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558 Chapter 15 Sewerage Systems: Modeling and Computer Applications
Table 15.1 Typical Unit Sanitary Loads from Different Sources

Base Load
Unit Sanitary Load Loading Unit (L/d per Loading Unit)
Airport Passenger 10
Apartment Resident 260
Automobile Service Employee 50
Bar Customer 8
Cabin Resort Guest 160
Campground Guest 120
Coffee Shop Guest 20
Department Store Toilet Room 2,000
Dormitory Guest 150
Home (Average) Resident 280
Home (Better) Resident 310
Home (Luxury) Resident 380
Hospital (medical) Bed 650
Hotel Employee 40
Prison Inmate 450
Restaurant Meal 10
School (Large) Student 80
School (Medium) Student 60
School (Small) Student 40
Swimming Pool Employee 40
Shopping Center Parking Space 4

Loads are peaked according to a peaking factor or extreme flow factor equations that you
select from a user-customizable extreme flow factor library.
You can use SewerCAD to design new systems and analyze the performance of exist-
ing systems. SewerCAD’s intuitive graphical editor and scenario management capabilities
facilitate the process of analyzing a large number of design alternatives and finding poten-
tial problems in an existing system. In summary, SewerCAD’s modeling techniques enable
you to:

1. Design and analyze multiple sanitary sewer networks in a single project.
2. Examine your system using SewerCAD’s gradually varied flow algorithms or a
standard capacity analysis.
3. Design the system using SewerCAD’s automatic, constraint-based design.
4. Load your model based on contributing population, service area, total sanitary
flow, or your own loading type.
5. Peak your loads using Babbitt’s, Harmon’s, or Ten-States Standards, or use your
own formulas or tables.
6. Calculate infiltration based on pipe length, diameter, surface area, length/diameter,
or user-defined data.
7. Generate plan and profile plots of a network.
8. Perform extended-period simulations that include time-variable loads and hydro-
logic routing.
9. Animate plans and profiles showing sanitary sewer system performance over time.