Questions about the Unit Hydrograph poster

What’s on the Unit Hydrograph poster?

A definition and 6 facts worth remembering. The runoff hydrograph produced by one unit of effective rainfall falling over a fixed duration. A property of the catchment, not of the storm; Linear: double the rainfall, double the peak; Successive rainfall blocks are superposed; Named by duration: a one hour unit graph; Urbanisation raises the peak and shortens it; Baseflow is separated out before fitting; Area under the graph — One unit of runoff; Time to peak — Falls as land is paved; Two hours of rain are routed by adding two lagged copies of the one hour graph.. Educational reference. Linearity is an approximation that weakens at extremes; flood estimation follows national guidance.

Who is the Unit Hydrograph poster for?

Unit Hydrograph 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 Unit Hydrograph poster?

Routing a design storm through a catchment without a full model. A wall chart earns its place by being glanceable from where the work is happening, so Unit Hydrograph belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.

What other posters go with Unit Hydrograph?

Culvert Design, Continuity & Energy and Groundwater & Wells sit alongside Unit Hydrograph 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 Unit Hydrograph poster free to download and print?

Yes. Unit Hydrograph 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 Unit Hydrograph poster print at?

Unit Hydrograph 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 Unit Hydrograph loses nothing.Printing guide