| Show PROPER BUILDING j I 1 OF CHECK DAMS i WHERE NEEDED 1 to get the best results from check dams in gullies tops of 0 dams should be low enough in the middle and high i 4 enough at the ends to carry the run I 1 off water after heavy rains without overflowing gully banks or washing washl f soil around ends ot of dams dama say I 1 en ginders of the united st states ates depart went ot of agriculture S if dams are arc too high the carrying I 1 capacities of gullies les are reduced and ana water overflows their banks banka sah and washes around the ends of the daro dann and can form new gullies down the slopes parallel to the old ones oneia where dams are watertight the enda end should extend far enough into th the gully banks to prevent water seeping around the dams and washing the sides of away foundations ot of dams dai al 9 5 should it 0 ild ex ei 1 tend far enough below belo the th w bot lo 10 it toBt M I 1 of the gullies so that hydraulic pros pres f sure will not cot force the water under the dams to undermine and destroys des troyl i them the coors of gullies should be paved at the lower sides of the m darns dams for sufficient clent length and width to prevent any erosion or ing of the dams by water dropping i over the crests dams are built in gullies to cause their filling with sediment cri carried aried ly by water and to clicc check k soil 11 era ro slon when gullies in cultivated fields are filled farmers save much time and labor in cultivating and i harvesting filled filed F gullies laa in pasture lands eliminate danger of accidents to grazing animals temporary dams usually are made macef ot of materials found on farms such al B stakes brush straw logs and loose rock woven wire Is also a so used most temporary dams are porous when first built but the spaces gradually gradual lil fill with trash and soil brought down by the water permanent dams are built ot of earth masonry and concrete 11 ll the bureau of agricultural en engl g at washington can supply sti suggestions for constructing dams dains in gullies |
