City of St. Pete Beach Model Capacity Report Addendum

Transcription

1 Model Capacity Report - Addendum City of St. Pete Beach Model Capacity Report Addendum Prepared for: City of St. Pete Beach 155 Corey Avenue St. Pete Beach, FL Prepared By: Kimley-Horn and Associates, Inc. 655 North Franklin Avenue, Suite 150 Tampa, FL Jordan W. Walker, P.E. FL #78652 Kimley-Horn and Associates, Inc. CA January 2017 Tampa, Florida THIS DOCUMENT, TOGETHER WITH THE CONCEPTS AND DESIGNS PRESENTED HEREIN, AS AN INSTRUMENT OF SERVICE, IS INTENDED ONLY FOR THE SPECIFIC PURPOSE AND CLIENT FOR WHICH IT WAS PREPARED. REUSE OF ANY IMPROPER RELIANCE ON THE DOCUMENT WITHOUT WRITTEN AUTHORIZATION AND ADAPTATION BY KIMLEY-HORN AND ASSOCIATES, INC. SHALL BE WITHOUT LIABILITY TO KIMLEY-HORN AND ASSOCIATES, INC. The entirety of this report, including text and images, is the property of Kimley-Horn and Associates, Inc. protected under U.S. copyright law. Copyright 2017, Kimley-Horn and Associates, Inc.

2 Authorization On February 24, 2015 the St. Pete Beach City Commission authorized the City Manager to engage the services of Kimley-Horn and Associates, Inc. (Kimley-Horn) to provide general engineering services for the Inflow and Infiltration Study. Task 4 included the following scope to create a hydraulic and statistical model of the City s sanitary sewer system with the following goals: The Engineer will develop a hydraulic and statistical model using the management software package, Bentley SewerGEMS (Bentley SewerGEMS, 2015), to analyze the City s entire sanitary sewer system. Model will be developed using the following data sources. Determine remaining flow capacity within the system for a maximum of 3 projected scenarios Identify potential problem areas and recommendations for future capital improvement plans to fix outstanding issues. Create a City wide map showing capacity ratings at each lift station and within existing gravity pipes and force mains. This Model Capacity Report was completed in September 2016 and was published via the City of St. Pete Beach s website. Along with the sewer capacity within the limits of St. Pete Beach, the City also requested a summary of the sewer capacity of the force main pressure system downstream of the Pump Station No. 1 (PS#1). Combined Pressure System All the City of St. Pete Beach s sewer flows discharge to PS#1 which is part of a combined force main pressure system that eventually outfalls to the City of St. Petersburg Lift Station No. 61. There are five separate lift stations, including PS#1, that are connected to the combined force main prior to Lift Station #61 per the City of St. Petersburg LS#61 Technical Memorandum completed by Boyle Engineering Corporation (Boyle, 2006). Estimated Pump Capacity Using the information from the City of St. Petersburg LS#61 Technical Memorandum completed by Boyle Engineering Corporation and updated information from the PS#1 rehabilitation, completed in August 2014, a hydraulic model was developed to estimate the pumping capacity of PS#1. The total pumping capacity of the station with three pumps in service and one pump as a common backup is 7.92 Million Gallons Per Day (MGD) at 145 feet of total dynamic head (TDH) under peak operating conditions. The estimated pumping capacity was calculated by use of the hydraulic model which accounts for the back pressure of the contributing pump stations that manifold into the combined force main discharging to the City of St. Petersburg s Lift Station #61. See Figure 1 for a graphical summary and Appendix A for the model results. Calculations are subject to change with conditions that may occur within the force main system. City of St. Pete Beach Model Capacity Report Addendum January

