Agriculture Reference
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Van der Molen WH, Wesseling J (1991) Solution in closed form and a series solution to replace the
tables for the thickness of the equivalent layer in Hooghoudt's spacing formula. Agric Water
Manage 19(1):1-16
Vlotman WF, Bhutta MN, Ali SR, Bhatti AK (1994) Design, monitoring and research fourth
drainage project, Faisalabad, 1976-1994. (Draft Main Report). IWASRI Publication No 159.
International Waterlogging and Salinity Research Institute, Lahore, Pakistan, p 90
Vlotman WF, Shafiq-ur-Rehman Y, Bhutta MN (1995) Gravel envelope test results and IWASRI
design guidelines. IWASRI Publication No. 144. International Waterlogging and Salinity
Institute, Lahore, Pakistan, p 49
Vlotman WF, Willardson LS, Dierickx W (2000) Envelope design for subsurface drains.
Publication No. 57. ILRI, Wageningen, The Netherlands, p 358
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