advanced drainage system - Polypipe

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10 1 Figure x: Flow Chart for ks=1.5 mm 750 4.0 Flow (m 3 s -1 ) 500 0.1 450 3.0 400 375 2.0 0.01 150 1.2 100 0.001 Velocity (ms -1 ) 1.0 0.75 Gradient (1 in n) General Hydraulic Design 3.3 Figure 3.3.4 Flow Chart for ks=1.5mm 1050 300 900 600 225 10 100 1000 62
General Properties 3.4 Urban <strong>drainage</strong> pipes commonly flow part-full, with the depth of water affecting the hydraulic conditions. Figure 3.4.1 Proportional Velocity and Discharge Figure 3.4.1 gives a relationship of part pipe flow fluid velocity and discharge against full pipe flow. Once a proportional depth is determined, figure 3.4.1 may be used to determine an appropriate factor to apply to full flow values. 0.94 0.81 1.0 0.9 0.8 Q max V max 0.7 Proportional depth 0.6 0.5 0.4 0.44 Discharge (Q) Velocity (V) 0.3 0.2 0.1 0.39 0.95 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 Proportional velocity and discharge ⎧ n=2cos -1 ⎪ 1 - ⎩ 2d D ⎫ ⎪ ⎭ D A= 2 (n-sinn) 8 As can be seen from figure 3.4.1 hydraulic conditions vary with depth of pipe flow. Frictional losses occur between the pipe wall and fluid. As water depth varies, the ratio of wetted perimeter and area of flow changes. At low flow depths the ratio of wetted perimeter to flow area is high. This ratio decreases, as depth increases, until d approaches D. As the pipe flow nears full conditions, any increase in flow depth results in a significant increase of wetted perimeter compared with flow area. As can be seen in figure 3.4.1, this results in maximum flow velocity occurring at near pipe full conditions. 63
Page 1 and 2:
Uniclass G581 C1/SfB (52.3) October
Page 3 and 4:
Contents Company Introduction 3 Str
Page 5 and 6:
CONTACTS Polypipe Civils Division P
Page 7 and 8:
Ridgidrain introduction 1.1 Ridgidr
Page 9 and 10:
BBA BRITISH BOARD OF Ridgidrain AGR
Page 11 and 12: Ridgidrain Pipe Dimensions 1.2 90°
Page 13 and 14: Ridgidrain Pipe Dimensions 1.2 90°
Page 15 and 16: Pipe detail specifications Ridgidra
Page 17 and 18: Ridgidrain Pipe Design Properties 1
Page 19 and 20: Ridgidrain Installation 1.5 Standar
Page 21 and 22: Ridgidrain Installation 1.5 Midi-gu
Page 23 and 24: Ridgidrain Installation 1.5 Special
Page 25 and 26: Ridgidrain Model Specification Clau
Page 27 and 28: Ridgisewer and Polysewer Introducti
Page 29 and 30: BBA BRITISH BOARD OF AGRÉMENT CERT
Page 31 and 32: Polysewer Pipe Dimensions 2.2 45°
Page 33 and 34: Ridgisewer Pipe Dimensions 2.2 Plai
Page 35 and 36: Ridgisewer Pipe Dimensions 2.2 90°
Page 37 and 38: Ridgisewer Pipe Dimensions 2.2 11.2
Page 39 and 40: Ridgisewer Pipe Dimensions 2.2 Rock
Page 41 and 42: Ridgisewer Pipe Specification 2.3 S
Page 43 and 44: 1ess than 1.2m Road Construction St
Page 45 and 46: Ridgisewer Installation 2.5 Concret
Page 47 and 48: General Introduction and Cover Dept
Page 49 and 50: General Structural Design 3.2 Metho
Page 51 and 52: General Structural Design 3.2 Figur
Page 53 and 54: General Structural Design 3.2 Figur
Page 55 and 56: General Structural Design 3.2 It sh
Page 57 and 58: General Structural Design 3.2 Table
Page 59 and 60: General Hydraulic Design 3.3 Hydrau
Page 61: 750 500 450 375 150 100 General Hyd
Page 65 and 66: General Properties 3.4 Abrasion Res
Page 67 and 68: General Properties 3.4 Chemical Res
Page 69 and 70: General Site Instructions 3.5 Gener
Page 71 and 72: General Site Instructions 3.5 Joint
Page 73 and 74: General Site Instructions 3.5 Recom
Page 75 and 76: General Maintenance 3.6 Maintenance
Page 77 and 78: FAQ Section 3.8 What special requir
Page 79 and 80: FAQ Section 3.8 Q. How are pre-fabr
Page 81 and 82: FAQ Section 3.8 b) Spigot and socke
Page 83 and 84: References 3.9 British Standards In
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