrates.Sixty-seven different weir model

(PDF) CHE241 - Lab Report Solteq Flow Over Weirs FM26

  1. 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
  2. In a sharp-crested weir, there happens to be clinging of water to the lower side of the stream, if the discharge in the weir plate in considered unpredictable. The theory of profile flow over sharp crested weir depends on the clear springing of nappe of the weir plate as illustrated in the diagram below; Figure 1: sectional view of water flow.
  3. A rectangular weir is one type of sharp crested weir, and is of the options that can be used to meter flow rate in an open channel. The head over the weir is measured and can be used to calculate the water flow rate over the rectangular weir (and through the open channel). Two common types of sharp crested rectangular weir are the suppressed rectangular weir and the contracted rectangular weir
  4. Abstract: Compound sharp-crested weirs have been widely used for measuring discharges in open channels accurately with a reasonable sensitivity over a wide flow range. The flow characteristic over a compound sharp-crested weir is completely different to that over a single sharp-crested weir. The mos
  5. Sharp-crested weir. The crest of the weir is very sharp such that the water will springs clear of the crest. The weir plate is bevelled at the crest edges to obtain necessary thickness. And weir plate should be made of smooth metal which is free from rust and nicks. Flow over sharp-crested weir is similar as rectangular weir
Definition sketch for flow over a sharp crested weir

Experiment #9: Flow Over Weirs - Applied Fluid Mechanics

DISCASRGE OVER A BROAD CRESTED WEIR || Fluid Mechanics || etutio The flow of a liquid with a free surface over a weir in a channel is calculated numerically for thin weirs in channels of various depths, and for broad-crested weirs in channels of infinite depth. The results show that the upstream velocity, as well as the entire flow, are determined by the height of the free surface far upstream and by the. subject. This Lab manual mainly deals with the common and universal laboratory tests of Fluid (water). Centre of Pressure, Proof of Bernoulli's theorem, Flow through Venturimeter, Flow through orifice, Flow through mouthpiece, Flow over V-notch, Flow over sharp crested surface produced by flow over a fully ventilated sharp-crested weir. Reclamation (1948) and many other researchers have measured lower nappe profiles and have developed design criteria for ogee crest geometry. A properly designed and constructed ogee crest shape will result i These are much more robust than sharp-crested weirs and are used extensively for , flow measurement and water level regulation in rivers and canals (Figure 7.5a below). Height of weir and critical flow . All solid weirs work on the principle that the flow over the weir must go through the critical depth. It is the height of a weir that.

Weirs - Open Channel Flow Rate Measurement

Thus a weir is a simple but effective open-channel flow-meter. Figure shows two common weirs, sharp-crested and broad-crested, assumed. In both cases the flow upstream is subcritical, accelerates to critical near the top of the weir, and spills over into a supercritical nappe Weir contractions cause the water flow lines to converge through the notch. USBR (1997) provides equations for a standard fully contracted rectangular weir and a standard suppressed weir. The U.S. Bureau of Reclamation has conducted many weir tests over several decades using weirs with particular dimensions - usually b's in 1 ft. increments.

the discharge measurements be made for conditions of (1) bankfull flow and (2) the design flood. Weir Options One of two weir geometries may be selected for the site. One is a rectangular sharp-crested weir. The other is a V-notch sharp-crested weir. The two weirs have been delivered to the IIHR laboratory facilities for testing 1 for a class called Flow Visualization. Specifically, the objective of this particular image was to capture the movement of water flowing over a weir. The particular weir used in the image is a broad crested weir. The main driving force of this phenomenon is the pressure build up as the water runs towards the weir. As water flows from th where Q is the flow rate over the weir crest, is the weir coefficient, is the weir crest length, is the upstream water depth above the crest, and is the submergence correction factor (also referred to as the drowned flow reduction factor). A definition schematic for both the free flow and submerged flow conditions is provided in Figure 1 Triangular labyrinth weirs are nonlinear weirs used to control and pass the required discharge with low afflux in case of limited width saving the upstream countryside and costly lands from submergence. In this paper, the hydraulic performance of circular crested triangular plan form weirs under free flow conditions is experimentally studied. In this regard, twenty-seven weir models have been.

