Trunk Sewer and Pump Station design in Newburgh, IN
Creators: name: Cox, Jacob
name: Vasquex, Benjamin
name: Williams, Shane
Publisher: name: Unknown
Year: 2016

description: The city of Newburgh wishes to install a new Sanitary Sewer trunk line, along
with a new lift station and force main for anticipated development in the area. The area is
located North and South of Willow Pond Road in Newburgh, IN. The decommissioning
of three operating lift stations will take place and the flow rerouted to the designed
gravity sewer trunk line and lift station. A field survey was completed to obtain ground
elevations along the proposed sewer route. The final design for the new gravity sanitary
sewer system includes: (1) Calculated flows from the developed and undeveloped areas.
A map was provided showing different mains and laterals that would make it possible to
find service areas of the lift stations that would be decommissioned. A density factor was
calculated by counting houses on a known area. The factor was used to estimate the
number of houses that would be constructed on the undeveloped area. Flows were then
calculated for all of the undeveloped land. Indiana Administrative Code gave guidance
and was used for estimating residential sanitary flow rates. Residential use was how the
area would be occupied, with exception to a school that is projected by 2021. Average,
peak, and minimum daily flows were calculated, knowing the number of houses for each
area that the land would be broken down into. Peak flows were the designing factor for
sizing pipes. (2) Suggested route and layout of the trunk line with manhole locations.
This route was chosen and justified by visiting the site and looking at elevation profiles
along the length of the ditch line that was followed to the newly designed lift station.
Surveying the site also gave justification on the route selection. Manhole locations are
required every 400 feet along the sewer, as well as changes in direction and pipe size. 
When deciding the route sudden drops in elevation were to be avoided, along with any
other obstructions to laying a pipe system, (roads, houses etc.) (3) Pipe design including
pipe diameter, pipe slope, and expected velocities. Pipe diameter was calculated using
Manning's Equation along with slope requirements provided by 2008 Town of Newburgh
Design Standards. Using these design standards, the trunk sewer was laid with minimum
slope requirements pertaining to each pipe size calculated. The velocity through each
pipe was calculated to confirm that the minimum velocity of two feet per second
provided by the Indiana Administrative Code was reached throughout the whole gravity
sewer system. (4) The lift station was designed with the required amount of storage and
consists of a wet well, valve vault, two submersible pumps, and force main to carry the
discharge to the master lift station. Pumps were chosen based on flow rate capacity and
efficiency, and ultimately, the Flygt C3300 was selected. The force main was calculated
to be twelve inches in order to maintain a velocity above two feet per second with five air
release valves placed along the route. Finally, a cost analysis was performed on the
completed design. The main expenses were force main piping ($686,587) and the new lift
station ($600,000), which includes the cost of the chosen pumps. The whole project is
projected to cost $2,842,917. A 10% contingency was applied bringing the required
budget for this project to $3,127,209.