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Show ATTENTION TO SIDE DITCHES ' I Provision Should Be Made to Remove All Surface Water Rapidly Guard Against Erosion. Special attention should be pnld to providing side ditches which will re- j move all surface water rapidly. Side, ditches on long, steep grades should ' be protected ngnlnst serious erosion by riprap, transverse timbers or other j beams. Culverts and bridges should j be of ample size and be built as per-! manent structures. Drain tile should j be laid to carry oft underground wa- j ter. Side ditches which are kept clean! and have siidiclent slope to lend the water away are usually preferable to! tile drainage, but the latter Is neces- j sary in some places. ' |