recurrence interval A~ is the catchment area (ha) Other hydrological models in use are shown in the table below: TABLE 1. Hydrological models for urban drainage design and analysis. Model Model type Appropriate Degree of Major Examples of uses complexity variations models Empirical Peak flow Estimation Very for roof equations of design simple drainage design, flows for Talbot’s formula. very small catchment in property and road drainage Rational Peak flow Design of Simple to - method small and medium( accumulation medium use of of, flowrates, street computers equivalent drainage optional) impervious systems, and areas, areas large of different property land use drainage types. systems. -treatment of Only partial area applicable to effect limited forms of analysis.
recurrence interval A~ is the catchment area (ha) Other hydrological models in use are shown in the table below: TABLE 1. Hydrological models for urban drainage design and analysis. Model Model type Appropriate uses Degree of complexity Major variations Examples of models Empirical equations Peak flow Estimation of design flows for very small catchment in property and road drainage Very simple for roof drainage design, Talbot’s formula. Rational method Peak flow Design of small and medium street drainage systems, and large property drainage systems. Only applicable to limited forms of analysis. Simple to medium( use of computers optional) of, flowrates, equivalent impervious areas, areas of different land use types. -treatment of partial area effect - accumulation
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