10. Report. Use the template provided to prepare your lab report for this experiment. Your report should include the following: Table(s) of raw data; Table(s) of results; Graph(s) Plot head in meters as y-axis against volumetric flow, in liters/min as x-axis. Plot hydraulic power in watts as y-axis against volumetric flow, in liters/min as x-axis The v notch weir is widely used to measure open channel flow rate. It is especially good for measuring a low flow rate, because the area of flow through the v notch becomes quite small while the head over the v notch is still a measurable value. When a v notch weir is used to meter flow, the weir equation Q = 2.49 H^2.48 can be used to calculate Q, the flow rate over the weir (and through the. Flow over Broad Crested Weirs: Comparison of 2D and 3D Models 770 Fig. 1 Definition sketch of a broad-crested weir [3]. In recent years, the characteristic of flow over broad-crested weirs has been introduced by many researches. Sarker and Rhodes [4] used the simple geometry of the rectangular broad-crested weir to tes

Lab 7 - Lab 7 Report Measurement of flow discharge in an

Hydraulics Lab Flow Over Sharp Crested Weirs. Posted on June 12, 2013 by zulkiflimustafa. Posted in Semester 5 The rectangular weir - the weir is used as a flow measuring device. Its accuracy is investigated. This is an example of how the Bernoulli (energy) This will involve a detailed report and further questions. The simplest. This is a weir having a very broad sill so that the flow of water over the sill may be compared to the flow of water in a channel. Consider the broad crested weir shown in Fig. 9.25. Let H be the head of water over the weir. Let I be the length of the weir. As the water flows over the weir, it reaches a uniform depth of flow h, over the crest

For measuring the rate of flow in a channel, a weir of known dimensions is placed across the channel and the head of flow over the weir is measured. The basic equation for flow through the weir is: This formula is applicable for sharp crested rectangular weirs without end contractions, i.e., the length of the crest are equal to the width of the. Haddadi and Rahimpour[12] investigated an experimental setup to obtain the relationships of discharge coefficient with the other dimensionless parameters for trapezoidal broad-crested side weir. Bagheri S., Heidarpour [5] investigated the water flow over sharp-crested side weirs obtaining the distribution of the three- dimensional velocity


Rapidly Varied Flow. Chapter. 1 Citations. 8.4k Downloads. The streamlines in the uniform and gradually varied flows we considered in the previous chapters are either parallel or may be assumed as parallel. Therefore, the accelerations in these flows is negligible and the pressure distribution may be assumed as hydrostatic The Weirs - Essay Example. Add to wishlist Delete from wishlist. Cite this document Summary. This essay The Weirs is about the controls or barriers placed in an open channel to permit measurement of water discharge (Encyclopedia Britannica 2009). They are the type of dams that are used to raise the level of the river of the strea

to the flow for a sharp-crested linear weir having the same channel width. As a follow-up to that work, Hay and Taylor (1970) published a design procedure for labyrinth weirs, including criteria for estimating the discharge over triangular or trapezoidal labyrinth weirs Sharp-crested weirs are the simplest form of over-flow spillway that commonly used to determine the flow rate in hydraulic laboratories, industry and irrigation systems, where highly accurate discharge measurements are needed. In this study, the experimental upper and lower nappe profiles in rectangular sharp-crested weirs are fitted by quadratic and cubic equations, respectively Module 1 Laboratory Exercise and Report. For individual submission as part of Module 1 Assignment Submit on LMS using Turnitin Submission deadline: 11:59 pm, Sunday 1 st September 2019. Characteristics of flow over a broad crested weir Introduction. Various styles of weir are used to control water levels and flow distribution in channels and. View calculated C values at Rangen. Because flow conditions over boards do not approach a sharp crested weir, at low heads, the flow will tend to impinge on the top of the boards which results in a lower C value that the standard 3.33. However, when the head, H, increases to a sufficient height s

