Back to Main Page (The distance O on either side of the weir must be at least 3H ** A7-2**. Discharge of standard contracted rectangular weirs in ft 3 /sec. A7-3. Discharge of standard suppressed rectangular weirs in ft 3 /sec. A7-4. Discharge of 90Â° V-notch weirs, in ft 3 /sec. A7-5. Discharge of standard Cipoletti weirs in ft 3 /sec. Shaded entries determined experimentally. Parshall Flumes A8-7. Free-flow discharge through 1.

- Head H on the weir, in m [or ft] Length L of the weir, in m [or ft] Width B of the channel, in m [or ft] Height P to the weir crest, in m [or ft] C e is a function of H/P and L/B k b is a function of L/B. Discharge Q in L/s [or cfs]. See USBR Manual for general methodolog
- e discharge (flowrate). The basic principle is that discharge is directly related to the water depth (h) in the figure above; h is known as the head
- The
**discharge****tables**here are for thin-plate**Weirs**in general. Before relying on the full flow rates indicated on the**tables**below, compare the depths indicated in the**tables**versus your application. The**tables**below have been calculated to their maximum rating and your installation may not have as much flow depth available as is shown in the. - Table 4.1 Rating Tables for rectangular Weirs in Metric Units with Discharge per Meter Width* 0.10 < b, 40.20m L = O.2m L = 0.35 m L = 0.5m L = 0.75

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 Discharge Tables. Below are the general discharge tables, equations, and minimum / maximum heads for Weir Plates commonly used in Openchannelflow Weir Boxes - they are not specific to the various standard weir box / plate combinations offered.. To determine the actual flow capacity of a standard weir box, verify the maximum head for the box and then use that in conjunction with the tables below Figure 2 - Q vs H and Calculated Q vs H Discussion The calculated discharge coefficients of the rectangular, 90 degrees, and 30 degrees weirs are 0.6554, 0.1551, and 0.02592 respectively. Weir with rectangular notch has higher discharge coefficient than V notch weir with angle between 90 degrees and 30 degrees. The discharge of 90 degrees weir increases most as the water level increase

- A.1. WEIRS A weir is a barrier in an open channel, over which water flows. A weir with a sharp upstream corner or edge such that the water springs clear of the crest is a sharp crested weir. All other weirs are classified as weirs not sharp crested. Weirs are to be evaluated using the following equation: Q = CLH 3/2 where: Q = Discharge in cf
- Table 2. Percentage increase in discharge by various rates of velocity of approach.. 159 Tables 3, 4. Discharge over a thin-edged weir by the Francis formula.... 162 Tables 5, 6. Three-halves powers..... 171 Table 7
- The rectangular-notch weir is illustrated in Figure 3. This is the oldest type of weir now in use. Its simple construction makes it the most popular. Figure - 3... The discharge equation for the rectangular-notch weir is : Equation 1 gives discharge values for rectangular-weir notch lengths of up to 4 feet and depths of flow or head of up to.
- than the partially contracted weir and full width weir. 5.1.2 Evaluation of discharge As mentioned in Section 1.13.1, the basic head-discharge equation for a rectangular sharp-crested weir is (5-1) 2 Q = CC3J2g b, hl'.' To apply this equation to fully contracted, full-width, and partially contracted thin
- Discharge characteristics of broad-crested weirs defined by laboratory tests are described. Broad- crested weirs are classified as short, normal, or long according to the form of the water-surface proÂ file over the weir. The discharge equation is obtained by dimensional analysis, and the coefficient of disÂ

- 2.10 Water discharge, Q vs Head over weir, h 12 2.11 Discharge Coefficient, C d vs h/b 13 2.12 Sectional Cross of the rectangular sharp crested weir 14 2.13 Discharge coefficient, C d vs H t /t w 16 2.14 2D free surface of the flow over the weir 17 2.15 Schematic of the Flow over the Weir 18 3.1 Sharp Crested Weir and Rectangular Open Channel
- 9.2. Calculations. The following dimensions from the equipment can be used in the appropriate calculations: - width of rectangular notch (b) = 0.03 m- angle of V-notch = 90Â°Calculate discharge (Q) and head (h) for each experiment, and record them in the Result Tables.For calculation purposes, the depth of the water above the weir is the difference between each water level reading and the.
- dimensional only, where a weir extends the whole width of the (rectangular) channel. A uniform ï¬‚ow of discharge q per unit width and depth d encounters the sharp-edged weir, whose crest at C is of height P above the bed, such that the head over the weir is H. The ï¬‚ow springs clear of the weir at C, which is where we place the co-ordinate.
- 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 Excel templates that can be downloaded from this article will each serve as a rectangular weir flow calculator. One of the Excel templates is for suppressed rectangular weir flow calculations and the other is for contracted. In each case we provide two different weir equations. If specified conditions are not met then the result from the more complicated equation gives the best estimate Weirs. Weir is defined as a barrier over which the water flows in an open channel. The edge or surface over which the water flows is called the crest. The overflowing sheet of water is the nappe. If the nappe discharges into the air, the weir has free discharge. If the discharge is partly under water, the weir is submerged or drowned The Discharge Over the Weir(Q) is a measure of the quantity of any fluid flow over unit time. The quantity may be either volume or mass is calculated using discharge = (2/3)* Coefficient of discharge rectangular * sqrt (2* Acceleration Due To Gravity)* Length * Head ^(3/2).To calculate Discharge Over the Weir(Q), you need Coefficient of discharge rectangular (C d1), Acceleration Due To Gravity. Discharge over a rectangular notch or weir The rectangular weir is able to measure higher flows than the v-notch weir and over a wider operating range. Consider rectangular notch or weir provided in a channel carrying water as shown in Figure 1. Figure 1: Rectangular weir where, H = head of water over the crest L = length of the notch or weir plates, the first one was a rectangular crested weir without a bottom orifice and considered standard. A sample of the proposed combined device is shown in Fig. 3. The descriptions of the experimental models are given in Table 1. For all models, the lower edge of the rectangular weir was 4.25 cm from the centre of the orifices

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 * Using an exponent of 1*.5 for the heads on the rectangular weir and 2.5 on the V-notch weir, compute the weir coefficients for both weirs at each experimental flow rate. Is the use of constants for the exponent and the coefficient acceptable? Compare the performance of the V-notch weir with that of the rectangular weir at both high and low flows

* As seen in Table 2, the length of side weir, L was between 0*.20 and 0.70 m to achieve the discharge coefficient of rectangular side weir. The length of the side weir (L) is an important parameter for discharge coefficient of the side weir Keywords: rectangular weir; notch: broad-crested weir; discharge coefficient; relative height of weir. 1. Introduction A weir is a type of human-made structure used mainly to regulate and measure the discharge through streams. Weirs can be classified into several types according to their shape and the construction of their crests

- e the discharge of water over a rectangular sharp-crested weir, b = 1.25 m, Y = 0.35 m, h = 1.47 m, with side walls and with end contractions. If a 90Â°V-notch weir were to replace the rectangular weir, what would be the required Y for a similar discharge
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