The study revealed that low cost bio-engineering measures using local grass （Saccharum munja）, shrubs （Vitex negundo and Ipomea spp.） and trees （Acacia nilotica and Acacia catechu） along with loose boulder struc...The study revealed that low cost bio-engineering measures using local grass （Saccharum munja）, shrubs （Vitex negundo and Ipomea spp.） and trees （Acacia nilotica and Acacia catechu） along with loose boulder structures （spurs, check dams and gully plugs） of suitable design and dimensions were very effective in channelizing the torrent water flow towards central line and its stabilization. In the catchment, small to medium sized gullies were treated with gully plugging by erecting loose boulder check dams along with suitable vegetative barriers ofSaccharum munja and Ipomea spp. to stop their further advancement. Different treatments of these combinations trapped the sediment to the tune of 5-15 tonnes and it was stabilized at the spur tails. In this, attractive type spur trapped the maximum sediment. The D-50 analysis of sediment deposited was also carried out and the value varied from 3.1-3.7 mm, implying deposition of higher percentage of finer fertile soil proportion and its stabilization. The mechanical as well as vegetative measures helped in the channelization of water course towards the central line to the tune of 10-80 m. The stream banks were stabilized by plantations and put to use under agro forestry systems. Different treatments in catchment, with regard to their efficacy to reduce runoff, ground water recharge, sediment and channel morphology resulted in reclamation of 43 ha area of the torrent bed.展开更多
文摘The study revealed that low cost bio-engineering measures using local grass （Saccharum munja）, shrubs （Vitex negundo and Ipomea spp.） and trees （Acacia nilotica and Acacia catechu） along with loose boulder structures （spurs, check dams and gully plugs） of suitable design and dimensions were very effective in channelizing the torrent water flow towards central line and its stabilization. In the catchment, small to medium sized gullies were treated with gully plugging by erecting loose boulder check dams along with suitable vegetative barriers ofSaccharum munja and Ipomea spp. to stop their further advancement. Different treatments of these combinations trapped the sediment to the tune of 5-15 tonnes and it was stabilized at the spur tails. In this, attractive type spur trapped the maximum sediment. The D-50 analysis of sediment deposited was also carried out and the value varied from 3.1-3.7 mm, implying deposition of higher percentage of finer fertile soil proportion and its stabilization. The mechanical as well as vegetative measures helped in the channelization of water course towards the central line to the tune of 10-80 m. The stream banks were stabilized by plantations and put to use under agro forestry systems. Different treatments in catchment, with regard to their efficacy to reduce runoff, ground water recharge, sediment and channel morphology resulted in reclamation of 43 ha area of the torrent bed.
