2. System Plan

Preliminary or working drawings featuring the basic components of the intended design are invaluable in the development of a system plan. After design completion, the drawings facilitate documentation of the overall plan.
The following items should be included in the working drawings:
  • a general layout
  • basic hydrologic data
  • pertinent physical features
  • characteristics of flow diversion (if applicable)
  • detention features (if applicable)
  • outfall location and characteristics
  • surface features (topography)
  • utilities
  • tentative component placement.
The final drainage design drawings should include the existing physical features of the project area and indicate the location and type of the following:
  • streets
  • driveways
  • sidewalks and ADA ramps
  • parking lots
  • bridges
  • adjacent areas indicating land use, such as undeveloped land, commercial land, industrial land, agricultural land, residential land, and park land
  • detention facilities
  • pump stations
  • drainage channels
  • drainage diversions
  • off-site watershed boundaries.