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f HIGHWAY DESIGN MANUAL 900-5 ` May 18, 1992 Irrigation systems should be designed for statewide basis, design standards lower than automatic operation. When systems are tempo- indicated herein may not be used without ap- rary or will be used infrequently, manual, bat- proval from the Office of Landscape Architec- tery, meter, or tuner-operated valves may be ture. used. Where practical, trees and shrubs should be 903.2 General Notes individually watered by bubblers or emitters. Safety roadside rest areas are to be con- Sprinklers should be appropriate for local wind structed on State highway right of way, and all and soil conditions. Sprinklers adjacent to the the area involved are to be considered as part of roadway should be selected and placed to avoid the State highway right of way. Ingress and spray on the roadway. Water quality should be egress facilities to rest areas should be designed considered when selecting components and de- to the standards of the highway along which signing the system. they are located as indicated in Index 107.1. Components, such as pipe valves, bubblers, Safety roadside rest areas should be de- and emitters, should be positioned where they signed with function and aesthetics equally will not be damaged by normal plant growth. considered with economy and ease of mainte- Potential damage from pedestrians or vehicles nance. Structures and facilities should com- should be considered when selecting and lo- bine aesthetic principles with functional re- cating sprinklers. quirements both as individual units and as re- Security measures, such as locking cabinets lated elements in the overall site plan. A unity or fenced enclosures, should be provided when of design should be expressed in all elements of components must be placed near pedestrian ar- each facility regarding materials, texture, color, eas. form, and. scale. The site plan is the responsi- Assemblies for irrigation components should bility of the Landscape Architect.' - be designed so they can be serviced easily. The design of architectural structures such Controllers for overhead systems should be as comfort stations, map display panels, picnic easily accessible and located away from the tables, picnic table shelters, utility structures, spray of sprinklers at a spot where planted ar- etc., will be done by the Division of Structures. eas can be seen. The architect in DOS is responsible for the de- Reduced pressure-type backflow preventers velopment of all architectural relationships within the facility, including color and materials must be used to-isolate irrigation systems from coordination. potable public water supplies. Pressure vac- uum breakers and nonpressure atmospheric Topographic features should be preserved vacuum breakers are permissible in appropriate and existing trees and other natural growth situations. Double-check valve type backflow should be utilized wherever possible. Views preventers must not be used. Master remote should be considered in the development of the control valves and wye strainers should be used site. Provisions for expansion of the various fa- at all pressured water sources directly adjacent cilities and circulation patterns should be Ion- to backflow preventers. sidered on all projects. Safety roadside rest areas shall be designed to be accessible to all Topic 903 Safety Roadside Rest travelers. Area Design Standards 903.3 Function 903.1 Minimum Standards The intent of the Safety Roadside Rest Area The following standards generally represent System is to furnish places where motorists may stop for short periods to rest and relax minimum values. However, design policies and from the tensions of driving. To fulfill the intent standards are not inflexible. When in line with of this program, the facilities must be accessi- I sound judgment, systems considerations and ble, neat, orderly, complete, and attractive. The other valid concerns, variations may be consid- objective is to provide facilities which promote ered. To promote uniform practice on a