Show 14 vi v VIP SURFACE DRAINAGE OF ROADS crown of a road nond should DC be sufficient ta shed water rapidly recommendation men dation from iowa dy oay mop J r DAVIDSON iowa Agricol agricultural tural Coi coolege lege the roads should bo be provided with drainage the tha cross section should bo be of such buch fa a shape ns as to shui ehe all rain ai nt once to tho the tilde clde to do this tho the road must bo be oval ot 01 havo have a crown must bo be smooth the first of at those la Is a i matter of at cons construction truo and the latter of maintenance tho the side eldo drainage system should be ba called upon to carry as much wate RR as possible water cannot bo be carried away by tho the tile drains until tho the batet has sunk through the sell KOI and soft ened it tho crown of 0 ft a road should be sut out fitment to blied the water readily 11 II tho the road Is to bo be maintained and kepi fro fr o from ruts and holes less crown will do than it if tho the road Is to bo be neg lecter the iowa highway mission recommended a slope one inch ia to ana one foot for a crown in ID the tha trav traveled clea way this la Is sufficient toi for moat goat conditions tho jhb crown should pr ka A i i i well laid drain for hill road not be too greata steep crown causes the travel to bo be concentrated at tho the center where ruta will be worn and washing result again there is somo some difficulty in vehicles cles passing on the tha tide ilde of the crown the wheels of the vehicles have tendency to grind the road down the tops of at the aba wheels are ara bearer the gutter than the bottoms rols action together with the swerving or flow action of the lower part of the he wheel has a very marked et ef act the steeper the slope elope of the road the more important the crown tor for there Is a tendency for the water to run down the track rather than to the side it water once begins to run iown own the center of the broadw roadway a y it is ia but a short time until the road to Is gullied out |