D. GRADING DESIGN CRITERIA

Grading shall conform to Chapter 70 of the City of Palmdale Building Code and the following criteria. In case of a discrepancy, the following criteria shall govern.

  • Drainage
  • Minimum Gradients for residential sites:
  • Dirt, grass, etc. 1.0%
  • Fine graded residential lot - dirt 2.0% sheet flow away from building pad for minimum of 3', pad shall be at least 0.3' above high point of swale.
  • Minimum gradients for flat land industrial sites:
  • Earth at rough grade stage 0.5%
  • Earth fine grade 1.0%
  • Asphalt Pavement (sheet flow) 1.0%
  • Concrete Pavement (sheet flow) 1.0%
  • Concrete drain in earth area 0.5%
  • Concrete gutter in paved area 0.4%
  • Maximum gradient for sheet flow 20.0%
  • Design for water to flow to nearest practical street, storm drain or natural watercourse. Cross lot drainage is to be avoided.
  • Show design and location of all drainage devices.
  • Drainage shall not sheet flow over the top of any slopes steeper than 5:1.
  • For residential lots, swales shall be 3 feet minimum from building pad.
  • Common side yard swales are not acceptable.

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