Rainwater is directed away from walls at surface. Any water infiltrating is captured in drains below foundation

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1 Ground Surface Rainwater is directed away from walls at surface. Any water infiltrating is captured in drains below foundation Ground Surface Soil Ground Water Level Basement Wall Groundwater drains to weeping tiles, keeping it away from walls and below house foundation so water does not stay in contact with basement Foundation Drain Groundwater Table Basement

2 There are several ways a house s foundation drainage can work. A detailed investigation by a licensed professional is required to determine how your house works. Sometimes, the downspouts connect directly to the foundation drains. Not all houses have foundation drainage. Front Yard Sanitary Under Basement Floor Often, they drain under the basement floor and connect to the service lateral inside the house. The foundation drains can be connected to either the sanitary sewer, storm sewer, or the surface via sump pump.

3 To be completely isolated from backup in the City sewer system, you need: 1. Disconnection of downspouts from City sewers 2. Backflow valve on the sanitary sewer line 3. Disconnection of foundation drains from City sewers and severance (capping) of the storm lead (if it exists) 4. Installation of sump pump to drain foundation drain to surface

4 Disconnection of the roof downspouts from the underground sewer system, to reduce the direct inflow of water to the municipal system. Measuring Cutting Pipe Capping Inlet Direct to Splash Pad Assessment of the house layout, number of downspouts, and surrounding land Cutting the downspout pipe(s) and adding an elbow joint to redirect the water to a grassed surface away from the building Use of a concrete or plastic splash-pad to prevent erosion Capping and sealing the old ground connection(s) to be water-tight Moist ground conditions after rainfall Temporary ponding in front or rear yard Additional downspout pipe discharge locations Finding suitable locations to outlet (grass) Preventing outflow from causing flooding or ice on own or neighbouring property

5 A mechanical valve that only allows one-way flow through it. It is placed on the storm and/or sanitary service line to prevent City-system backup from entering the home. To City Sewer From House Normal Open Position Backflow Closed Position Example Model Mainline Fullport Valve Hiring of a qualified professional Investigation of what pipe connections the house has, and if interconnection between the storm and sanitary system exists Camera of existing service connection Small excavation in basement floor, normally at front of house Correct installation of valve Proper sealing of pipe connections Homeowner to select and hire a licensed drainage contractor/plumber to do work Out-of-pocket expense (City subsidy program available to assist) Excavation of basement floor and associated mess/disturbance Requires regular maintenance to ensure proper operation

6 A mechanical valve that only allows one-way flow through it. It is placed on the storm and/or sanitary service line to prevent City-system backup from entering the home. When water from the City-system backs-up the private service line, floats on the valve gate lift the gate closed While this prevents water from the sewer from entering your home, it also prevents internal water from exiting Once City sewer is open again, water exits the valve and the gate reopens To City Sewer From House Determining gproper p placement of the valve on house plumbing such that no other connections bypass the valve Locating a suitable place in the basement floor to excavate the valve pit Making sure that the valve is regularly maintained and operating properly p Valve Pit in Floor Making sure not to use household plumbing during rain storms, because when the valve is closed due to back-up, internal plumbing (sinks, bathtubs, toilets, laundry, etc) when it rains to prevent self-flooding has no outlet

7 A mechanical valve that only allows one-way flow through it. It is placed on the catchbasin storm connection to prevent City-system backup from entering the driveway/garage. When water from the City storm system backs-up the private service line, the valve gate closes While this prevents water from the sewer from reaching the driveway surface, it also prevents surface water from draining Once City sewer is clear again, the gate reopens and the catchbasin can drain May require sump pump to drain catchbasin to higher ground when valve is closed Driveway Catchbasin Driveway Water level due to back-up if no valve on catchbasin which can cause water to build up in driveway/garage Making sure that the valve is regularly maintained and operating properly Potential for blockage by debris and/or ice (during spring thaw) Making sure no household plumbing (e.g. weeping tiles or downspouts) is connected to catchbasin or is upstream of new valve. When valve closes due to back-up, water cannot exit service line and could cause self-flooding

8 Disconnecting the house foundation drains (weeping tiles) from the City system will eliminate sewer back-up from impacting your foundation. Foundation drains can be connected to the sanitary sewer, storm sewer, or both, and can be connected to your internal plumbing. Hiring of a qualified professional (plumber, drain contractor, or drainage engineer) Thorough investigation of all underground connections to the house and foundation drain Excavation in the basement and outside along the house where the drains are to be disconnected/reconnected Disconnection of foundation drains from City sewers (cap storm connection) Reconnection of foundation drains to sump pump Restoration of disturbed areas Out-of-pocket expense (City subsidy program available to assist) Excavation of basement floor/outdoors and associated mess/disturbance Back-up electricity for sump pump during power outage Maintenance/replacement over time

9 Disconnect downspout from foundation drain (if exists) Capping the storm sewer connection prevents storm sewer backup from affecting the foundation drains or internal plumbing Installing a sump pump will drain the groundwater that builds up around the basement walls and foundation Redirect foundation drains (weeping tiles) to a sump pit/pump Discharge sump pump away from basement wall Sever and cap the storm connection (if exists)

10 Disconnection of the foundation drains from the City sewer requires introducing a new outlet for the groundwater drainage. A sump pump can collect this water and discharge it safely to the surface. Water collects in a sump pit, located within your basement floor The foundations drains are reconnected to the sump Over time, the sump fills with groundwater Once the water level in the sump reaches a set maximum limit, the pump p is turned on and the sump pit is drained The pumped water is directed to the surface

11 Private drainage system solutions can be complex and will differ from that shown. It is critical that the homeowner carry out an investigation with a licensed plumber, drain contractor, or drainage engineer to understand how the existing drainage system operates before determining the appropriate isolation solution To City Sanitary Sewer Sever & Cap Storm To City Storm Sewer Internal plumbing drains to the sanitary sewer A sanitary backflow valve is installed in the house Install Sanitary Backflow Valve Install Sump Pump Redirect weeping The foundation drains are tile connection o to redirected to a sump pit sump A sump pump is installed and discharges to the surface, away from the building wall Downspouts are disconnected from the subsurface systems and directed away from the building walls The storm connection is severed ered (capped), preventing enting any backup from the storm sewer from affecting the house FD Sever & Cap Sump Pump Disconnect Downspouts

12 Complete isolation from the sewer system depends on a prior thorough investigation to determine how the system works, proper installation, and continued regular maintenance. Improperly Isolated Properly Isolated High Water Level in Storm Sewer Street BREATHERS CAPPED STORM CONNECTION BASEMENT FLOOR DRAIN FOOTING WEEPING TILE SUMP PUMP Loose backflow valve cap on storm sewer causes stormwater to enter house Water in basement enters floor drain resulting in overloading of sanitary sewer Foundation drains connected to storm pipe; water builds up around basement walls BACKFLOW VALVE TRAP Backflow valve prevents sanitary backup from entering house Storm connection capped preventing storm backup from entering house Sump pump installed to drain foundation drains (weeping tiles)