Section R309-515-5 - Surface Water Sources(1) Definition. A surface water source, as is defined in Rule R309-110, shall include tributary systems, drainage basins, natural lakes, artificial reservoirs, impoundments, and springs or wells that have been classified as being directly influenced by surface water. Surface water sources will not be considered for culinary use unless they can be made acceptable by conventional surface water treatment or other equivalent treatment techniques acceptable to the Director.
(2) Pre-design Submittal. The following information must be submitted to the Director and approved in writing before commencement of design of diversion structures or water treatment facilities:
(a) a copy of the chemical analyses required by Rule R309-200 and described in Subsection R309-515-4(5); and(b) a survey of the watershed tributary to the watercourse along which diversion structures are proposed. The survey shall include: (i) determining possible future uses of impoundments or reservoirs;(ii) the present stream classification by the Division of Water Quality, any obstacles to having a stream reclassified 1C, and determining degree of watershed control by owner or other agencies;(iii) assessing degree of hazard to the supply by accidental spillage of materials that may be toxic, harmful or detrimental to treatment processes;(iv) obtaining samples over a sufficient period to assess the microbiological, physical, chemical and radiological characteristics and variations of the water;(v) assessing the capability of the proposed treatment process to reduce contaminants to applicable standards; and(vi) consideration of currents, wind and ice conditions, and the effect of tributary streams at their confluence.(3) Pre-construction Submittal. Following approval of a surface water source, the following additional information must be submitted for review and approval before starting construction:
(a) acceptable evidence that the water system has a legal right to divert water for the proposed uses from the proposed sources;(b) minimum quantity that the surface water source can produce, see Subsection R309-515-5(4)(a); and(c) complete plans and specifications and supporting documentation for the proposed treatment facilities to ascertain compliance with Rules R309-525 or R309-530.(4) Quantity. The quantity of water from surface sources shall:
(a) be assumed to be no greater than the low flow of a 25-year recurrence interval or the low flow of record for these sources when 25 years of records are not available;(b) meet or exceed the anticipated peak day demand for water as estimated in Section R309-510-7 and provide a reasonable surplus for anticipated growth; and(c) be enough to compensate for losses such as silting, evaporation, seepage, and sludge disposal, which would be anticipated in the normal operation of the treatment facility.(5) Diversion Structures. Design of intake structures shall provide for:
(a) withdrawal of water from more than one level if quality varies with depth;(b) intake of the lowest withdrawal elevation located at sufficient depth to be kept submerged at the low water elevation of the reservoir;(c) separate facilities for release of less desirable water held in storage;(d) occasional cleaning of the inlet line;(e) a diversion device capable of keeping large quantities of fish or debris from entering an intake structure; and(f) suitable protection of pumps where used to transfer diverted water.(6) Impoundments. The design of an impoundment reservoir shall provide for, where applicable:
(a) removal of brush and trees to the high water level;(b) protection from floods during construction;(c) abandonment of every well, which may be inundated, refer to applicable requirements of the Division of Water Rights; and(d) adequate precautions to limit nutrient loads.Utah Admin. Code R309-515-5
Amended by Utah State Bulletin Number 2024-13, effective 6/26/2024