8-3-5: INFRASTRUCTURE:

   A.   Surety Agreements:

      1.   Surety Deposit:

         a.   In lieu of completion of the improvements listed in this Section or required as a condition of any zoning or subdivision plat approval, the owner may deposit a surety and sign a surety agreement for their completion. The owner shall deposit the surety and surety agreement improvements with the Director on forms provided by the Development Services Department.

         b.   The amount of surety shall equal at least one hundred twenty percent (120%) of the cost of completing the required improvements. The estimated cost shall be reviewed and approved by the County Engineer.

         c.   The surety shall be drawn solely in favor of, and payable to, the order of the County of Ada, in accordance with the regulations contained in the surety agreement by and between the guarantor and the County of Ada.

      2.   Release Of Surety: The following regulations apply to the release of a surety accepted and deposited as provided in subsection A1:

         a.   The owner shall submit a written request to the Director to return the surety. The request shall include the following documents:

            (1)   A statement from the owner that the required improvements are complete.

            (2)   Two (2) sets of prints of the as-built plans and specifications for all improvements.

         b.   The Director shall verify and certify that the required improvements, as detailed in the surety agreement, are installed.

         c.   The Director shall review and approve the as-built plans.

         d.   Upon certification, the Director shall give notice to the County Treasurer to release the sureties deposited with the County Treasurer in the manner and to the extent as provided for in the surety agreement in accord with the regulations of subsection 1 above.

   B.   Drainage: All required drainage studies and drainage plans shall be based upon peak and total discharge estimates and shall be submitted by a professional engineer licensed in the state of Idaho.

      1.   Drainage Study:

         a.   The drainage study shall identify the essential elements, alignments, and functions of a drainage system.

         b.   The drainage study shall show the following site conditions:

            (1)   Details of existing site drainage and/or irrigation features including, but not limited to, ditches, watercourses, and drainage structures;

            (2)   The permeability and types of soils and geologic materials;

            (3)   The size of the drainage basin upstream;

            (4)   The topography, slope, and geometry of the site;

            (5)   The proximity of surface water within one hundred feet (100');

            (6)   The proximity of potable water supply wells within one hundred feet (100');

            (7)   The proposed use and potential contaminants; and

            (8)   The past use and possible soil and/or ground water contamination.

         c.   Other supplemental data required by the County Engineer.

         d.   The drainage study requirement is also met if the study information required is shown on the drainage plan.

      2.   Drainage Plan:

         a.   When a condition of approval requires approval of a drainage plan by the County Engineer, a drainage plan shall be submitted to the Director that has been prepared by a professional engineer licensed in the state of Idaho for design approval by the County Engineer prior to issuance of a zoning certificate.

         b.   The drainage plan shall be drawn to scale and shall include, but not be limited to, the following:

            (1)   All proposed grading on the property;

            (2)   Essential elements, alignments, and functions of the proposed drainage system including, but not limited to, sewers, storm drains, catch basins, pumps, and seepage beds;

            (3)   The drainage plan shall indicate by flow arrows, contours, spot elevations, or some other acceptable manner, where storm water will be routed for the property. It must show the location and size of any flows onto the site from outside the property boundaries as well as any discharges leaving the site;

            (4)   The proposed use and potential contaminants;

            (5)   When drainage courses and irrigation facilities exist on site, documentary evidence of consent to re-routings by all interested landowners and drainage and irrigation entities affected and having rights to, and in, those facilities shall be provided; and

            (6)   Other supplemental data required by the County Engineer.

   C.   Utilities:

      1.   All utilities shall be installed underground for a new dwelling or approved use.

      2.   For the purposes of this Section, the term "utilities" include, but are not limited to, electric, natural gas, water, wastewater collection, storm drainage, telephone, and cable services.

      3.   Agricultural structures are exempt from this regulation.

   D.   Sewage Disposal And Water: Options for sewage disposal facilities shall include the following methods:

      1.   New development located within an urban service planning area or within a planned community shall be served by sewage disposal facilities that have sufficient available capacity to serve the development.

      2.   Other new developments shall be served by an on-site individual wastewater treatment system and an on-site well, both of which have been approved by the Idaho Department of Water Resources and Central District Health Department.

      3.   If an existing community well fails, the property owner(s) shall connect to a city's, water district's, or utility's water system if a distribution line is located within three hundred feet (300'). If a distribution line is not located within three hundred feet (300'), then the community well may be replaced with a water system approved by the Central District Health Department and Idaho Department of Water Resources.

   E.   Water:

      1.   Purpose: These regulations minimize the development impacts on water resources, such as water supply, consumption, and quality.

      2.   Applicability: These regulations apply to all new development, including but not limited to residential, commercial, and industrial development.

      3.   Exemptions: The following uses are exempt from these regulations:

         a.   All agricultural uses; and

         b.   Existing uses prior to the effective date of this Title.

      4.   Water Conservation Measures:

         a.   Rainwater Harvesting. Rainwater harvesting includes, but is not limited to, cisterns and rain barrels.

            (1)   All commercial and industrial structures over ten thousand (10,000) square feet require the use of rainwater harvesting techniques.

            (2)   All single-family residences greater than twenty-five thousand (25,000) square feet require the use of rainwater harvesting techniques.

            (3)   Cisterns and rain barrel design shall store at least forty (40) gallons of water.

            (4)   Harvested rainwater from cisterns and rain barrels may be used for irrigating landscaped areas, flushing toilets, or pressure washing.

         b.   Pervious Pavement:

            (1)   Pervious pavement includes, but is not limited to, porous asphalt, pervious concrete, and grass or permeable pavers.

            (2)   Pervious pavement is allowed as surface for parking areas. The permeability of pervious pavement in any drainage study required by subsection B above may be considered.

      5.   Green Infrastructure: Green stormwater infrastructure (GSI) techniques, rainwater harvesting, or pervious pavement techniques may be incorporated in any building, surface parking area, or street. These measures may be used to reduce the rate and volume of stormwater runoff and required drainage improvements if the County Engineer determines that:

         a.   The application demonstrates that the improvements will reduce stormwater demands, using generally accepted engineering principles;

         b.   A maintenance plan has been provided that ensures the adequate ongoing maintenance of those facilities; and

         c.   The maintenance plan ensures that the improvements will continue to control the rate and volume of stormwater runoff as shown in the application.

(Ord. 1002, 10-28-2025)