Current through August 31, 2023
Written approval by the Department is required before water
from any new surface source or ground water source that is under the direct
influence of surface water may be served to the public. Infiltration collection
lines or galleries are considered ground water under the direct influence of
surface water unless demonstrated otherwise. Infiltration galleries that are
not directly influenced by surface water shall meet the requirements of Section
514. The area around infiltration
lines shall be under the control of the water purveyor for a distance
acceptable to the Department. (3-24-22)
01.
Intake Structures. Design of
intake structures shall provide for: (3-24-22)
a. Withdrawal of water from more than one (1)
level if quality varies with depth. (3-24-22)
b. Separate facilities for release of less
desirable water held in storage. (3-24-22)
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. (3-24-22)
d. Inspection manholes every one thousand
(1000) feet for pipe sizes large enough to permit visual inspection.
(3-24-22)
e. Cleaning the intake
line as needed. (3-24-22)
f.
Adequate protection against rupture by dragging anchors, ice, or other hazards.
(3-24-22)
g. Ports located above
the bottom of the stream, lake or impoundment, but at sufficient depth to be
kept submerged at low water levels. (3-24-22)
h. Where shore wells are not provided, a
diversion device capable of keeping large quantities of fish or debris from
entering an intake structure. (3-24-22)
i. If necessary, provisions shall be made in
the intake structure to control the influx of nuisance aquatic organisms.
Specific control methods must be approved by the reviewing authority.
(3-24-22)
j. When buried surface
water collectors are used, sufficient intake opening area must be provided to
minimize inlet headloss. Particular attention shall 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. (3-24-22)
02.
Raw Water Pumps. Raw water
pumping wells shall: (3-24-22)
a. Have motors
and electrical controls located above grade (except for submersible pumps), and
protected from flooding as required by the reviewing authority.
(3-24-22)
b. Be accessible and
designed to prevent flotation. (3-24-22)
c. Be equipped with removable or traveling
screens before the pump suction well. (3-24-22)
d. Provide for introduction of chlorine or
other chemicals in the raw water transmission main if necessary for quality
control. (3-24-22)
e. Where
practical, have intake valves and provisions for back flushing or cleaning by a
mechanical device and testing for leaks. (3-24-22)
f. Have provisions for withstanding surges
where necessary. (3-24-22)
03.
Offstream 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 shall be
constructed to assure that: (3-24-22)
a.
Water quality is protected by controlling runoff into the reservoir.
(3-24-22)
b. Dikes are structurally
sound and protected against wave action and erosion. (3-24-22)
c. Intake structures and devices meet
requirements of Subsection
515.01. (3-24-22)
d. Point of influent flow is separated from
the point of withdrawal. (3-24-22)
e. Separate pipes are provided for influent
to and effluent from the reservoir. (3-24-22)
04.
Reservoirs. Impoundments and
reservoirs shall provide, where applicable: (3-24-22)
a. Removal of brush and trees to high water
elevation. (3-24-22)
b. Protection
from floods during construction. (3-24-22)
c. Abandonment of all wells which will be
inundated, in accordance with requirements of the Idaho Department of Water
Resources. See Rules of the Idaho Water Resources Board referenced in
Subsection 002.02.
(3-24-22)
