Wagga City Council will look at using funds from other budgets to cover the shortfall from the original allocation of $23.2 million for a design to protect the city centre from a one-in-100-year flood.

A report by senior project manager Darryl Woods to Monday night's council meeting stated that the upgrade was "progressing to schedule".

"To date there has been a number of contract variations, for reasons of design errors in the specification, incorporation of other projects into the levee and for aesthetic and practical reasons," he stated.

Mr Woods reported a "budget shortfall of $925,738".

"It is proposed to fund $581,297 of the budget shortfall from the Active Travel Plan Budget allocation for paths for the levee location, and $344,441 from the (flood levee) Stage 2 Contingency budget," he stated.

The biggest additional cost was for more than $830,000 to switch a levee pathway from granite to concrete, requiring an additional three metres in width and additional strength to allow maintenance truck access.

The council also had to pay an additional $125,000 to increase the gauge of metal sheetpiling used as a water barrier along parts of the levee.

Council made almost $72,000 in savings from Roads and Maritime Services agreeing to complete an element of the levee project as part of its own works.

The upgrade was originally funded using a $7.75 million special rate variation and $14.1 million in state and federal government grants.

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