Determine the total sanitary sewer loading for the three pipes in the subdivision shown below. Also determine the invert elevations based on the design criteria listed. What is the total peak flow into the lift station (MH - 4) in L/s? What are the full flow velocity and full flow discharge for each pipe. What is the ratio of flow depth to pipe diameter for each pipe (i.e. d/D)? Street crown elevations are shown in parentheses. School 230 students/staff 8 single family homes MH-2 (38.65 m) Pipe B 95 m Pipe A-110 m MH-3 MH-1 (38.95 m) (39.61 m) 5 single family 15 single family homes homes A restaurant with 12 employees and Pipe C 500 patrons per day 100 m Base Loading MH-4/Lift Station (38.50 m) Single family homes - 280 LCD/3 people per home School 60 LCD (per student/staff) Restaurant - 30 L/d/employee plus 10L/patron Peaking Factor - 4 Infiltration 0.5 L/d per cm of diameter per m of length. Inflow - No foundation drains but inadvertent inflow - 1 L/min/single family home and 1 L/min each from the restaurant and school Manhole inflow - 15 L/min/manhole Minimum full flow velocity - 0.6 m/s (results in minimum slope) Minimum pipe size - 250 mm Maximum depth to diameter ratio (d/D) = 0.67 Minimum pipe cover - 3.0 m Roughness n 0.013 Match pipe crowns or provide 0.03 m invert drop per manhole (whichever is greater)
Determine the total sanitary sewer loading for the three pipes in the subdivision shown below. Also determine the invert elevations based on the design criteria listed. What is the total peak flow into the lift station (MH - 4) in L/s? What are the full flow velocity and full flow discharge for each pipe. What is the ratio of flow depth to pipe diameter for each pipe (i.e. d/D)? Street crown elevations are shown in parentheses. School 230 students/staff 8 single family homes MH-2 (38.65 m) Pipe B 95 m Pipe A-110 m MH-3 MH-1 (38.95 m) (39.61 m) 5 single family 15 single family homes homes A restaurant with 12 employees and Pipe C 500 patrons per day 100 m Base Loading MH-4/Lift Station (38.50 m) Single family homes - 280 LCD/3 people per home School 60 LCD (per student/staff) Restaurant - 30 L/d/employee plus 10L/patron Peaking Factor - 4 Infiltration 0.5 L/d per cm of diameter per m of length. Inflow - No foundation drains but inadvertent inflow - 1 L/min/single family home and 1 L/min each from the restaurant and school Manhole inflow - 15 L/min/manhole Minimum full flow velocity - 0.6 m/s (results in minimum slope) Minimum pipe size - 250 mm Maximum depth to diameter ratio (d/D) = 0.67 Minimum pipe cover - 3.0 m Roughness n 0.013 Match pipe crowns or provide 0.03 m invert drop per manhole (whichever is greater)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Determine the total sanitary sewer loading for the three pipes in the subdivision shown below.
Also determine the invert elevations based on the design criteria listed.
What is the total peak flow into the lift station (MH - 4) in L/s?
What are the full flow velocity and full flow discharge for each pipe.
What is the ratio of flow depth to pipe diameter for each pipe (i.e. d/D)?
Street crown elevations are shown in parentheses.
School 230 students/staff
8 single family homes
MH-2 (38.65 m)
Pipe B
95 m
Pipe A-110 m
MH-3
MH-1
(38.95 m)
(39.61 m)
5 single family
15 single family
homes
homes
A restaurant with
12 employees and
Pipe C
500 patrons per day
100 m
Base Loading
MH-4/Lift Station (38.50 m)
Single family homes - 280 LCD/3 people per home
School 60 LCD (per student/staff)
Restaurant - 30 L/d/employee plus 10L/patron
Peaking Factor - 4
Infiltration 0.5 L/d per cm of diameter per m of length.
Inflow - No foundation drains but inadvertent inflow - 1 L/min/single family home and
1 L/min each from the restaurant and school
Manhole inflow - 15 L/min/manhole
Minimum full flow velocity - 0.6 m/s (results in minimum slope)
Minimum pipe size - 250 mm
Maximum depth to diameter ratio (d/D) = 0.67
Minimum pipe cover - 3.0 m
Roughness n 0.013
Match pipe crowns or provide 0.03 m invert drop per manhole (whichever is greater)
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