Questions about the Return Periods poster

What’s on the Return Periods poster?

A definition and 6 facts worth remembering. An intensity-duration-frequency curve gives rainfall intensity for a chosen duration and return period. Shorter storms are more intense, not wetter; Return period is a probability, not a timetable; A one in 100 event can happen twice running; Its chance in any single year is about 1%; Design duration matches time of concentration; Climate allowances are added to older curves; 1 in 30, any one year — About 3.3%; 1 in 30, over 30 years — About 64%; A one in 30 year sewer still has roughly a 64% chance of surcharging in 30 years.. Educational reference. Design return periods and climate change allowances are set by the regulator and the standard.

Who is the Return Periods poster for?

Return Periods belongs to the Civil Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning water resources can pin it up — a beginner, a student mid-course, or someone revising years later.

When should you use the Return Periods poster?

Choosing a design storm, and explaining the choice to a client. A wall chart earns its place by being glanceable from where the work is happening, so Return Periods belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.

What other posters go with Return Periods?

Culvert Design, Continuity & Energy and Groundwater & Wells sit alongside Return Periods in the Civil Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Culvert DesignContinuity & EnergyGroundwater & Wells

Is the Return Periods poster free to download and print?

Yes. Return Periods downloads as a free PDF with no account, no email and no watermark, like everything else in the Civil Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence

What size does the Return Periods poster print at?

Return Periods is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Return Periods loses nothing.Printing guide