On-Farm Development Works
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REVISED DRAFT MANUAL OF ON-FARM DEVELOPMENT WORKS GOVERNMENT OF MAHARASHTRA IRRIGATION DEPARTMENT REVISED DRAFT MANUAL OF ON-FARM DEVELOPMENT WORKS GOVERNMENT OF MAHARASHTRA IRRIGATION DEPARTMENT MUMBAI JUNE 2002 FOREWORD • PREFACE • 1.0 The Manual of design for On-farm Development (O.F.D.) Works was published in 1982. In the past two decades, this Manual was used extensively by designers and field officers. The designers and the field officers have gained large base experience in respect of Micro Distribution Network and land forming as well. The Government has also issued various Circulars about planning and design of O.F.D. Works in last two decades to improvise and economize the implementation of O.F.D. Works. A long-term need was felt to revise the Manual of design for On-farm development works (1982) based on the large scale field experience and to incorporate Government’s instructions contained in various Circulars and make the Manual more comprehensive to encompass various aspects of construction and quality control in addition to planning and design of O.F.D. Works. The Government in irrigation Department has, therefore, constituted a Committee of Members comprising of WALMI Faculty Members, Senior Officers and Engineers with field experience. The Committee is pleased to present this revised and comprehensive Manual. Since, this Manual covers overall activities pertaining to O.F.D. Works in addition to planning and design, the Manual is titled as “The Manual of O.F.D. Works”. 2.0 In the context of improving Irrigation Water Management and to bridge the gap between created Irrigation Potential and its utilization, a well designed and carefully laid Micro Distribution Network plays an important role. Hence, a comprehensive strategy envisaging precision planning, accurate topographical and soil surveys and a high degree of accuracy in construction with appropriate quality control is very much required. The utility of O.F.D. Works would increase if farmers’ participation is initiated since planning, designing and carried forward till construction and maintenance of O.F.D. Works. This Manual has set guidelines for technical and constructional aspects with active participation at appropriate stages. 3.0 In order to imbibe a ground touch of field experience regarding O.F.D. Works, the Committee organized a one-day “Experience sharing” workshop at WALMI. About 75 experienced field officers from Konkan, Marathwada, Vidarbha, West and North Maharashtra Region working in this area and Irrigation management attended this Workshop. The deliberations and suggestions received from the field engineers belonging to various regions have been given due consideration at appropriate places in this Manual. Guidance and discussions with Shri S.V. Sodal, Secretary (CAD) and Shri D.M. More, Chief Engineer (I) and Joint Secretary, Irrigation Department have helped in achieving right orientation in revising the manual. Manual could get the base of research and development through various research reports prepared by D.I.R.D., Pune and Diagnostic Analysis studies done on several projects by WALMI, Aurangabad. 4.0 The Manual of O.F.D. Works has eleven chapters. As compared to the O.F.D. Manual of 1982, the present one incorporates three additional chapters covering following topics. i) Key issues in planning, design, construction and maintenance ii) Flow measuring devices iii) Non-conventional methods of O.F.D. Works in hilly and high rainfall areas (like Konkan and Eastern part of Vidarbha region). The Chapter-3 on “Key issues in planning, design, construction and maintenance of O.F.D. Works” is expected to create awareness regarding importance of O.F.D. Works and make the designer as well as field engineer conscious in different aspects of O.F.D. Works including the legal provisions. The issue of flow measurement for volumetric supply of water to Water Users’ Association has gained an important dimension in the Government policy to handover created irrigation potential to Water Users’ Associations. Hence, a separate Chapter-6 on “Flow Measuring Devices” is added. The Konkan and some part of Vidarbha region have typical topographical, climatic and soil conditions. The conventional O.F.D. Works with network of open channels do not fulfill the requirements of efficient irrigation water management. Hence, Chapter-10 on “Non-conventional Method of O.F.D. Works” is added to the Manual which is informative and deals about the non conventional O.F.D. Works like: a) Piped distribution system b) Taking water through R.C.C. half round pipes supported over concrete pedestals. c) Creating an interface between gravity irrigation network and pressurized irrigation system 4.1 The balance 8 chapters of the Manual describe the general approach to planning and cover detailed designs of O.F.D. Works. They have similar format as used in the Manual of design for On-farm development works (1982), but