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Guide to Architects concerning Drainage Water Supply and ...
www.publicworks.gov.za(a) all drainage, water supply and storm water drainage on the plan; (b) all sizes, ground and invert levels and gradients of drainage and storm water pipes and (c) all surface drainage on the elevations and duct sections. 1.2.5 The relevant Local Authority should be consulted and the satisfaction of the project obtained,
Land Drainage Manual - Teagasc
www.teagasc.iedrainage, is the most important figurefor a drainage design as a sub-surface drainage system will siphon off a percentage of this water. The difference between the total rainfall and the sum of evapotranspiration (amount of water that returns to the atmosphere through your grass cover) and overland flowresults in the percolation amount.