Chapter 74-6 — PERMITS, DRAINAGE AND STREETS

(a)

Suitable open drainage facilities (such as gutters, ditches, open conduits, or channels, whether of earth or lined with an acceptable material) shall be provided to protect all buildings, structures, and improvements from dampness, ponding, and inundation by storm, rain, surface, foreign, flood, and subsurface waters originating within or without the boundaries of the property.

(b)

Subsurface drainage facilities for controlling, lowering, or intercepting ground water or subsurface flow shall be installed wherever the water might be detrimental to any building or structure or might contribute to the

instability either of the foundation soil or of any earth material adjacent to or adjoining the building or structure.

(c)

Drainage of water from swimming pools and similar improvements (but not waste from water treatment facilities) shall be conveyed, preferably in closed conduits, to a storm drainage facility or a natural channel or watercourse, without injury to buildings, structures, or improvements within or without the property boundaries and without causing erosion.

(d)

Properly recorded easements or reserves shall be provided for all drainage structures and facilities (except roof and swimming pool drains), and shall be fully designated for the exclusive purpose for which the parcels shall be used.

(Ords. 2002-31 § 3, 99-1 § 6: 74-30).

No building permit shall be issued for the construction within the boundaries of any future street as shown on future street-line maps recommended by the director of public works and adopted from time to time by the board of supervisors.

(Ords. 2002-31 § 3, 99-1 § 6: 74-30).

No building permits for the construction of any structure or improvement for which a permit is required shall be issued unless the applicant shall make an agreement that as a part of such construction:

(1)

If required by the county, there shall be constructed a sidewalk and curb across the property upon which such structure is proposed, at the grade and in accordance with the specifications of the director of public works;

(2)

The property on which the proposed structure is to be built shall be graded in reasonable relation to the grade of the public street or way on which the property abuts. In determining this reasonable relationship, the county building official shall consider, among other factors, safe vehicular access to and from the property, adequate drainage, and visibility along the adjacent public street;

(3)

Vehicular access to and from the property shall be provided only in locations approved by the county building official.

(Ords. 2002-31 § 3, 99-1 § 6: 74-30).

(a)

No building permit shall be issued for the construction of any permanent structures, other than drainage structures, within, under or over any structure setback area covered by a drainage easement or a deed of development rights and established pursuant to Chapter 914-10.

(b)

Whenever the property upon which a building permit is sought includes a structure setback area, the county building official shall refer the application to the public works department for verification of the structure setback line.

(Ords. 2002-31 § 3, 99-1 § 6: 85-40).

(a)

When Required. A drainage plan is required for any building, structure or improvement that requires a building permit and falls within one of the following categories:

(1)

Results in an impervious surface of one thousand square feet or more;

(2)

Involves grading, or removal of vegetation down to bare soil by any method, of more than ten thousand square feet;

(3)

Is subject to local ponding due to soil or topographic conditions;

(4)

Is located within a special flood hazard area, as defined in Section 82-28.504;

(5)

Involves land disturbance or structure placement within one hundred feet of the top bank of any watercourse shown with a blue line on the most current USGS seven and one-half minute quadrangle map;

(6)

Involves construction of five hundred square feet or more on land where the slope exceeds ten percent;

(7)

Is located in an area identified by the county building official as having a history of flooding or erosion that may be further aggravated by, or have a harmful effect on, the construction or adjoining properties.

(b)

Contents.

(1)

A drainage plan shall include the following site information:

(A)

Flow lines of surface and subsurface waters onto and off of the site;

(B)

Existing and finished contours, at two-foot intervals;

(C)

The location of any existing buildings, structures or improvements on the property where the work is to be performed and on adjacent lots;

(D)

Sufficient information to demonstrate compliance with Chapters 816-4 and 816-6;

(E)

The location of all existing natural and man-made drainage facilities for the storage or conveyance of runoff, including drainage swales, ditches, culverts and berms, sumps, sediment basins, channels, ponds, storm drains and drop inlets serving the site.

(2)

A drainage plan shall include the following drainage information:

(A)

The location of all proposed natural and man-made drainage facilities for the storage or conveyance of runoff, including drainage swales, ditches, culverts and berms, sumps, sediment basins, channels, ponds, storm drains and drop inlets;

(B)

All surface and subsurface drainage devices, walls, cribbing, dams and other protective devices to be built with or as a part of the proposed construction;

(C)

Hydraulic calculations that show the flow-carrying capacities of proposed conveyance devices and justify the estimated runoff of the area served by any proposed conveyance device;

(D)

Discharges and velocities of proposed conveyance devices, and storage volumes of any sumps, ponds or sediment basins.

(3)

Engineered Drainage Plans. A drainage plan shall be prepared by a registered civil engineer if construction is proposed for land where the slope exceeds twenty percent or if the land is identified by the county building official, based on the most current USGS seven and one-half minute quadrangle map or other published sources, as having a history of unstable soil or landslides. An engineered drainage plan shall include estimates of existing and increased runoff resulting from proposed improvements and methods for reducing the velocity of any increased runoff, in addition to all other information required by this section.

(4)

Geotechnical Reports. If a drainage plan shows that discharge resulting from the proposed construction will occur over land where the slope exceeds twenty percent or over land with a history of unstable soils, then a geotechnical report shall also be prepared.

(c)

Procedures. A drainage plan shall be submitted with the building permit application. Drainage plans shall be neatly and accurately drawn, at an appropriate scale that will enable ready identification and recognition of submitted information. Drainage plans shall be prepared in accordance with written standard specifications on file with the county building official. A drainage plan is not considered approved until the county building official approves the plan in writing.

(d)

Violations.

(1)

The failure to submit a required drainage plan is a violation of this section.

(2)

The failure to comply with an approved drainage plan, including the failure to construct drainage improvements specified in an approved drainage plan, is a violation of this section.

(Ord. 2007-01 § 2).