City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 The Engineer shall include a completed Storm Drain Calculations Spreadsheet (see Figure 3) in the construction plans. A description of the runoff calculations is provided below followed by a description of the hydraulic design calculations: • Column 1: Enter the downstream storm drain station number. • Column 2: Enter the upstream storm drain station number. This is the design point. Design should start at the farthest upstream point. • Column 3: Enter the distance (in feet) between the storm drain stations. • Column 4: Enter the designation of the drainage area(s) at the design point in Column 2 corresponding to the designations shown on the drainage area map. • Column 5: Enter the area in acres for the drainage area identified in Column 4. • Column 6: Enter the total drainage area in acres within the system corresponding to storm drain station shown in Column 2. • Column 7: Enter the runoff coefficient “C” for the drainage area shown in Column 5. • Column 8: Multiply Column 5 by Column 7 for each area. • Column 9: Determine the total “CA” for the drainage system corresponding to the inlet or manhole shown in Column 2. • Column 10: Determine inlet time of concentration. • Column 11: Determine flow time in the storm drain in minutes. The flow time is equal to the distance in Column 3 divided by 60 times the velocity of flow through the storm drain in ft/sec. • Column 12: Total time of concentration in minutes. Column 10 plus Column 11. Note that time of concentration only changes at a downstream junction with another drainage area(s). It remains the same from an inlet or junction to the next inlet or junction picking up additional drainage areas. The junction of two paired inlets with each other is not a downstream junction. • Column 13: The intensity of rainfall in inches per hour for the 100-year storm frequency. • Column 14: The 100-year storm runoff in cfs. Column 9 times Column 13. • Column 15: The proposed inlet carryover from upstream inlets during a 100-year storm. This should generally correspond to the carryover flow in Column 10 of the Inlet Spreadsheet (minor variances may occur due to travel time routing in the Hydraulics Table). • Column 16: The proposed inlet carryover during a 100-year storm. This should generally correspond to the carryover flow “q” in Column 38 of the Inlet Spreadsheet (minor variances may occur due to travel time routing in the Hydraulics Table). • Column 17: Design Discharge for the storm drain system (“Qpipe”) in cfs Section 4 – Drainage Design Requirements May 2012 Page 4-23
Engineering Standards Version 6/19/12 • Column 18: Enter the selected pipe size for circular pipe. • Column 19: Enter the selected width for box pipe. • Column 20: Enter the selected height for box pipe. • Column 21: Enter the appropriate Manning’s roughness coefficient “n” (0.013 for concrete pipe and box culverts). • Column 22: Enter the slope of the frictional gradient (hydraulic gradient) determined by Manning’s equation. In a partial flow condition, the friction slope is the slope of the water surface and should follow the slope of the pipe. • Column 23: This is the upstream HGL before the structure and is calculated as Column 24 plus the friction loss (Column 3 times Column 22). • Column 24: This is the beginning hydraulic gradient of the line. It is equal to the Design HGL (Column 32) for the next downstream segment, or the beginning HGL of the system as described above. • Column 25: Velocity of flow in incoming pipe at the junction, inlet or manhole at the design point identified in Column 2. • Column 26: Velocity of flow in outgoing pipe (i.e. the pipe segment being analyzed) at junction, inlet or manhole at design point identified in Column 2. • Column 27: Velocity head of the velocity in Column 25. • Column 28: Velocity head of the velocity in Column 26. • Column 29: Head loss coefficient “Kj”, at junction, inlet or manhole at design point from Table 4.5. • Column 30: Multiply Column 27 by Column 29. • Column 31: Head Loss at Structure. At a junction or change in pipe size, this is Column 28 minus Column 30. At a bend or inlet, this is Column 26 times Column 29. In all cases this is 0.10’ minimum. • Column 32: Design HGL at the design point identified in Column 2. Column 24 plus Column 31. This is the beginning HGL (Column 24) for any upstream pipe discharging into that junction. • Column 33: Invert elevation for the pipe being analyzed at the downstream storm drain station in Column 1. • Column 34: Invert elevation for the pipe being analyzed at the design point (upstream storm drain station) in Column 2. • Column 35: Top of curb elevation at the design point in Column 2. • Column 36: Comments regarding pipe being analyzed. Section 4 – Drainage Design Requirements May 2012 Page 4-24
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Version 6/19/12 2.03 PIPE FITTINGS:
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City of Frisco Engineering Standards

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