There shall be submitted to and approved by the West Des Moines public works department, a master stormwater management plan for the entire development which shall govern the overall stormwater management of the development. More specific stormwater management proposals may be required with the development of each parcel, which shall be prepared by the developer prior to development within the parcel. The method of stormwater management and the conveyance system shall be determined and approved prior to the development of any portion of the property within the PUD. (Ord. 1514, 3-31-2003)