1. DLSU D is to install rapid sand filters downstream of the settling tank. The design loading rate is selected to be four times the surface per filter which is limited to 45 m?. The design capacity of the waterworks is 0.30 m³/s. Design the number and size of filters and calculate normal filtration. 2. A sieve analysis curve of a typical filter sand gives dgo= 0.99mm and UC = 1.38. What are its d10 and deo? 3. Troughs are 30ft long and width is 20% less than it length and one fourth of length is the measure to the center with horizontal flat bottom. The backwash rate is 24 in/min. Estimate (1) water depth of the troughs with free flow into the gullet, and (2) the distance between the top of the troughs and the 30-in sand bed. Assuming 40% expansion and 6in in free board in the troughs and 8 in of thickness. 4. Estimate particle size of ilmenite (sg 2x sand =5.4) and anthracite (s.g. 2/3 of sand = 1.8) which %3D have settling velocity of silica sand 0.80 mm in diameter (s.g. 2.7).

1. DLSU D is to install rapid sand filters downstream of the settling tank. The design loading rate is selected to be four times the surface per filter which is limited to 45 m?. The design capacity of the waterworks is 0.30 m³/s. Design the number and size of filters and calculate normal filtration. 2. A sieve analysis curve of a typical filter sand gives dgo= 0.99mm and UC = 1.38. What are its d10 and deo? 3. Troughs are 30ft long and width is 20% less than it length and one fourth of length is the measure to the center with horizontal flat bottom. The backwash rate is 24 in/min. Estimate (1) water depth of the troughs with free flow into the gullet, and (2) the distance between the top of the troughs and the 30-in sand bed. Assuming 40% expansion and 6in in free board in the troughs and 8 in of thickness. 4. Estimate particle size of ilmenite (sg 2x sand =5.4) and anthracite (s.g. 2/3 of sand = 1.8) which %3D have settling velocity of silica sand 0.80 mm in diameter (s.g. 2.7).

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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