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J HIGHWAY DESIGN MANUAL 900-1 July 1, 1990 Topic 902 - Planting Design Standards CHAPTER 900 LANDSCAPE ARCHITECTURE 902.1 General Notes Topic 901 - General This section provides minimum standards and general guidelines for the design of planting and irrigation systems. When justified by spe- Indez 901.1 - Office of Landscape cial circumstances, deviations may be permit- Architecture ted. The Office of Landscape Architecture is re- Technical details of planting and irrigation sponsible for the development of departmental design are not discussed in this section. Com- policies, programs, procedures, and standards mercially available publications should be con- for all aspects of landscape architecture, in- sulted concerning these aspects. eluding.highway planting, revegetation, vegeta- t (1) Design Factors. Planting and irrigation ive erosion control, roadside management, systems should be designed to achieve a bal- safety roadside rest areas and vista points. ance between safety, maintainability, cost-effec- tiveness, resource conservation, and aesthetics. 901.2 Cross References Careful selection of plant materials and irri- Several landscape architectural terms are gation components, proper placement of plants, defined in Index 62.5. and careful development of irrigation strategies Policy and Procedure Memorandum, P82-9 are essential. (Revised), contains general policies and pro- (2) Safety. Planting and irrigation facilities cedures concerning planting and conservation should be designed to ensure the safety of both of vegetation. Section 2-3.3, "Scenic Resource maintenance personnel and the public. Determination", of the Environmental Hand- To understand potential hazards to main- book explains procedures and responsibilities tenance personnel, designers should be familiar for evaluating and dealing with existing vegeta- with Chapter 8, 'Protection of Workers", of the tion in the environmental process. Maintenance Manual. Access gates, paths for The Project Development Procedures Man- maintenance operations, and turnouts should ual explains procedures and responsibilities for be provided as necessary to allow safe access to developing planting projects. and from work areas (see Policy and Procedure The Encroachment Permits Manual explains Memorandum P81-11). Design features that procedures and guidelines for administering ultimately will require shoulder or lane closures planting by others, through permits. should be avoided. Sight distance, setbacks, and location of plants and irrigation compo- Section 6-20, "Erosion Control and Highway nents should be carefully considered. Planting Planting", of the Construction Manual discusses should not interfere with the function of safety materials and methods involved in planting and features such as median barriers. irrigation. (3) Maintainability. Maintenance-intensive Chapter 22, "Landscape Maintenance", of activities should be identii3ed and minimized by the Maintenance Manual discusses mainte- design.. These activities can be determined nance of roadside vegetation including a brief through field observation and discussions with description of roadside plants and a glossary of maintenance personnel during project develop- planting terms. ment. Ongoing communication between de- signers, construction inspectors, and mainte- nance personnel is encouraged to ensure that maintenance concerns are addressed. To encourage quality construction, speciflcations should clearly define materials,