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// CODE SNIPPET

L 411.9 Sloped Areas

2021 Oregon Plumbing Specialty Code > L Sustainable Practices > L 411.0 Landscape Irrigation Systems > L 411.9 Sloped Areas
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Where soil surface rises more than 1 foot (305 mm) per 4 feet (1219 mm) of length, the irrigation zone system average precipitation rate shall not exceed 0.75 inches (19.1 mm) per hour as verified through either of the following methods:
  1. Manufacturer documentation that the precipitation rate for the installed sprinkler head does not exceed 0.75 inches (19.1 mm) per hour where the sprinkler heads are installed not closer than the specified radius and where the water pressure of the irrigation system is not more than the manufacturer's recommendations.
  2. Catch can test in accordance with the requirements of the Authority Having Jurisdiction and where emitted water volume is measured with a minimum of six catchment containers at random places within the irrigation zone for a minimum of 15 minutes to determine the average precipitation rate, expressed as inches per hour (mm/h).

Related Code Sections


L 411.9 Sustainable Practices, Sloped Areas
Where soil surface rises more than 1 foot (305 mm) per 4 feet (1219 mm) of length, the irrigation zone system average precipitation rate shall ...
2021 Oregon Plumbing Specialty Code > L Sustainable Practices > L 411.0 Landscape Irrigation Systems > L 411.9 Sloped Areas
R308.6.6 Building Planning, Glass in Greenhouses
Any glazing material is permitted to be installed without screening in the sloped areas of greenhouses, provided that the greenhouse height ...
2021 Oregon Residential Specialty Code (ORSC) > 3 Building Planning > R308 Glazing > R308.6 Skylights and Sloped Glazing > R308.6.6 Glass in Greenhouses
23.4.4.6.2* Plans and Calculations,
The density shall be calculated on the basis of floor area of sprinkler operation. Where sprinklers are installed under a sloped ceiling, the area ...
Standard for the Installation of Sprinkler Systems 2016 of Portland > 23 Plans and Calculations > 23.4 Hydraulic Calculation Procedures > 23.4.4* Calculation Procedure > 23.4.4.6 Design Densities > 23.4.4.6.2*
8.4.8.1* Installation Requirements,
of the sprinkler Performance under horizontal or sloped ceilings Area of design Allowable clearance to ceilings ...
Standard for the Installation of Sprinkler Systems 2016 of Portland > 8 Installation Requirements > 8.4* Application of Sprinkler Types > 8.4.8 Special Sprinklers > 8.4.8.1*
1101.10 Storm Drainage, Filling Stations and Motor Vehicle Washing Establishments
Public filling stations and motor vehicle washing establishments shall have the paved area sloped toward sumps or gratings within the property lines ...
2021 Oregon Plumbing Specialty Code > 11 Storm Drainage > 1101.0 General > 1101.10 Filling Stations and Motor Vehicle Washing Establishments
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