Chapt10

2 m long neglect v22g 1 solution part a we are given

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: coefficient: v v Cd | Q/(by1) For a round-nosed broad-crested weir, Eq. (10.57) applies. For an unfinished cement surface, read 2.4 mm from Table 10.1. Then the displacement thickness is * L | Ans. (a) e-Text Main Menu | 0.544 1 0.00994 0.6 m/1.2 m Textbook Table of Contents | 3/2 0.528 Study Guide 0.00994 692 Chapter 10 Open-Channel Flow The estimated flow rate is thus Q Cdb gH3/2 0.528(4 m) (9.81 m2/s)(0.6 m)3/2 3.07 m3/s Ans. (b) Check that H/L 0.5 0.7 as required. The approach Reynolds number is V1H/ 2.9 E5, just barely below the recommended limit in Eq. (10.57). Since V1 0.5 m/s, V2/(2g) 0.012 m, so the error in taking total head equal to 0.6 m is 1 about 2 percent. We could correct this for upstream velocity head if desired. Other Thin-Plate Weir Designs Weirs are often used for flow measurement and control of artificial channels. The two most common shapes are a rectangle and a V notch, as shown in Table 10.2. All should be fully ventilated and not drowned. Table 10.2a shows a full-wi...
View Full Document

Ask a homework question - tutors are online