3 Figure 1 Hydraulic Model Summary City of St. Pete Beach Model Capacity Report Addendum January

4 Estimated Peak Hourly Flow (PHF) The Pump Station No. 1 Preliminary Design Report and the Model Capacity Report completed by Kimley- Horn and Associates, Inc. estimates Peak Hourly Flow (PHF) into PS#1 is approximately 7.7 MGD (Kimley-Horn and Associates, Inc. 2016) (Kimley-Horn and Associates, Inc. 2013). This estimated peak hourly flow is anticipated to decrease as the City of St. Pete Beach reduces its inflow and infiltration through their three major rehabilitation projects approved in October 2016 listed below: Wastewater System Point Repairs Project Wastewater System Pipe Lining Project Wastewater System Manhole Rehabilitation Project Conclusion In conclusion, Master Pump Station No. 1 has a peak flow rate of 7.7 MGD and a pumping capacity of 7.92 MGD; resulting in 0.22 MGD of additional capacity during a peak flow scenario. References 1. Bentley SewerGEMS (Version V8i Select Series 5 ( ). (2015). Watertown CT. 2. Boyle Engineering, Inc. City of St. Petersburg LS#61/Pasadena Master Technical Memorandum. Tampa, FL, September Kimley-Horn and Associates, Inc. City of St. Pete Beach Model Capacity Report. Tampa, FL, September Kimley-Horn and Associates, Inc. Pump Station #1 South Wetwell Pump Replacement Preliminary Design Report. Tampa, FL, August City of St. Pete Beach Model Capacity Report Addendum January

5 APPENDICES

6 APPENDIX A: Model Results

7 34 2. GD M (N /A) MG D MGD Scenario: Proposed All Pumps On D G MG D 2.0 0M GD M 1.20 MGD 0.72 MGD MG D 2.64 MGD MGD Pressure Model-Formatted.stsw 1/14/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

8 Scenario: Proposed All Pumps On P MGD P MGD P-9 MGD P MGD P MGD P MGD P MGD P MGD Pressure Model-Formatted-Ind.stsw 1/18/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

9 P MGD 7.92 MGD Scenario: Proposed All Pumps On P-8 P-44 MGD P MGD Pressure Model-Formatted-Ind.stsw 1/18/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

10 Scenario: Proposed All Pumps On P-20 MGD P-19 MGD P MGD Pressure Model-Formatted-Ind.stsw 1/18/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

11 P MGD Scenario: Proposed All Pumps On P MGD P-44 MGD P MGD Pressure Model-Formatted-Ind.stsw 1/18/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

12 Scenario: Proposed All Pumps On P MGD Pressure Model-Formatted-Ind.stsw 1/18/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

13 Scenario: Proposed All Pumps On P MGD P MGD Pressure Model-Formatted-Ind.stsw 1/18/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

14 Label J-1 J-4 J-5 J-7 J-9 J-10 J-11 - TI MP #4 J-12 J-14 J-15 J-19 J-21 J-22 J-23 J-24 J-25 J-26 J-28 Elevation (Ground) Elevation FlexTable: Pressure Junction Table Pressure (psi) Hydraulic Grade Pressure Model-Formatted.stsw 1/15/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD

15 FlexTable: Pressure Pipe Table Hazen-Williams C Headloss Velocity (ft/s) Flow (MGD) Minor Loss Coefficient (Unified) Diameter (in) Length Invert (Stop) Invert (Start) Label P P P , P P P P P P P P P P P P P P , P ,820.0 P P P P P P P , P P , P , P , P , P P P P , P-53 Page 1 of 1 27 Siemon Company Drive Suite 200 W Watertown, CT USA /15/2017 Bentley SewerCAD V8i (SELECTseries 5) [ ] Bentley Systems, Inc. Haestad Methods Solution Center Pressure Model-Formatted.stsw

16 Label SP-1 SP-2 NP-1 NP-2 TIP-1 TIP-2 TIP-4 TIP-3 LS-61 Elevation (Invert) FlexTable: Pump Table Pump Definition St. Pete Beach Pump St. Pete Beach Pump St. Pete Beach Pump St. Pete Beach Pump Treasure Island Pumps Treasure Island Pumps Treasure Island Pumps Treasure Island Pumps LS#61 Pump Head (Pump) Hydraulic Grade (Downstream) Flow (Pump) (MGD) Pressure Model-Formatted.stsw 1/15/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD V8i (SELECTseries 5) [ ] Page 1 of 1

17 Label Elevation (Ground) Elevation (Rim) FlexTable: Outfall Table Elevation (Invert) Boundary Condition Type Elevation (User Defined Tailwater) Flow (Total Out) (MGD) NWRF HEADWORKS User Defined Tailwater Pressure Model-Formatted.stsw 1/15/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD

18 Label South Wetwell North Wetwell W-TI Master Elevation (Initial) FlexTable: Wet Well Table Flow (Total Out) (MGD) Pressure Model-Formatted.stsw 1/15/2017 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT USA Bentley SewerCAD