Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 811 - Requirements For The Operation And Design Of Community Water Systems
Subchapter III - Source Development - Surface Water
Section NR 811.22 - Intakes
Current through August 26, 2024
Intake structures shall provide for all of the following:
(1) Velocity of flow .25 to .50 feet per second through the inlet structure so that frazil ice will be held to a minimum.
(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.
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.
(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.
(3) Inspection manholes every 1,000 feet.
(3m) Means for cleaning of the inlet pipe.
(4) Adequate protection against rupture by dragging anchors, ice, and other activity.
(5) Locations referenced by permanent monuments or latitude and longitude as measured by a Global Positioning System (GPS).
(6) A diversion device capable of keeping large quantities of fish or debris from entering an intake structure where shore wells are not provided.
(7) Control of nuisance organisms where necessary in accordance with s. NR 811.232.
