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CE 3372 Water Systems Design

CE 3372 Water Systems Design

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CE 3372 Water Systems Design

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  1. CE 3372 Water Systems Design Lecture 24: EPA SWMM– Pumps and Lift Stations

  2. OUTLINE • Lift stations • Used to “lift” water from a low elevation to a higher elevation. • Lift provided by pumps. • Pumps modeled similar to EPA-NET • PUMPS are LINKS • The Sump is often a storage node

  3. conceptualization

  4. Lift Stations in SWMM • Lift stations are modeled as special links (like in EPA NET). • Page 40 of the SWMM manual described the conceptual model used – there are 4 “kinds” of pumps in SWMM

  5. Lift Stations in SWMM • Type 1 Pump Rule • Semi-realistic (see next slide); actual operation would likely be by stage (depth)

  6. Lift Stations in SWMM • Type 2 Pump Rule Realistic rule: can use a PLC and transducer to control the pump; assumes discharge into free (open) pipe

  7. Lift Stations in SWMM • Type 3 Pump Rule Realistic rule: Like in EPA-NET. Assumes suction and discharge submerged – discharging into a force-main. This is the “kind” of pump you had in fluids and earlier in this course.

  8. Lift Stations in SWMM • Type 4 Pump Rule Realistic rule: Archimedes (screw) pumps work exactly like this rule. Reasonably common in wastewater treatment plants for initial lift into the reactors (then gravity flow rest of plant).

  9. Lift Stations in SWMM • Woodlands Ditch C Subdivision. • As-is drainage model, using 2-yr design storm. • Suppose the goal is to keep ponding less than 2 feet.

  10. Lift Stations in SWMM 3:15 into the storm Greater than 2 feet deep Ok to be deep in the ditch

  11. Add relief sewers 3:15 into the storm Used a 8X16 box culvert To “store” water in the sewer Lift station here For the example Ok to be deep in the ditch

  12. Run once to find lift station need 3:15 into the storm Lift station here For the example Probably need 100 cfs (5 low-head pumps)

  13. Run again with the lift station 3:15 into the storm Lift station here For the example Probably need 100 cfs (4 low-head pumps)

  14. Then Check • Is such a lift station feasible? • How many pumps? • Force main diameter (4-foot this simulation), kind of big • How much power? • Other alternatives (in this case a gravity relief sewer probably makes more sense)

  15. JONES Stadium LIFT STATION IN SWMM • EXAMPLE OF ENCODING A LIFT STATION INTO SWMM

  16. JONES Stadium LIFT STATION IN SWMM • EXAMPLE OF ENCODING A LIFT STATION INTO SWMM

  17. JONES Stadium LIFT STATION IN SWMM • EXAMPLE OF ENCODING A LIFT STATION INTO SWMM

  18. JONES Stadium LIFT STATION IN SWMM • EXAMPLE OF ENCODING A LIFT STATION INTO SWMM

  19. JONES Stadium LIFT STATION IN SWMM

  20. JONES Stadium LIFT STATION IN SWMM • RUN THE MODEL (TAKES 5-MINUTES) AND CAN EXAMINE THE EFFECT OF THE PUMP(S)