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