Guidelines and computer programs for the planning and design of land drainage systems

FAO IRRIGATION AND DRAINAGE PAPER - 62


GUIDELINES AND COMPUTER PROGRAMS
FOR THE PLANNING AND DESIGN
OF LAND DRAINAGE SYSTEMS

W.H. van der Molen
Wageningen University Wageningen, Netherlands

J. Martínez Beltrán, FAO Land and Water Division

W.J. Ochs, Water Management Engineers Annandale, USA

Full pdf - 2,4 Mb


    FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 2007


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Table of contents

Part I  - 773kb

Foreword
Acknowledgements
List of acronyms
List of symbols
1. Introduction

Part II  - 497kb

2. Environmental considerations in drainage projects
3. Socio-economic and institutional aspects
4. Drainage studies and investigations
5. Main drainage and disposal systems

Part III  - 610kb

6. Surface drainage
7. Subsurface drainage
8. Calculation programs for drainage design
References
Annexes

    1. Estimating soil hydrological characteristics from soil texture and structure
    2. Statistical analysis of extremes
    3. Field methods for measuring hydraulic conductivity
    4. Determining drainable soil porosity
    5. Determining other soil hydrological characteristics
    6. Estimating recharge due to irrigation
    7. Leaching for salinity control
    8. Procedures for determining soil hydrological characteristics in drained lands
    9. Procedure for deriving drainage design criteria from drained lands

Part IV  - 951kb

Annexes

    10. Calculations regarding elements of the main drainage system
    11. Example of the batch method for flat lands
    12. Cypress Creek formula
    13. Statistical analysis of measured flows
    14. Unit hydrograph
    15. Rational formula
    16. Curve number method
    17. Formulae for steady-state flow to drains
    18. Drainage under vertical seepage
    19. Formulae for non-steady-state flow to drains
    20. Diameters of drainpipes
    21. Interceptor drains
    22. Drainage by vertical wells
    23. Computer programs for drainage calculations

© FAO 2007