Storm Hydrographs Aim: To recognise the recordings of a storm hydrograph and to understand its main features and how it can be influenced by h/p characteristics Case Study: Pakistan 2010

A Storm Hyrdograph

What do we mean by lag time, peak flow and recession/falling limb.

Pakistan Floods 2010 Watch first 3 mins

Pakistan 2010 Floods

11th August 2009

11th August 2010

The Key Controls in a DB System 1.Basin size, shape and relief 2.Types of precipitation 3.Temperature 4.Land use 5.Geology 6.Soil Type 7.Drainage Density 8.Tides and storm surges

Key idea to remember The eight controls set out on the previous slide should not be viewed in isolation to one another. It is rare that just one of these control mechanisms would contribute towards a major event in a drainage basin. They should therefore be viewed as an interacting set of factors that contribute towards the behaviour of the basin.

Task Use page of Waugh – Integrated Approach to make notes on the 8 key DB factors. Where possible, try to find an example (photo, graph or quote) to further illustrate the point.