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Guidelines 2005. Prepared by Lanarc Consultants Limited, Kerr Wood Leidal Associates Limited and Goya Ngan</ref>.
Guidelines 2005. Prepared by Lanarc Consultants Limited, Kerr Wood Leidal Associates Limited and Goya Ngan</ref>.
*The gravel beds should have gentle slopes between 0.5 - 1%.
*The gravel beds should have gentle slopes between 0.5 - 1%.
*'''[[Maximum flow rate through perforated pipe]]'''
*'''[[Flow rate through perforated pipe]]'''
==Materials==
==Materials==