|Stormwater Drainage and Land Reclamation for Urban Development (HABITAT, 1991, 94 p.)|
|Annex I: STORMWATER DRAINAGE DESIGN PROCEDURES|
|C. DESIGN CRITERIA|
|C.5 Basic design criteria|
Manning's formulae for open channel flow should be used in calculating the capacity of existing and new stormwater drainage channels. The Colebrook-White equations should be used for the calculation of the flow in pipes.