Issue link: https://hi.iaq.net/i/248503
www.epa.gov/iaq/moisture Site Drainage Maintenance • Definitions of the maintenance activities necessary to keep each drainage feature operating as intended. Examples include: Issue Failure to maintain drainage systems can lead to unexpected flooding during events of heavy rain or snowmelt, causing extensive property damage. yy Cleaning debris from diversion systems to prevent water flow from being obstructed. yy Removing sediment from the bottom of swales (See Appendix F for sample checklists). Goals • Maintenance agreements and contacts. If contractors are responsible for some or all of the maintenance requirements, list the contractors' names, contact information and responsibilities. Site Drainage Goal 1: Facility maintenance systems and preventive maintenance plans effectively address site drainage. Site Drainage Goal 2: All runoff from parking lots, sidewalks and other impermeable or low-permeability surfaces is diverted to a designed drainage system. Guidance 2: Develop and implement a preventive maintenance plan to maintain parking lots, sidewalks and other impermeable surfaces. Site Drainage Goal 3: Future site development or building modifications or additions do not interfere with existing site drainage systems. • Read, understand and comply with the designer's inspection and maintenance requirements or best management practices for impervious surfaces. Guidance • Develop an inspection checklist and logbook (See Appendix F for sample checklists). Site Drainage Goal 1: Facility maintenance systems and preventive maintenance plans effectively address site drainage. Site Drainage Goal 2: All runoff from parking lots, sidewalks and other impermeable or low-permeability surfaces is diverted to a designed drainage system. Guidance 1: Develop and implement a preventive maintenance plan for landscaping and engineered structures. The purpose of the plan is to ensure that all drainage systems serve the purpose for which they were designed. The plan should include: Guidance 1: Ensure that actions such as plowing snow from sidewalks and parking lots do not obstruct drainage or pile snow against the building. Guidance 2: Inform all lawn-care subcontractors and landscapers about drainage systems on the site so their work does not interfere with the drainage. Have them watch for drainage problems as they work. • An introduction and general information. yy Name and contact information for persons responsible for operation and maintenance. Site Drainage Goal 3: Future site development or building modifications or additions do not interfere with existing site drainage systems. yy A narrative overview describing the site and the theory of operation of the drainage systems. • A definition of the inspection requirements for each drainage feature. Guidance 1: Make sure changes such as additional parking areas (even dirt parking areas) do not overburden existing system capacity or redirect runoff into buildings. Even small projects such as adding planters or walkways can affect infiltration capacity and redirect runoff. yy Inspection frequency should be specified (See Appendix C). yy What to look for. 90