Home Drainage & Causes of Basement Flooding. Water

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1 Home Drainage & Causes of Basement Flooding

2 Understanding Drainage There are two separate sewer systems Eavestroughs & Downspout Road Property Line Floor Drain Catch basin Access Cover Weeping Tile House Connection(s) Private Side City Side Maintenance Hole Curb & Gutter Wastewater System Stormwater Sanitary Sewage System Overland Toilets (Surface) Flow Underground Washing Machines sewers Outlets Sinks to watercourses Showers Floor drains

3 How Does my House Connect to the City Sewers? Household plumbing should connect to sanitary sewer only Storm Sewer Sanitary Sewer

4 How Does my House Connect to the City Sewers? Historically, roof drains (downspouts) connected underground to storm sewer Storm Sewer Sanitary Sewer

5 How Does my House Connect to the City Sewers? Weeping tiles (foundation drains) connected to either storm or sanitary sewer Storm Sewer Sanitary Sewer

6 How Does my House Connect to the City Sewers? Newer homes no longer connect weeping tiles to the sewer, instead a sump pump discharges to surface Also, downspouts now flow to surface Storm Sewer Sanitary Sewer

7 How Are Sewers Sized? Sanitary Sewers - sized to take all wastewater from contributing homes, businesses and industries + an allowance for extraneous water Storm Sewers - sized to take average frequent rainfall events only; surface to take remainder Cannot be sized to capture every possible rainfall Drainage system generally operates as intended under normal conditions and average rainfalls

8 What is Source of Problem? Extreme Events

9 What is Source of Problem? Extreme Events Sewer physical structural problems

10 Sewer Physical Structural Problems Defective Connection Cracks Root Mass Encrustation at Joint Broken Pipe Debris Buildup Protruding Lateral Grease Buildup

11 What is Source of Problem? Extreme Events Sewer physical structural problems Surface flooding

12 What is Source of Problem? Extreme Events Sewer physical structural problems Surface flooding Excess storm water entering sanitary sewer

13 Excess Stormwater Entering Sanitary Sewer Sources of high flows to sanitary sewers: Illegal cross-connections Foundation drains Infiltration Joints and pipe connections Broken pipes Cracks in the sewer system and maintenance holes Inflow Holes in maintenance covers (low areas) Stormwater-flooded basement (floor drain)

14 Typical Causes of Basement Flooding Flooded street Blocked street catch basin Property line Downspout to storm sewer Surface Into Basement -poor lot drainage -eavestrough overflow -plugged downspout -leaky windows & doors Surface water through MH top Floor drain Cracked MH or sewer City s storm sewer Leaky laterals Foundation drain to sanitary or storm sewer Cracked Basement Wall City s sanitary sewer Blockage in sewer or house lateral Cracked Sewer Sewer Blockage Sewer Protrusion Reverse-slope Driveway Poor Lot Grading

15 What Happens When It Rains? Rainwater on the Surface

16 Storm Drainage System Extreme rainfall events are not supposed to enter storm sewer, instead flow overland to outlet (creeks, ponds, lakes, etc) Where no outlet exists (road low points), excess surface water will pond which can enter the sanitary sewer system

17 Examples of Surface Conditions

18 Under extreme events & once sewer capacity is reached, if no overland outlet, ponding will occur on the surface Overland Flow Paths & Cause of Surface Flooding

19 Examples of Surface Conditions

20 Low Point Basement Flooding Animation

21 Basement Flooding Animation

22 Basement Flooding Animation

23 What Happens When It Rains? Interaction of Surface with the Sewer Systems Resulting in Basement Flooding

24 Street Flooding Animation

25 Street Flooding Animation

26 Street Flooding Animation

27 Street Flooding Animation

28 Street Flooding Animation

29 Elsewhere Along the Sewer System Street Flooding Animation

30 Thank You Staff are available tonight to discuss this information further

31 Understanding Drainage Eavestroughs & Downspout Property Line Overland Flow Route Floor Drain Catch basin Access Cover Curb & Gutter Weeping Tile Storm Sewer Maintenance Hole House Connection(s) Private Side City Side Sanitary Sewer

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