03696nam a2200421 4500 20260818171625.0 090698 th eng .b10495824 AIT Thesis no. WA-89-16 Pradhan, Niranjan Performance of small automatic irrigation canal structures under laboratory and field conditions Bangkok : Asian Institute of Technology, 1989 110 p. + 1 online resource Thesis ; no. WA-89-16 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1989 The present research emphasizes on the calibration and evaluation of an automatic downstream control AVIO Gate and constant flow distributors. In the laboratory, also the leakage through the emergency gate and the AVIO Gate were studied. The modules were tested both for downstream submerged flow and free flow conditions. From submerged flow data, an attempt was made to develop nomographs which can be used as a tool to determine the flow through the modules for any submergence and upstream and downstream head difference by interpolation. Under downstream submergence, the commencement of orifice flow for Single Baffle Module could not be ascertained due to more effect of submergence. But for the Double Baffle Module except the first falling stage the second falling stage could be ascertained, which shows that the module is more suitable for submerged condition. In case of free flow for both the modules, this falling stage nature is clearly seen within the specified head range above the sill. The coefficients of discharge for weir flow and orifice flow have been determined. From the performance study of the gate separately and associated with modules it is seen that the constant downstream level control gate is really an effective means of making more rational use of available water supplies and of running canal systems on a more economical basis. It also provides an attractive and original answer to the problem of equipping water offtakes and other free surface control works required to maintain a definite downstream water level. The actual flow through the distributors in downstream free flow condition varies from the design flow rates at 5% to 15% and in downstream submerged condition the flow rate variation remains within the range of 20% to 30%. Irrigation Management Irrigation Automation Loof, Rainer, Chairperson Paudyal, Guna N., Co-chairperson Preecha Kamronrithisorn, Examination committee The Government of Japan, Scholarship donor Asian Institute of Technology. Thesis ; no. WA-89-16 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17995 .b10495824 mnait s 240404 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003053666 CREATED : 1994-05-18 RECORD # : i10621921 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003053674 CREATED : 1994-05-18 RECORD # : i10621933 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160034111 CREATED : 2016-12-02 RECORD # : i12881016 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 86877 86877 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-89-16 30050003053666 2026-08-18 17:16:25 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-89-16 30050003053674 2026-08-18 17:16:25 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. WA-89-16 30050160034111 2026-08-18 17:16:25 2026-08-18 40