SEDIMENT DEPOSITION AGAINST COMPOSITE CHECKDAMS IN SUB- WATERSHEDS

Abstract

THE SEDIMENT DEPOSITION AGAINST EARTH- CUM BRICK MASONARY CHECKDAMS OF 1.20 m FALL CONSTRUCTED AS A SOIL CONSERVATION MEASURE WAS STUDIED IN THE FIVE RAVINOUS SUBCATCHMENTS HAVING AN AREA OF 2.10 ha TO 17.66 HA THE RESULTS SHOW THAT THE SUB CATCHEMENT HAVING HIGH UPSTREAM BED SLOPE GIVE HIGH SEDIMENT YIELD, AND THEREFORE , FALL REQUIREMENT OF CHECKDAM WILL BE MORE. THE AVERAGE TRAPPED SEDIMENTATION MEASURED FROM THE SUB CATCHEMENTS HAVING AGRICULTURAL CROP TABLELAND AS WELL AS IN GULLY BED IS 25.51 m3/ha/year. THE FALL REQUIREMENT OF CHECKDAMS ARE ALSO SUGGESTED IN THE PAPER