ACS Engineers have been engaged by Central Highlands Regional Council to provide a drainage management plan that incorporates the upgrades to the Emerald Airport. The drainage management was developed to identify the potential stormwater related impact from the proposed development upgrades and provide mitigation measures to ensure no negative impacts to future lots or downstream properties of events up to 1% Annual Exceedance Probability (AEP). RORB was utilised to study the peak discharge estimates, and to indicate the storage and attenuation differences throughout the catchment.