Consider the use of wrap-around straps in lieu of OPERATION AND MAINTENANCE rigid supports on steep roofs where the outer Develop an operation and maintenance plan that edge of the gutter cannot be placed below the is consistent with the purposes of the practice, projected roof line. site conditions and safety requirements. The On roofs subject to snow and ice slides, plan will contain, but not be limited to, the consider additional supports even if the gutter is following provisions: installed below the projected roof line. Keep roof runoff structures clean and free of For cold climates, ensure the underground outlet obstructions that reduce flow. is deep enough to avoid freezing or include a Make regular inspections and perform method to bypass the outlet without damage to cleaning and maintenance as needed. the downspout. PLANS AND SPECIFICATIONS NRCS, 2009, National Engineering Handbook, Provide plans and specifications for installing a Part 651, Agricultural Waste Management Field roof runoff structure that describe the Handbook, Chapter 10, Agricultural Waste requirements for applying this practice to Management System Component Design achieve its intended purpose. At a minimum, include the location, size and any specific NRCS, National Engineering Handbook, Part installation instructions of all gutters and spacing 650, Engineering Field Handbook, Chapter 2, of downspouts, type of ground gutters, outlets Estimating Runoff and the types and quality of material to be used. NRCS National Engineering Manual, Part Include plans and specifications for other 536.20, Design Criteria for Reinforced Concrete practices essential for the proper functioning of NRCS National Engineering Handbook, Part the roof runoff structure. 642, Construction Specification 32, Structur Instruct landowner and contractor of Concrete responsibility to locate all buried utilities in the project area, including drainage tile and other structural measures.
Consider the use of wrap-around straps in lieu of rigid supports on steep roofs where the outer edge of the gutter cannot be placed below the projected roof line. On roofs subject to snow and ice slides, consider additional supports even if the gutter is installed below the projected roof line. For cold climates, ensure the underground outlet is deep enough to avoid freezing or include a method to bypass the outlet without damage to the downspout. PLANS AND SPECIFICATIONS Provide plans and specifications for installing a roof runoff structure that describe the requirements for applying this practice to achieve its intended purpose. At a minimum, include the location, size and any specific installation instructions of all gutters and spacing of downspouts, type of ground gutters, outlets and the types and quality of material to be used. Include plans and specifications for other practices essential for the proper functioning of the roof runoff structure. Instruct landowner and contractor of responsibility to locate all buried utilities in the project area, including drainage tile and other structural measures. OPERATION AND MAINTENANCE Develop an operation and maintenance plan that is consistent with the purposes of the practice, site conditions and safety requirements. The plan will contain, but not be limited to, the following provisions: Keep roof runoff structures clean and free of obstructions that reduce flow. Make regular inspections and perform cleaning and maintenance as needed. NRCS, 2009, National Engineering Handbook, Part 651, Agricultural Waste Management Field Handbook, Chapter 10, Agricultural Waste Management System Component Design NRCS, National Engineering Handbook, Part 650, Engineering Field Handbook, Chapter 2, Estimating Runoff NRCS National Engineering Manual, Part 536.20, Design Criteria for Reinforced Concrete NRCS National Engineering Handbook, Part 642, Construction Specification 32, Structur Concrete
558_RoofRunoffStructure_STD_DRAFT_30_Day_mam_06172015.docx