§ 15-13-7 — DEVELOPMENT PROJECT REQUIREMENTS

§ 15-13-7 - DEVELOPMENT PROJECT REQUIREMENTS.

(A) This subsection applies to a large development project subject to Section 25-9-414 (Onsite Water Reuse System Requirement). (1) A project applicant shall design and construct the OWRS as required by this subsection. (2) A permittee shall maintain and operate the OWRS as required by this subsection. (3) Except as provided by Subdivision (4), an OWRS must provide the following non-potable end uses: toilet and urinal flushing, irrigation, and cooling applications. (4) An OWRS for a project that includes four or more multi-family buildings for which the floor-to-area ratio is less than one is only required to provide irrigation as a non-potable end use. (5) To the extent required by the water balance calculator approved for the project, rainwater and condensate water are the only alternative water sources required in the OWRS and must be collected in a single tank and reused for non-potable uses. (B) This subsection applies to a small development project subject to the cooling towers standards of Section 25-12-133 (Local Amendments to the Uniform Mechanical Code). (1) A project applicant shall design and construct the OWRS as required by this subsection. (2) A permittee shall maintain and operate the OWRS as required by this subsection. (3) To the extent required by the water balance calculator approved for the project, the collection and reuse of condensate water shall be used for make-up water for evaporative cooling towers if the small development project includes an evaporative cooling tower system with a combined cooling capacity of 100 tons or more. (C) An applicant for a development project described in Subsections (A) or (B) shall use the water balance calculator to prepare a project summary assessing the amount of alternative water produced on site by the required alternative water sources and the amount of alternative water needed to supply the required non-potable uses. (D) If, based on the water balance calculator project summary, the available supply from required alternative water sources exceeds the demand from required non-potable uses, 100 percent of that demand shall be met by using the required alternative water sources. (E) If, based on the water balance calculator summary, the available supply from required alternative water sources is less than the demand from required non-potable uses, 100 percent of the available supply from required alternative water sources shall be used to meet the demand from required non-potable uses. (F) Small or large development projects may use reclaimed water or other allowed alternative water sources specified in Section 15-13-5 (Allowed Alternative Water Sources) to meet required non-potable uses required by this section so long as the reclaimed water or other alternative water sources provide an equivalent or greater amount of non-potable water as the required alternative water sources identified in the water balance calculator project summary. (G) This subsection applies to small development projects and large development projects. (1) A record owner shall pay a fee, set by separate ordinance, for excess usage of retail water provided by Austin Water. (2) Excess usage of retail water occurs when a development project uses retail water in an amount that exceeds the amount of allowable makeup water. (3) A development project's allowable make-up water is retail water in an amount established by the water balance calculator approved for the development project. (4) The fee established under this subsection must be based on Austin Water's cost to provide retail water that is not recovered by another fee.

Source: Ord. No. 20240307-003, Pt. 3, 4-1-24.