Apart from wanting to dredge rivers and add to the public coffers, one reason that Ilan County embarked on public production of gravel was to gain control over the entire process and thus stamp out crime and corruption.
宜蘭縣採用公共造產方式的原因，除了疏浚河川、增加收入之外，透過政府直接介入、全程管控以杜絕不法，也是重要的因素。