Appendix H: Sewer Capacity Study

Transcription

1 Appendix H: Sewer Capacity Study

2 SoCal Civil Solutions Inc. September 28, 2017 Mr. Taylor Abernathy, PE, CFM City of Orange Public Works - Subdivision Department 300 E. Chapman Avenue Orange, CA RE: Proposed Sewer Capacity- 702 W. Town and Country Road, Orange Taylor, Per the requirements of the City of Orange Sewer Capacity Policy, dated June 2016, we have analyzed the designed and existing sewer capacity data provided on the attached sewer capacity map. Using the existing capacity numbers from that map and by acquiring the Orange County Sanitation District Engineering Design Criteria for average daily flow by land use per acre, we were able to calculate the proposed flow depth of the existing 12" diameter sewer main that we expect to tie into. By calculating the average daily flows for 8.46 acres for high density residential and 3.57 acres for medium density residential of our site and combining the existing flows provided to us, we only increased the depth within the existing 12" diameter pipe by approximately 1.25 ". As you can see from the attached calculations worksheets and pipe cross sections, we are still well below the 50% outlined in the City of Orange Sewer Capacity Policy, therefore we are not deficient. From the City's Capacity Policy, we are well within the pipe capacity threshold. Therefore, no additional downstream studies are required. Please feel free to contact me with additional questions. Thank you. Sincerely, John Deykes Principal

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4 Existing Worksheet for Circular Pipe -1 Project Description Friction Method Solve For Manning Formula Input Data Roughness Coefricient Channel Slope ft/ft Diameter 1.00 ft Discharge Q:0161 fp/s Results ft Flow Area 0.02 fp Wetted Perimeter 0,50 ft Top Width 0.48 ft Critical Depth 0.05 ft Percent Full 6.0 % Critical Slope ft/ft Velocity 0.83 ft/s Velocity Head 0.01 ft Specific Energy 0.07 ft Froude Number 0.73 Maximum Discharge 2.44 ft^/s Discharge Full 2.26 ft^/s Slope Full ft/ft Flow Type SubCritical GVF Input Data Downstream Depth ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth ft Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % Over Rise 6.03 % Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Bentley Systems, Inc. Haestad Mettiods Solution Center Bentley FlowMaster [ ] 9/28/2017 1:03:39 PM 27 Siemons Company Drive Suite 200 W Watertown, CT USA Page 1 of 2

5 Existing Worksheet for Circuiar Pipe -1 GVF Output Data Critical Depth Channel Slope Critical Slope ft 0.05 ft ft/ft ft/ft BenQey Systems, Inc. Haestact Methods Solution Center Bentley FlowMaster [ ] 9/28/2017 1:03:39 PM 27 Siemons Company Drive Suite 200 W Watertown, CT USA Page 2 of 2

6 Existing Cross Section for Circular Pipe - 1 Project Description Friction Method Solve For Manning Formula Input Data Roughness CoeffEcient Channel Slope ft/t ft Diameter 1.00 ft Discharge Cross Section Image Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [0S ] 9/28/2017 1:02:37 PM 27 Siemons Company Drive Suite 200 W Watertovm, CT USA Page 1 of 1

7 Proposed Worksheet for Circular Pipe -1 Project Description Friction Method Solve For Manning Formula Roughness Coefficient Channel Slope ft/ft Diameter 1.00 ft Discharge ft^/s Results ft Flow/ Area 0.08 fl? Wetted Perimeter 0.84 ft Top Width 0.74 ft Critical Depth 0.15 ft Percent Full 16.5 % Critical Slope ft/ft Velocity 1.58 ft/s Velocity Head 0.04 ft Specific Energy 0.20 ft Froude Number 0.82 Maximum Discharge 2.44 ft^/s Discharge Full 2.26 Slope Full ft/ft Flow Type SubCritical GVF Input Data Downstream Depth ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth ft Profile Description Prolile Headloss 0.00 ft Average End Dep^ Over Rise 0.00 % Over Rise % Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s 9/28/2017 1:06:06 PM Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [ ] 27 Siemons Company Drive Suite 200 W Watertown, CT USA Page 1 of 2

8 Proposed Worksheet for Circular Pipe -1 GVF Output Data Critical Depth Channel Slope Critical Slope ft 0.15 ft ft/ft ft/ft Bentley Systems, Inc. Haestad Mettiods Solution Center Bentley FlowMaster [ ] 9/28/2017 1:06:06 PM 27 Siemons Company Drive Suite 200 W Watertown, CT USA Page 2 of 2

9 Proposed Cross Section for Circular Pipe -1 Project Description Friction Method Solve For Manning Formula Input Data Roughness Coefficient Channel Slope Diameter Discharge ft/ft ft 1.00 ft ft?/s Cross Section Image l.ixft V 1 I\ M 1 9/28/20171:06:28 PM Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [ ] 27 Siemons Company Drive Suite 200 W Watertown, CT USA Page 1 of 1