AltPipe

Alt Pipe Worksheet

Project Information

Project EA:

Description:

Location:

Project Engineer:

This pipe alters or extends an existing drainage system. Yes

CONSIDER MATCHING EXISTING PIPE MATERIAL OR REFER TO HDM CHAPTER 850 FOR ALTERNATIVE PIPE MATERIAL CONSIDERATIONS

Is the proposed drainage system designed to operate under hydrostatic pressure, and/or does it require watertight joints Yes

REFER TO HDM INDEX 854.1(2) AND TABLE 854.1 FOR JOINT LEAKAGE SELECTION AND WATERTIGHTNESS CRITERIA

Has a groundwater elevation above the springline been identified in the Geotechnical Design Report? Yes

REFER TO HDM INDEX 856.4 FOR PLASTIC PIPE RESTRICTION

Structural Requirements Due To Overfill

Drainage System Number/Unit:

Pipe Diameter (in)

Maximum Expected Height of Cover over Pipe (ft)

Corrosion And Abrasion Conditions

Design Service Life

Corrosion sampling should include both soil and water (if water is present). Input worse case values.

pH: Input lowest value of pH observed for soil or water.

Minimum Resistivity (ohm-cm): Input minimum resistivity of soil or resistivity of water (whichever is lowest).

Sulfate Concentration (ppm):

Chloride Concentration (ppm): Input the values for chloride and sulfate of the highest value of either the soil or water (if water was tested).

Default to 25,000 ppm is prompted by idealized conditions for prolonged exposure to chlorides and dissolved oxygen levels that concentrate salts on the pipe walls

Abrasion Level

2-5-year Storm Flow Velocity(ft/sec)