Lab 3 - Flow Over Weirs Experiment - Fluid Mechanics

as Short Crested Weirs and passes characteristics of both the broad-crested weirs and sharp-crested weirs. Over their crest surface, the streamlines are highly curved and the pressure across the flow nape strongly deviates from hydrostatic conditions. The circular-crested weir is commonly used to measure and control open channel flow — Broad crested weir (Round corner and Sharp corner) Related theory. Wier: Depth of flow over the hump will decrease by a certain amount as there is a slight depression in the water. Compare depths with critical depth for every discharge value and report the type of flow Laboratory Investigation Of Flow Characteristics Of A Sutro Weir Get the Complete Project Materials Now! Linear proportional weirs refer to as sharp crested weir in which the discharge is linearly proportional to the head over the weir crest and tend to have high accuracy when compared with the non linear ones Water Flow Estimate Over a Weir. *cfs = cubic feet per second*gpm = gallons per minuteUse the above table to estimate the water flow over damboards or similar devices. In a stream without such a device, a wooden board (1 inch x 6 inches or 1 inch x 8 inches) can be placed on edge in the stream from bank to bank so that the water flows over the. Rectangular Contracted Weir. This calculates the water flow rate over a rectangular contracted weir. This weir has a rectangular opening where the sides are straight up and down. A contracted weir means that the ditch or canal leading up to the weir is wider than the weir opening itself. The water before the weir should be held in a relatively calm and smooth pool


Flow Over Notches and Weirs A notch is an opening in the side of a tank or reservoir which extends above the surface of the liquid. It is usually a device for measuring discharge. A weir is a notch on a larger scale - usually found in rivers. It may be sharp crested but also may hav Weir coefficients for standard, sharp-crested weirs..... page 36 y 10x 2 = y 5x 50 = y 10x 2 = y 5x 50 = xy xy. 5 August 17, 2001 Note to Students The lab report will consist of several sections. Requirements of each section are explained Height above weir (m) Flow rate (m 3 /s 2) For 1 value of discharge maintain steady flow condition in flume. 3) Install round weir in the flume. 4) Measure the depth of flow at various locations. 5) Measure the horizontal distance at each section. 6) Repeat the same procedure for various discharges. 7) Repeat the same procedure for sharp corners weir. 6) Plot the water surface profiles Measurement of discharge in open channels has been a classical topic of interest to many engineers. Sharp crested weirs are among the oldest and most convenient hydraulic structures that have been used in this field. Also, nowadays with the development of computers; attentions to numerical models have been increased and we can simulate turbulent flow using advanced numerical methods

Sharp-Crested Weirs - Sacramento Stat

crest. The liquid level over the crest is a measure of the flow rate [1]. Weirs can be classified in accordance with several criteria (shape of the opening, shape of the crest, effect of sides on the nappe) [2], but one of the most common division is that of grouping them in sharp - crested and broad - crested weirs A sharp-crested weir is essentially a vertical sharp-edged flat plate placed across the channel in a way such that the fluid must flow across the sharp edge and drop into the pool downstream of the weir plate, as is shown in Fig. The specific shape of the flow area in the plane of the weir plate is used to designate the type of weir A weir is a small dam built across a river to control the upstream water level. Weirs have been used for ages to control the flow of water in streams, rivers, and other water bodies. Unlike large dams which create reservoirs, the goal of building a weir across a river isn't to create storage, but only to gain some control over the water level The water-flowing over the weir falls In the collector. Water coming from the collector can be directed to the sump or can be directed in to the measuring tank for measurement of flow. (1) The unit is provided with following weirs: (a) Sharp·crested weir. (b) Broad-crested weir. (c) Ogee shaped weir. (2) Pump 1/2 H.P. mcnoblock

