Section 58.01.08.515 - SURFACE SOURCES AND GROUNDWATER SOURCES UNDER THE DIRECT INFLUENCE OF SURFACE WATERWritten approval by the Department is required before water from any new surface source or groundwater source that is under the direct influence of surface water may be served to the public. Infiltration collection lines or galleries are considered groundwater under the direct influence of surface water unless demonstrated otherwise. Infiltration galleries that are not directly influenced by surface water must meet the requirements of Section 514. The area around infiltration lines must be under the control of the water purveyor for a distance acceptable to the Department.
01.Intake Structures. Design of intake structures must provide for:a. Withdrawal of water from more than one (1) level if quality varies with depth.b. Separate facilities for release of less desirable water held in storage.c. Where frazil ice may be a problem, holding the velocity of flow into the intake structure to a minimum, generally not to exceed point five (0.5) feet per second. Frazil ice is made up of randomly distributed ice crystals that are formed in flowing water that has cooled below thirty-two (32) degrees Fahrenheit and is prevented from forming into ice sheets by the movement of the water.d. Inspection manholes every one thousand (1000) feet for pipe sizes large enough to permit visual inspection.e. Cleaning the intake line as needed.f. Adequate protection against rupture by dragging anchors, ice, or other hazards.g. Ports located above the bottom of the stream, lake or impoundment, but at sufficient depth to be kept submerged at low water levels.h. Where shore wells are not provided, a diversion device capable of keeping large quantities of fish or debris from entering an intake structure.i. If necessary, provisions must be made in the intake structure to control the influx of nuisance aquatic organisms. Specific control methods must be approved by the Department.j. When buried surface water collectors are used, sufficient intake opening area must be provided to minimize inlet head loss. Particular attention must be given to the selection of backfill material in relation to the collector pipe slot size and gradation of the native material over the collector system.02.Raw Water Pumps. Raw water pumping wells must:a. Have motors and electrical controls located above grade (except for submersible pumps) and protected from flooding as required by the Department.b. Be accessible and designed to prevent flotation.c. Be equipped with removable or traveling screens before the pump suction well.d. Provide for introduction of chlorine or other chemicals in the raw water transmission main if necessary for quality control.e. Where practical, have intake valves and provisions for back flushing or cleaning by a mechanical device and testing for leaks.f. Have provisions for withstanding surges where necessary.03.Off-stream Raw Water Storage. An off-stream raw water storage reservoir is a facility into which water is pumped during periods of good quality and high stream flow for future release to treatment facilities. These off-stream raw water storage reservoirs must be constructed to assure that: a. Water quality is protected by controlling runoff into the reservoir.b. Dikes are structurally sound and protected against wave action and erosion.c. Intake structures and devices meet requirements of Subsection 515.01.d. Point of influent flow is separated from the point of withdrawal.e. Separate pipes are provided for influent to and effluent from the reservoir.04.Reservoirs. Impoundments and reservoirs must provide, where applicable:a. Removal of brush and trees to high water elevation.b. Protection from floods during construction.c. Wells which will be inundated by the reservoir must be abandoned in accordance with requirements of the Idaho Department of Water Resources. See Rules of the Idaho Department of Water Resources referenced in Subsection 002.02.Idaho Admin. Code r. 58.01.08.515