the details have been updated based on Government Circulars and reviewed at appropriate places to incorporate practical field experience. The Chapter-1 describes the general approach to design and planning of O.F.D. Works with a emphasis on farmers’ participation, organizational coordination, systems approach and levels of accuracies. Methods of Survey, Investigation and Mapping have been dealt in Chapter-2. The principles of chak layout and field channel alignment have been elaborated in Chapter-4. The Chapter-5 on chak water delivery system includes step-by-step procedure for finalizing the bed profile of field channels and ready reckoner for field channel design. This would help even a beginner to design the chak water delivery system. The details of structures in Black Cotton Soil have been specially incorporated. Exhaustive and elaborate information and guidelines on Lining covering selection, design, construction, quality control and economic aspects of F.C. lining is included in Chapter-7. This Manual covers design procedures for land forming / land shaping with standard norms of land slopes pertaining to the type of crops and method of irrigation duly illustrated with case studies in Chapter-8. Guidelines for Surface drains have been set out in Chapter-9. The Chapter-11 on “Record of O.F.D. Works” emphasizes on proper preparation maintenance and handing over of record of O.F.D. Works. This aspect has a special bearing in the changing scenario of irrigation management, with farmers’ participation through formation of Water Users’ Associations. The O.F.D. Manual of 1982 contained a chapter on Water distribution and application (Chapter-4). This has been deleted, as a part of it related to water application methods has been covered in the Chapter-8 of this Manual and the balance part which is related to capacity design of minor/distributory falls outside perview of this Manual. 5.0 Planning and design is a dynamic process. Evolutions in these aspects are necessary to cope up with the changing environment and advancing techniques. Day-by-day, water is becoming more and more precious. Hence, for efficient water management and O.F.D. Works, which form the prime components of distribution network, will have to be designed, planned and constructed with a new set up of mind to keep pace with the changing needs of the time. It may, therefore, be necessary to take up the work of further revision of this Manual in next few years. 6.0 The members of the Committee, Shri A.R. Kore, Shri R.B. Ghote, Shri D.G. Holsambre, Shri V.V. Patki, Shri A.B. Deshpande, Shri S.G. Lavekar and Shri C.B. Kulkarni have made significant contributions in preparing drafts of various chapters and participated in the discussions. The contribution of Shri V.V. Patki, Executive Engineer, Jayakwadi Land Drainage Division, Aurangabad in preparing drafts of three Chapters, modifying and editing other three Chapters, is commendable and praiseworthy. Thanks are due to WALMI, Aurangabad for intellectual support besides providing all the infrastructure facilities to the Committee in preparing this Manual. The Committee is thankful to the Government in Irrigation Department particularly Shri S.V. Sodal, Secretary (CAD) and Shri D.M. More, Chief Engineer (I) and Joint Secretary for continuous guidance and giving an opportunity to contribute, this way, in the development and management of irrigation potential of the State. 7.0 It is hoped that this Manual will be useful to the designer as well as to the field engineers to understand the basics of O.F.D. Works and will help them to implement actual design, and construction. The newly added chapters are expected to enhance the utility of this Manual. Any errors as well as any suggestions to improve any technical matter in the Manual are welcome, which may please be communicated to Government so that these can be incorporated in the next revision. June 30, 2002 (A.R. Suryavanshi) Professor and Head, Science Faculty, WALMI, Aurangabad and Chairman, Committee for Revision of OFD Manual COMMITTEE FOR REVISION OF ON FARM DEVELOPMENT MANUAL 1) Prof. A.R. Suryavanshi Chairman Professor and Head, Science Faculty Water And Land Management Institute, Aurangabad-431005. 2) Shri A.R. Kore Member Superintending Engineer & Administrator Command Area Development Authority Solapur. 3) Shri R.B. Ghote Member Superintending Engineer Nanded Irrigation Circle Sinchan Bhavan, Post Box No. 20 Nanded. 4) Shri D.G. Holsambre Member Professor & Head Engineering Faculty Water And Land Management Institute, Aurangabad-431001. 5) Shri V.V. Patki Member Executive Engineer Jayakwadi Land Drainage Division Aurangabad. 6) Shri C.B. Kulkarni Member Deputy Administrator CADA Garkheda Aurangabad. 7) Shri S.G. Lavekar Member Deputy Executive Engineer C/o Executive Engineer Dudhganga Canal Division No.1 Warna Bhavan Kolhapur. 8) Shri A.B. Deshpande Member Assistant Chief Engineer Secretary C/o Chief Engineer (I) Sinchan Bhavan Aurangabad. CONTENTS CHAPTER PAGE NO.