Common Sources of Error in Weir Flows - Openchannelflo

There are two broad categories of weirs. 1 Sharp-crested weirs, made of a thin plate having a sharp up- stream corner or edge so formed that the overflowing liquid springs clear of the weir crest. These are quite commonly used to meas- ure wastewater flow in treatment plants. 2 Weirs not sharp-crested. Also referred to as broad-crested weirs (ii) Sharp crested Weirs A sharp crested weir is one whose top edge (crest) is thin or beveled and presents a sharp upstream corner to the water flow. The water flowing over the weir (the weir nappe) does not contact any portion of the downstream edge of the weir, but springs past it Broad-Crested Weir . The overtopping discharge coefficient C d is a function of the submergence using the equation: . The variables K t and C r are defined in the following figures, reproduced from the manual FHWA, HDS No.5, Hydraulic Design of Highway Culverts, 1985. The first two figures are used by Subsurface Utilities to derive the base weir coefficient Cr resulting from deep and shallow. When the flow rate reached a certain level, greater than 0.015 m 3 /s, the weir plate, namely SQ-R10 or SQ-SQ, had the same flow capacity as the sharp-crested weir, meaning the flow rate could also be measured by this weir plate instead of a sharp-crested weir in a laboratory or irrigation setting

Experimental and numerical analysis of flow over a

These simulations were performed only for free flow condition. Laboratory experiments data used to model these weirs. The analytical outcomes following the weir The fourth and final semester involves a research thesis and was carried out by the author of this report, Tanvir Ahmed, at the Flanders Hydraulics Research located in Antwerp. Figure 1 (a) Flow behaviour at a channel bend and farther downstream (b) Transverse bed profiles required at a channel bend for constant q across the section (a) (b) Hydraulics of flow over sloping crested weirs The laboratory experiments were carried out in the hydraulic laboratory of Urmia University. Figure 2 shows the plan view of the channel The experiments using the Flume are the flow measurements through a broad-crested weir, sharp-crested weir, sluice gate and Parshall flume. Over the years, it has grown significantly in size, scope and apparatus. for use by the students. The works in this lab include programming, research, report writing, drafting, internet browsing etc. Each lab report is equivalent to 100 points and is due before the following lab starts. Report submitted up to 2 days late will be assessed an automatic penalty of 20%. 5 February-10 February-11 Flow Over a Sharp Crested Weir (WR Lab) 6 February-17 February-18 Critical Flow and Specific Energy (WR Lab) 7 February-24 February-25 Flow Over a.

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Venturi Meter And Orifice Meter Lab Report. It offers is directly proportional to lab abstract flow measurement with the meter: venturi meters discussed in place the solution changes with sharp crested weir and venturi meter and orifice meter lab report no intrinsic design It is therefore important that these compound weirs be calibrated for flow measurement under non-modular or submerged conditions. The purpose of the research undertaken for this WRC project is to find a method to calculate the non-modular discharge over compound weirs consisting of sluicing flumes in combination with sharp-crested and crump. Flow Measurement and Instrumentation 2014 / 08 Vol. 38 Investigation of flow characteristics above trapezoidal broad-crested weirs Madadi, Mohamad Reza , Hosseinzadeh Dalir, Ali , Farsadizadeh, Davoo Sluice Gate And Hydraulic Jump Lab Report. the energy of water over a spillway Prevents scouring on the downstream side of lab dam structure Traps air in pdf report Reverses the flow of water Maintains a high water level on the downstream side. sills pdf as sharp-crested weirs, broad-crested weirs or end sills at the bottoms of. Sharp Crested Weirs for Open Channel Flow Measurement Course.pdf. LAB (Flow Over Weirs).docx. Equation for Flow over a Broad Crested Weir with Critical Flow over the Weir Crest. Lab 9 Group Report. Enviado por. kark88. FEATI University 54th Foundation Anniversary. Enviado por