University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 51 1 2020 03 20 Effect of Micro-dams on Infiltration and Uniformity of Water Distribution Along the Furrow Effect of Micro-dams on Infiltration and Uniformity of Water Distribution Along the Furrow 13 23 72337 10.22059/ijswr.2019.281333.668203 FA Mohammad Sadegh Keshavarz Graduate student, Dept. of Irrigation & Reclamation Eng. College of Agriculture and Natural Resources University of Tehran Hamed Ebrahimian Associate professor in Irrigation & Drainage Eng., University of Tehran Center for International Scientific Studies & Collaboration (CISSC), Ministry of Science, Research and Technology Fariborz Abbasi Agricultural Engineering Research Institute (AERI), Agricultural Research, Education and Extension Organization, Karaj, Iran 0000-0002-0662-7723 Journal Article 2019 05 22 There is a large amount of runoff water losses from the fields in the open-ended furrows. Therefore, it is necessary to provide a suitable solution for reducing runoff losses and subsequently, reducing soil erosion from the furrows. In this study, in order to control flow velocity as well as increase water infiltration along the furrows, several micro-dams with a height of 5 cm were constructed in the experimental furrows. Field studies and experiments were conducted at the research farm of the College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran, in summer 2018. The soil texture was clay loam, and the longitudinal farm’s slope was 0.96%. In this study, four different treatments were considered, which included: two erosive inflow discharges (0.6 and 0.9 L/s) and two barrier distances (10 and 20 m). Experimental furrows with a length of 100 m and a spacing of 0.75 m were created by the furrower machine. Eventually, the results were compared with control ones (furrow without micro-dams). Constructing micro-dams in the furrows increased distribution uniformity up to 99.3 percent. The results showed that micro-dams could improve the distribution uniformity of water and reduce water losses to about 45 percent. The results also depicted that the amount of infiltrated water in the first and second irrigation events was significantly higher than the third and fourth ones. The reason was because of lower soil moisture content and also higher surface roughness in the first and second irrigation events compared to subsequent irrigations. Among all irrigation events, the most amount of infiltration was observed in the treatment with a barrier of 10 m and an inflow discharge of 0.9 L/s. There is a large amount of runoff water losses from the fields in the open-ended furrows. Therefore, it is necessary to provide a suitable solution for reducing runoff losses and subsequently, reducing soil erosion from the furrows. In this study, in order to control flow velocity as well as increase water infiltration along the furrows, several micro-dams with a height of 5 cm were constructed in the experimental furrows. Field studies and experiments were conducted at the research farm of the College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran, in summer 2018. The soil texture was clay loam, and the longitudinal farm’s slope was 0.96%. In this study, four different treatments were considered, which included: two erosive inflow discharges (0.6 and 0.9 L/s) and two barrier distances (10 and 20 m). Experimental furrows with a length of 100 m and a spacing of 0.75 m were created by the furrower machine. Eventually, the results were compared with control ones (furrow without micro-dams). Constructing micro-dams in the furrows increased distribution uniformity up to 99.3 percent. The results showed that micro-dams could improve the distribution uniformity of water and reduce water losses to about 45 percent. The results also depicted that the amount of infiltrated water in the first and second irrigation events was significantly higher than the third and fourth ones. The reason was because of lower soil moisture content and also higher surface roughness in the first and second irrigation events compared to subsequent irrigations. Among all irrigation events, the most amount of infiltration was observed in the treatment with a barrier of 10 m and an inflow discharge of 0.9 L/s. https://ijswr.ut.ac.ir/article_72337_96f585dbc7916491755a23e1e37c3e84.pdf