§ 18.40.140. Drainage/flood protection facilities.

Drainage/inundation protection facilities development standards in the IP district are as follows:

A.

Determination of Necessity—Generally.

1.

All drainage, flood control and inundation protection facilities deemed necessary by the Napa County Flood Control and Water Conservation District to provide urban-level inundation protection to the subject property and prevent intensified downstream flooding shall be installed as part of project approval.

2.

All storm drains and flood control channels serving a parcel shall be extended to that parcel's far property line except when the director of public works finds that such an extension is unnecessary to provide drainage and/or inundation protection to adjoining properties.

B.

Dedications.

1.

The rights-of-way for all storm drains outside road rights-of-way, flood control channels and other inundation protection facilities identified in the specific plan and/or master storm drainage/flood control plan for the area involved that border or pass through the subject parcel shall be irrevocably offered for dedication to the Napa County Flood Control and Water Conservation District before project occupancy or parcel/final map recordation, whichever comes first. If a master storm drainage/flood control plan does not exist at the time a project is submitted for approval, the developer shall submit one as part of his application. Said plan shall identify the improvements needed to alleviate existing flooding problems and handle the runoff generated by development of the area.

2.

Rights-of-way offered for dedication shall be of sufficient size to accommodate the facility involved, including provisions for pedestrian, bicycle and vehicle access and maintenance. Where a planned drainage or inundation protection facility or flood control channel runs between two parcels, half the ultimate right-of-way shall be irrevocably offered for dedication by the property owner involved.

C.

Improvement Requirement. All drainage, flood control and inundation protection facilities required shall be installed by the project developer or a benefit assessment district prior to project occupancy. Said installation shall include all levees, tide gates, holding ponds, pumps, etc., required.

D.

Improvement Standards.

1.

Construction of any storm drain, flood control channel or other inundation protection facility installed in an area covered by a specific or master storm drain/flood control plan shall be consistent with the standards contained in said plans, the adopted County Road and Street Standards, as amended, and all adopted Napa County Flood Control and Water Conservation District plans and policies. In cases where there is a conflict, the more restrictive standards shall apply.

2.

Detailed drainage improvement/inundation protection provision plans shall be submitted to, and reviewed and approved by, the director of public works prior to, and as a prerequisite for, building permit issuance. Said plan shall provide specific measures for the alleviation of flooding effects, erosion and sedimentation control, and correction of on-site ponding.

(Ord. 1161 § 16, 1999: Ord. 1160 § 9, 1999; Ord. 845 § 1 (part), 1987: prior code § 12278.13)