NR 811.21(4)(a) (a) The design of the water treatment plant must consider the worst conditions that are projected to occur during the life of the facility.

NR 811.21(4)(b) (b) Filtration preceded by appropriate pretreatment shall be provided for all surface waters.

NR 811.21(4)(c) (c) Disinfection shall be provided for all surface waters.

NR 811.21(4)(d) (d) Additional treatment may be required by the department based on raw water sampling and other water quality factors.

NR 811.21 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: am. (intro.), (1) (intro.), (b), (e), (2) (a) Register January 2024 No. 817, eff. 2-1-24.

NR 811.22 NR 811.22 Intakes. Intake structures shall provide for all of the following:

NR 811.22(1) (1) Velocity of flow .25 to .50 feet per second through the inlet structure so that frazil ice will be held to a minimum.

NR 811.22(1m) (1m) Sufficient opening area to minimize headloss shall be provided when buried surface water collectors are used. Particular attention should 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.

NR 811.22 Note Note: The department recommends water systems using a surface water supply source include redundant intakes or an alternate means of supplying the maximum day water demand.

NR 811.22(2) (2) Withdrawal of water from the depth of the best water quality or the capability to draw from more than one level or more than one location if water quality varies with depth or location or both.

NR 811.22(3) (3) Inspection manholes every 1,000 feet.

NR 811.22(3m) (3m) Means for cleaning of the inlet pipe.

NR 811.22(4) (4) Adequate protection against rupture by dragging anchors, ice, and other activity.

NR 811.22(5) (5) Locations referenced by permanent monuments or latitude and longitude as measured by a Global Positioning System (GPS).

NR 811.22(6) (6) A diversion device capable of keeping large quantities of fish or debris from entering an intake structure where shore wells are not provided.

NR 811.22(7) (7) Control of nuisance organisms where necessary in accordance with s. NR 811.232.

NR 811.22 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: cr. (1m), am. (3), cr. (3m) Register January 2024 No. 817, eff. 2-1-24.

NR 811.23 NR 811.23 Shore wells.

NR 811.23(1) (1) Shore well structures shall comply with all of the following:

NR 811.23(1)(a) (a) Have motors and electrical controls located above grade and above flood level.

NR 811.23(1)(b) (b) Be accessible for operation and service.

NR 811.23(1)(c) (c) Be designed to prevent flotation.

NR 811.23(1)(d) (d) Be equipped with a minimum of 2 removable or traveling screens or an equivalent means of screening before the pump suction well. Systems with only one screen shall be provided with a bypass.

NR 811.23(1)(e) (e) Provide chlorination or other chemical addition facilities for raw water transmission mains.

NR 811.23(1)(f) (f) Have the intake piping valved with provisions for backflushing, testing for leaks, and control of frazil ice.

NR 811.23(1)(g) (g) Have provisions for controlling surges.

NR 811.23(1)(h) (h) Have sloped bottoms.

NR 811.23(1)(i) (i) Be designed so sanitary sewer and finished water piping located within the shore well is installed in a manner to protect the shore well water quality and preserve the quality of the finished water. It is recommended that piping not be installed above the shore well to allow for access to the piping for routine maintenance.

NR 811.23(1)(j) (j) Water discharged from traveling screens and hub drains within the shore well station may discharge into the shore well.