Lake Moana-nui to re­ceive a facelift

South Waikato News - - NEWS -

Fol­low­ing sev­eral months of in­ves­ti­ga­tion and cost anal­y­sis, the coun­cil has com­mit­ted to spend­ing $629,000 on re­pair work at Lake Moana-nui in Toko­roa.

" Essen­tially there are two prob­lems with the lake, a build of silt at the south­ern end and seep­age through the dam at the north­ern end," coun­cil spe­cial projects man­ager Roger Fisher said.

" Ef­fec­tively the coun­cil has de­cided to fix the seep­age through the dam, re­move the silt that has built up since the lake was con­structed in 1973 and to do some work around pre­vent­ing fur­ther silt build up."

The silt at the south­ern end of the lake will be scraped up to form an is­land in the mid­dle of the lake, around which a one me­tre deep chan­nel will run. This work will be­gin next month de­pend­ing on the avail­abil­ity of the con­trac­tor. The es­ti­mated cost of this por­tion of the project is $108,000.

The re­pair to the face of the dam to fix the leak­ing prob­lem is ex­pected to start in early Fe­bru­ary. The fi­nal de­sign is un­der way by dam engineering spe­cial­ists Tonkin & Tay­lor. The coun­cil will then work through the re­source con­sent and build­ing con­sent process with Waikato Re­gional Coun­cil. The phys­i­cal con­struc­tion work will be put out to ten­der. This por­tion is es­ti­mated to cost $453,000.

"Do­ing this work fixes the cur­rent prob­lems at the lake," said Mr Fisher. "How­ever it doesn’t stop the silt build­ing up again; so the coun­cil has com­mit­ted a fur­ther $68,000 to cre­at­ing a silt trap or fore­bay in the vicin­ity of the walk­ing bridge at the south­ern end of the lake." This work will be un­der­taken in con­junc­tion with the silt re­moval.

Un­til the work is com­plete, the lake will re­main in its near empty state. The coun­cil is aware that the lake is visu­ally un­ap­peal­ing; how­ever given the level of fund­ing that is re­quired to fix the prob­lems, the coun­cil needed to con­duct an ex­tremely thor­ough in­ves­ti­ga­tion into all the op­tions be­fore com­mit­ting to this, deemed the best course of ac­tion.

A no­tice­board is soon to be in­stalled near the dam which will pro­vide a plan of the lake and re­serve area and will show where the con­struc­tion works will take place.

The coun­cil has put up signs and bar­ri­ers warn­ing peo­ple of the po­ten­tial dan­ger in the area. The soft mud is dan­ger­ous. Sev­eral peo­ple have ig­nored the warn­ings and have had to be as­sisted by emer­gency ser­vices per­son­nel. The coun­cil en­cour­ages res­i­dents to ad­here to the warn­ing signs and bar­ri­ers. They are there for a rea­son.

Dur­ing the pe­riod of work, the ar­eas will be clas­si­fied as con­struc­tion sites for au­tho­rised per­son­nel only, the pub­lic is re­quired to stay out of th­ese ar­eas.

The coun­cil reminds res­i­dents that there could be a smell nui­sance, es­pe­cially dur­ing the silt re­moval process.

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