The HK$678 million (£53 million) Happy Valley underground storm water storage scheme is the largest NEC3 Engineering and Construction Contract (ECC) option C (target contract with activity schedule) awarded by the Hong Kong government to date. It is also the first in Hong Kong to trial the NEC3 Engineering and Construction Subcontract (ECS). https://www.neccontract.com/NEC-in-Action/Case-Studies/Happy-Valley-underground-stormwater-storage-scheme