4 ROAD IB 6 9 BUILDING E CULVERT plan outlined to do away with construction st of forms remedy for undermining instead of going to the trouble and expense 0 of f making forms for or the concrete culverts cu lverts if the ditch Is 13 tem temp poran orar lly fly tilled with earth an and of t a raped these thes 0 may be made with no forms at all one such culvert was made several years ago that has withstood time and frequent q tit use and Is still without vit hout any arp cue cracks i s the illustration shows how this type of culvert or bridge la is constructed writes date dale ft R van norn in Blisso missouri url and kansas farmer it if a p piece alece of indol la is to be drained this may in ay be how culvert Is constructed built first and the ditch dug afterward if an old ditch Is to be bridged the fill may be made jor for the time being and later removed the concrete Is mixed in the right proportions and laid on the rounding surface to the proper thickness and with suitable re enforcing trenches should be dug at either side to make a good footing to hold tile the culvert rigid and to take the weight of loads passing over it many concrete bridges fall to stand the test of high waters it the foot ing ine is too shallow they undermine 11 72 remedy for undermining during a flood and either crumble or are made unsafe A simple remedy for or this la is to provide a shallow w wall running across the upstream side of 0 the ope opening and a part of the bridge this should extend to the bottom of the side walls and should not be over five or six inches above the low water level this checks any tendency toward undermining and prevents debris from wedging in the bridge