Page 22 - Fair, Geyer, and Okun's Water and wastewater engineering : water supply and wastewater removal

JWCL344_fm_i-xxx.qxd 8/26/10 5:51 PM Page xvi

xvi Contents
14. Design of Sewer Systems 500

14.1 Drainage of Buildings 500
14.2 Gravity Sewers 502
14.2.1 Applicability 503
14.2.2 Advantages and Disadvantages 503
14.2.3 Collection of Spent Waters 503
14.3 Collection of Stormwaters 506
14.4 Combined Collection of Wastewaters and
Stormwaters 509
14.4.1 Cross-Sections 509
14.4.2 Inverted Siphons 509
14.4.3 Interceptors 512
14.4.4 Retarding Basins 512
14.4.5 Overflows 512
14.5 Choice of Collecting System 513
14.6 Design Information 514
14.6.1 Sanitary Sewers 514
14.6.2 Storm Drains and Combined Sewers 515
14.7 Common Elements of Sewer Profiles 516
14.8 Design Criteria of Sanitary Sewers 519
14.9 Layout and Hydraulic Design in Sanitary Sewerage 521
14.10 Capacity Design in Storm Drainage 524
14.10.1 Time of Concentration 525
14.10.2 Runoff Coefficients 526
14.10.3 Intensity of Rainfall 526
14.11 Storm-Pattern Analysis 528
14.12 Layout and Hydraulic Design in Storm Drainage 529
14.13 Hydraulic Design of Combined Sewers 531
14.14 Force Main Sewers 531
14.14.1 Common Modifications 532
14.14.2 Applicability 532
14.14.3 Advantages and Disadvantages 532
14.14.4 Design Criteria 533
14.15 Operation and Maintenance of Drainage Systems 535
14.15.1 Gravity Sewer System 535
14.15.2 Force Main and Lift Station 536
14.16 Safety and Hazards Prevention 537
14.16.1 Municipal Sewer Maintenance Worker Drowns Inside Sewer
Wet Well in Illinois 537
14.16.2 Sewer Worker Dies When Inflatable Sewer Plug Bursts in
Washington, D.C. 538
14.16.3 Independent Contractor Dies in Sewer Line Excavation
Engulfment, Alaska 539
14.16.4 Contract Worker Dies while Reinstalling
Sewer Line in Wyoming 540
14.16.5 Carpenter Dies When 8-Ft Trench Wall Collapses during
Sewer Pipe Replacement 541
14.16.6 Two Confined Space Fatalities Occurred during Construction
of a Sewer Line 542