What is wa­ter mains flush­ing and why is it done?

Bush Telegraph - - FOCUS ON FARMING -

Flush­ing of Coun­cil|s wa­ter mains is done to im­prove wa­ter qual­ity, by clear­ing po­ten­tially stag­nant wa­ter and mov­ing pos­si­ble sed­i­ment de­posits that have slowly built up in the pipes over time, due to in­ter­nal cor­ro­sion.

With­out flush­ing, these de­posits would in­crease in the pipes re­sult­ing in:

d d d d d d

De­creased in­ter­nal pipe size, af­fect­ing flow In­abil­ity to de­liver fire flows Ad­di­tional dis­in­fec­tant de­mand Chlo­rine degra­da­tion, low resid­u­als Taste, odour and colour com­plaints Lower resid­ual pres­sure

Each year Tararua Al­liance staff carry out a pro­gramme of ydead end mains flush­ingz and yhy­drant flow and pres­sure test­ingz to en­sure these is­sues do not oc­cur. The process is part of a rou­tine main­te­nance pro­gramme that is nec­es­sary to main­tain the in­tegrity of the wa­ter sys­tem, and en­sures res­i­dents re­ceive the high­est qual­ity wa­ter pos­si­ble.

The flush­ing in­cludes clean­ing or yscour­ingz the in­te­rior of wa­ter pipes by open­ing a hy­drant and send­ing a rapid flow of wa­ter through them for a short pe­riod of time. Wa­ter is some­times dis­coloured af­ter wa­ter­main clean­ing, but this usu­ally does not last long. While not harm­ful it is rec­om­mended that res­i­dents do not use dis­coloured wa­ter for any pur­pose that re­quires clean wa­ter, such as pre­par­ing foods and bev­er­ages, med­i­cal and den­tal pro­ce­dures or do­ing laun­dry.

In the event res­i­dents draw dis­coloured wa­ter into the home, this can be rec­ti­fied by run­ning a cold tap for 5-10 min­utes.

As a pre­cau­tion, prior to us­ing hot wa­ter it is rec­om­mended a cold tap is run for a few min­utes to en­sure dis­coloured wa­ter is not drawn into the hot wa­ter sys­tem.

Tararua Al­liance will be con­duct­ing their next round of ydead end mains flush­ingz later this month fol­lowed by yhy­drant flow and pres­sure test­ingz which will be un­der­taken in Fe­bru­ary.

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