Show heavy rains on an e 0 drains charles cr efflow culott ti la in engineering for land drainage kays ada during rang the construction of a drainage system work is of ton hindered in the spring of tho the year by heavy rains which chib h fill to a greater or less dess extent the trenches which have been dug du and submerge suba erge theoines elines th the lines of tile which have been laid in the case of mains with light fall there is considerable risk from dirt and silt which maybo may bo washed into the drain and partially obstruct it the tilo tile drain may bi be securely closed at the upper end but it 1 the water is permitted to Uw over the top of the tile the drain itself being nearly empty tho the weight odthe 0 the water passing down through the joints until the drain IB full carries with it a large quantity of earth which by reason of the lack lach of current may not pus pass on through the drain the better way is to permit the water to enter direct through the ond and of tho the drain and fill the tile completely ely letting the surplus pass on over the top of the drain |