Indiana Administrative Code › Title 312 - NATURAL RESOURCES COMMISSION › Article 10 - FLOOD PLAIN MANAGEMENT › Rule 5 - General Licenses and Specific Exemptions from Floodway Licensing › Section 5-8 - Qualified outfall projects; general license

Current through July 10, 2024
Authority: IC
				  14-10-2-4; IC
				  14-28-1-5
Affected: IC 14-28-1; IC 14-29-1
Sec. 8.
(a) This
				section establishes a general license for the placement of a qualified outfall
				project in a floodway.
(b) A person
				who wishes to implement a project for the placement of a qualified outfall
				project on a river or stream, other than on a river or stream identified in
				section 0.3(b) or 0.3(c) of this rule, may do so without notice to the
				department if the project conforms to the following conditions:
(1) Tree removal and brush clearing shall be
				contained and minimized within the outfall project area. No more than one (1)
				acre of trees shall be removed within the floodway.
(2) Construction activities within the
				waterway from April 1 through June 30 shall not exceed a total of two (2)
				calendar days.
(3) Best management
				practices shall be used during and after construction to minimize erosion and
				sedimentation.
(4) Following the
				completion of construction, disturbed areas shall be reclaimed and revegetated.
				Disturbed areas shall be mulched with straw, wood fiber, biodegradable erosion
				blanket, or other suitable material. To prevent erosion until revegetated
				species are established, loose mulch shall be anchored by crimping, tackifiers,
				or netting. To the extent practicable, revegetation must restore species native
				to the site. If revegetation with native species is not practicable,
				revegetation shall be performed by the planting of a mixture of red clover,
				orchard grass, timothy, perennial rye grass, or another species that is
				approved by the department as being suitable to site and climate conditions. In
				no case shall tall fescue be used to revegetate disturbed areas.
(5) Disturbed areas with slopes of three to
				one (3:
1) or steeper, or areas where run-off
				is conveyed through a channel or swale, shall be stabilized with erosion
				control blankets or suitable structural armament.
(6) Areas in the vicinity of concentrated
				discharge points shall be protected with structural armament to the normal
				water level of the waterway. Any riprap must have an average minimum diameter
				of six (6) inches and extend below the normal water level.
(7) The size of the outfall project shall not
				exceed any of the following dimensions:
(A)
				Ten (10) square feet in cross-sectional flow area as determined by the
				summation of cross-sectional area of conduits within the outfall project area
				for an outfall structure.
(B) Five
				(5) feet deep as determined by the difference in elevation between the lowest
				bank elevation and the bottom of the swale for an outfall structure.
(C) An area of disturbance thirty (30) feet
				wide.
(8) Adequate cover
				shall be provided to ensure the structural integrity of the outfall conduit and
				to allow suitable vegetative growth.
(9) Within the project area, the
				postconstruction ground surface elevation shall be less than six (6) inches
				above the preconstruction elevation.
(10) The outlet structure shall:
(A) be supported by a headwall, slopewall, or
				anchored end section; and
(B)
				conform to the bank of the waterway.
(11) If flow passing through the outfall
				project in a reverse direction would induce flood damages during a regulatory
				flood, the outfall project shall be equipped with a closure
				mechanism.
(12) Construction debris
				and material not used as backfill shall be removed from the floodway.