IELTSWritingTask1:'flooddiagram'answer

Thediagramsbelowshowhowhousescanbeprotectedinareaswhicharepronetoflooding.

Here'smyfullband9report:

Thediagramsparetwodifferentmethodsofdefenceforhomeswhichareatriskofbeingflooded.

Thekeydifferencebetweenthediagramsisthattheyshowfloodprotectionwithandwithoutastopbank.Ineithercase,theat-riskhomeisraisedonstiltsabovegroundlevel.

Thefirstdiagramshowshowastopbankactsasafloodbarriertostopriverwaterfromfloodinghomes.Thestopbankisasmallmoundoflandnexttotheriverthatishigherthanthe100-yearfloodlevel,andpreventstheriverfromburstingitsbanks.Nearbyhousescanbebuiltonstiltstopreventfloodingfromrainwater,andafloodgatebeneaththestopbankcanbeopenedtoallowthis‘ponding’todrainoffintotheriver.

Whenthereisnostopbank,asshownintheseconddiagram,therewillbenothingtostoptheriverfromflooding.Inthiscase,thesolutionistoputbuildingsonstilts.Theheightofthestiltsismeasuredsothatthefloorofthehouseis300mmabovethe100-yearfloodlevel.Thismeasurementiscalledthe‘freeboard’.

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