Wisconsin Administrative Code › Department of Natural Resources › NR 500-599 - Environmental Protection - Solid Waste Management › Chapter NR 504 - Landfill Location, Performance, Design And Construction Criteria › Section NR 504.09 - Storm water management and miscellaneous design and construction criteria for landfills

Current through June 24, 2024
(1) STORM WATER MANAGEMENT.
(a) Storm water drainage ditches, structures
				and sedimentation basins shall be designed such that the construction of these
				items shall occur during the initial stage of construction to control rainfall
				runoff and limit entrained sediment from reaching surface water
				bodies.
(b) All landfills shall
				incorporate the following concepts in the design of both temporary and
				permanent erosion and sediment control measures:
1. Grading and construction shall be
				scheduled to minimize soil exposure.
2. Existing vegetation shall be retained
				whenever feasible.
3. Disturbed
				areas shall be vegetated and mulched.
4. Runoff shall be diverted away from
				disturbed areas and active fill areas.
5. Runoff velocities shall be
				minimized.
6. Drainageways and
				outlets shall be prepared to handle concentrated or increased runoff.
7. Sediment shall be trapped on
				site.
8. Runoff control structures
				shall be inspected and maintained.
(c) The design calculations required in pars.
				(d), (e) and (f) shall each be performed for the period in the landfill's
				development where the combination of surface conditions and contributing
				acreage would result in the greatest runoff volume.
(d) All temporary and permanent storm water
				drainage ditches, swales, conveyance channels, channel linings, outlet
				protection, culverts and other storm water control structures handling flow
				onto or off the landfill shall be designed to accommodate peak flow rates from
				a 25 year, time of concentration storm event.
(e) Temporary and permanent sediment control
				measures shall be designed to settle 0.015 mm size particles for all storms up
				to and including the 25 year, 6-hour storm. The surface area for sediment
				basins shall be calculated using the rainfall intensity over the 25 year,
				6-hour storm event for the landfill. Principal spillways, and outlet protection
				for sediment basins shall be designed to pass a 25 year, time of concentration
				storm event. Emergency spillways for sedimentation basins shall be designed to
				pass a 100 year, time of concentration storm event. The design of the
				dewatering structures for sediment basins shall be selected such that the basin
				is dewatered in no less than 3 days. An analysis shall be performed to document
				compliance with this requirement.
(f) Storm water shall be diverted away from
				the active fill area of the landfill and any borrow areas to a sedimentation
				control structure.
(g) Containment
				berms placed around active fill areas shall be designed to control and collect
				the liquid volume resulting from the 25 year, 24-hour storm event. The design
				shall consider the volume of liquid generated from active fill areas which
				shall include areas with exposed solid waste or areas with waste covered by
				daily cover. Storm water in contact with active fill areas shall be handled and
				treated as leachate in accordance with ch. NR 506.
(h) Storm water drainage ditches, structures
				and sedimentation basins shall discharge along existing drainage patterns
				capable of accepting the anticipated flow volume. An analysis shall be
				performed to determine the amount and velocity of runoff prior to landfill
				development and to document compliance with this requirement.
(i) Storm water diversion and construction at
				a landfill shall be designed to minimize impacts on adjacent property, such as
				erosion, sedimentation and flooding.
(j) Design of all storm water management
				features shall comply with other applicable requirements of the department.
				Such requirements include, but are not limited to, ch. NR 103, and permits
				required by ch. 30, Stats.