Manual 8431 - Visual Resource Contrast Rating
Appendix 3 - A Sample List of Design Techniques for Mitigating Visual Impacts
A. LANDFORM/WATER BODY.
- Reduce Size of Cut and Fill Slopes. Consider:
- relocating to an area with less slope.
- changing road width, grade, etc.
- changing alignment to follow existing grades.
- prohibiting dumping of excess material on downhill slopes.
- Reduce Earthwork Contrasts. Consider:
- rounding and/or warping slopes.
- retaining rocks, trees, drainage, etc.
- toning down freshly broken rock faces with asphalt emulsion spray or with gray point.
- (dding mulch, hydromulch, or topsoil.
- shaping cuts and fills to appear as natural forms.
- cutting rock areas so forms are irregular.
- designing to take advantage of natural screens (i.e., vegetation, land forms).
- grass seeding of cuts and fills.
- Maintain the Integrity of Topographic Units. Consider:
- locating projects away from prominent topographic features.
- designing projects to blend with topographic forms in shape and placement.
B. VEGETATION.
- Retain Existing Vegetation. Consider:
- using retaining walls on fill slopes.
- reducing surface disturbance.
- protecting roots from damage during excavations.
- Enhance Revegetation. Consider:
- mulching cleared areas.
- controlling planting times.
- furrowing slopes.
- planting holes on cut/fill slopes.
- choosing native plant species.
- stockpiling and reusing topsoil.
- fertilizing, mulching, and watering vegetation.
- Minimize Impact on Existing Vegetation. Consider:
- partial cut instead of clear cut.
- using irregular clearing shapes.
- feathering/thinning edges.
- disposing of all slash.
- controlling construction access.
- utilizing existing roads.
- limiting work within construction area.
- selecting type of equipment to be used.
- minimizing clearing size (i.e., strip only where necessary).
- grass seeding of cleared areas.
- Maintain the Integrity of Vegetative Units. Consider:
- utilizing the edge effect for structure placement along natural vegetative breaks.
C. STRUCTURES.
- Minimize the Number of Visible Structures.
- Minimize Structure Contrast. Consider:
- using earth-tone paints and stains.
- using cor-ten steel (self-weathering).
- treating wood for self-weathering.
- using natural stone surfaces.
- burying all or part of the structure.
- selecting paint finishes with low levels of reflectivity (i.e., flat or semi-gloss).
- Redesign Structures that do not Blend/Fit. Consider:
- using rustic designs and native building materials.
- using natural appearing forms to complement landscape character (use special designs only as a last resort).
- relocating structure.
- Minimize Impact of Utility Crossings. Consider:
- making crossings at right angles.
- setting back structures at a maximum distance from the crossing.
- leaving vegetation along the roadside.
- minimizing viewing time.
- utilizing natural screening.
- Recognize the Value and Limitations of Color. Consider:
- that color (hue) is most effective within 1,000 feet. Beyond that point color becomes more difficult to distinguish and tone or value determines visibility and resulting visual contrast.
- that using color has limited effectiveness (in the background distance zone) in reducing visual impacts on structures that are silhouetted against the sky.
- painting structures somewhat darker than the adjacent landscape to compensate for the effects of shade and shadow.
- selecting color to blend with the land and not the sky.
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