2021
PONDEROSA LIFT STATION REPLACEMENT
BACKGROUND The Ponderosa lift station is located within Polites Park in Post Falls, ID. The objective of this project is to replace and
DESIGN TEAM: ALEXUS CONNOR, MICHAEL SPIERS, SAM GIBSON, ALEXIS BROOKS SPONSOR: MEGHANN KOLB, EI β T-O ENGINEERS
HYDRAULIC ANALYSIS
LIFT STATION DESIGN
A combination of the Colebrook-White formula
PLAN VIEW
and Darcy Weisbach equation was used to
decommission the existing triplex lift station for future peak
establish a function for total headloss as a
flows and increased infrastructure in the surrounding
function of volumetric flow rate.
community. This design is guided by the following design
ππ =
peak flows: 5-year Peak Flow : 810 GPM 20-year Peak Flow : 1757 GPM
log
0.25
4ππ ππππππ
5.74 0.9
πππ π + 3.7π·π·
2
8ππ2 ππππ + οΏ½ πΎπΎ βππ = 2 4 ππππ π·π· π·π·
SITE PLAN PROFILE VIEW
SYSTEM CURVE 80 70
Head (feet)
60 50 40 30 20 10
HYDROLOGIC ANALYSIS
The Rational Formula was used in order to estimate surface runoff of pre- and post-development. A swale was designed in order to account for the increased flow rate from the additional impervious surfaces added to the new site. Q=CiA
COST ANALYSIS Cost Estimate Civil
$58,000
Sanitary
$281,000
Total
$339,000
ACKNOWLEDGEMENTS Meghann Kolb, EI
Fritz R. Fiedler, Ph.D., P.E. Erik R. Coats, Ph.D., P.E.
200
400 1 Pump
600
800 1000 Flow (GPM)
2 Pumps
1200
Appropriate Pump Curve
Displayed on the graph are the system curves accounting for 5-year peak flow and 20-year peak flow along with an appropriate pump curve to satisfy both conditions.
1400