Community drainage system planning, design, and maintenance in northern communities

1.1 Scope 
This Standard specifies provisions for the planning, design, and maintenance of surface drainage systems within northern community boundaries. Provisions for drainage outside the community boundary are not covered by this Standard. 

Note: Specific resources and expertise are required to address drainage provisions outside the community boundary. These resources and expertise might be beyond the capacity of an individual community. 

1.2 Application 
This Standard specifies provisions for site-level and community-wide drainage system planning, development, and operations. The provisions apply to drainage systems used for the collection, conveyance, detention, and discharge of excess surface water in the form of overland flow, originating from precipitation, snowmelt, or ice melt. 

Note: Excess surface water is net of precipitation, soil infiltration, and evaporation. 

1.3 Exclusions 
This Standard does not cover 
a) drainage systems associated with facilities that might inherently produce contaminated drainage, such as

i) solid waste management systems and components; and 
ii) sewage treatment systems and components;

b) drainage directly from storm surges in lakes or oceans; 
c) drainage directly from riverine flooding; 
d) subsurface drainage; and 
e) watershed level drainage planning.