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Gravel Walks

walk, surface, inches and gutter

GRAVEL WALKS. Gravel is employed for walks chiefly in parks because its natural color usually harmonizes well with that of grass and the foliage of trees and shrubs, and also because a gravel walk is not as hard and stiff in appearance as one of asphalt or cement. When there is a large amount of travel, or where the gravel walks are not well constructed or properly maintained, it may be desirable to construct asphalt or cement walks to prevent disfiguring foot-paths in the turf at the edge of the walk and to obviate the use of unsightly wire or chain fences.

To construct a gravel walk on a sandy subsoil, excavate a trench 4 or 5 inches below the lawn surface, and make the subgrade parallel to the surface of the proposed walk; and then lay 3 or 4 inches of crushed stone or bonding gravel, no piece or pebble of which is more than 1 inch in greatest dimension. If gravel is used, it should not have too much clay in it, or the clay will work through the surfacing material and make the walk muddy and sticky, and the gravel should not contain too little binding material, or the walk, particularly at the crown, will be loose and stony, as the larger pebbles of the foundation will work to the surface of the walk owing to the binding material's being washed out. If the subsoil is clay, excavate the trench. say. 8 inches deep. and lay 5 inches of cinders reasonably free from ashes; and then upon this lay 2+ inches of crushed stone or binding gravel. In either case, the

crushed stone or gravel should be rolled with a 5-ton steam roller, substantially as for a gravel road ( 254), or for a broken-stone ( 341-45).

The top of the foundation should be made exactly parallel with the surface of the finished walk.

The wearing surface should consist of from + to I inch of fine torpedo gravel. i e.. sand having grains from to inch in greatest dimension. The surface of the walk should have a crown of. say. 2 or 3 per cent of its width hut if the crown is too great. the torpedo sand wia be washed into the gutter. The edges of the gm-pi sur face should be depressed about 1 inches below the adjoining iawn.

Paved gutters are very undesirable. but where the walk is on a steep grade they are a necessity. A neat and durable gutter may be formed of small cobble stones. If the slope of the adjoining ground is such that the surface water is likely to flow onto the walk, a sod gutter should be formed on the upper side of the walk. This is done by sinking the turf alongside and parallel to the walk, to form a broad shallow depression. This gutter should have no low places which will catch and retain silt. These sod gutters should have frequent inlets into an underground drain.