Inflow pipe Screened overflow Drain Foul flush diverter Screened intake Manhole cover Maximum water level Seal Inspection cover Possible local drainage through screen Drain Bottom sloped Screened outlet Drainage sump Drainage ditch Stone Perforated silt trap Clean stone or rubble fill Revision and compilation notes Date Registered Office:,,. UK Example of rainwater harvesting tank and overflow to small soakaway ANTAGWR0909 1 A
A: Infiltration trench with surface inflow (for good quality run-off) Surface run-off Trench, 1 to 3m deep filled with clean stone or rubble Filter fabric lines sides to prevent soil entering trench B: Infiltration trench with perforated pipe and capacity for pre-treatment Clean stone or rubble Filter fabric Inflow: run-off from road, swale or gutter down pipe Perforated pipe (not essential) Standard curb inlet Permeable filter fabric Infiltration Sediment trap, optional hydrocarbon interceptor Revision and compilation notes Date Registered Office:,,. UK Examples of infiltration trenches ANTAGWR0909 2 A
Top View Riprap settling basin and level spreader Embankment Flat basin floor with dense grass turf Inlet Side View Retained stormwater run-off Embankment Inlet Infiltration Revision and compilation notes Date Registered Office:,,. UK Example of an infiltration basin for storm run-off ANTAGWR0909 3 A
Swale slopes less than 5%, as close to zero as drainage will permit Surface run-off Side slopes 3:1 or less Small weir Surface run-off Weep hole Stone prevents downstream scour Infiltration Revision and compilation notes Date Registered Office:,,. UK Example of a grassed swale ANTAGWR0909 4 A
A: Recharge well or 'suckwell' for storm drainage Inflow, run-off from road 0.5m Precast riser ring Floating material retained Sediment 1-2m Steel ring beam B: Recharge well or 'suckwell' to enhance infiltration in a basin Stone Inspection manhole Precast cap Rip rap Screened inflow 1.0m Possible clogging layer 1-2m Precast riser ring Steel ring beam 10-30m Revision and compilation notes Date Registered Office:,,. UK Examples of recharge wells ANTAGWR0909 5 A
Concrete discharge chamber Re use (Irrigation) Day 1 Inflow pipe Inspection lid Day 75 Permeable filter fabric Clean stone or rubble Infiltration through in situ soil Slotted pipe Day 5 Groundwater Table Day 0 Revision and compilation notes Date Registered Office:,,. UK Example of infiltration gallery to recharge treated waste water 23.10.2009 JS/EMB CC NTS ANTAGWR0909 6 A
Plan Slope Trench Bund Spacing approximately 30x width Section Bund, vegetated for stability Depth <0.5m Width <0.5m Infiltration Revision and compilation notes Date Registered Office:,,. UK Example layout of contour trenching with bunds ANTAGWR0909 7 A
Stone pitching on upstream face Previous locally sourced fill Maximum water level Side slopes 2.5:1 (h:v) 0.5m freeboard Level of spillway Boulder/concrete apron 0.25m deep Stream bed c.5m Masonry core Key trench, 0.6m wide in hard rock, 1.2m wide in soft rock Revision and compilation notes Date Registered Office:,,. UK Example of an earth check dam with a masonry core ANTAGWR0909 8 A
A: For small stream of relatively low sediment load Offtake weir Large bar screen Removal of floating material Overflow weir Outflow to small canal Stream bed Intake pipe Settlement B: Diversion with earth bund across stream bed Stream bed Large floods pass over spillway Diversion canal Settlement 2-5m Stream bed Revision and compilation notes Date Registered Office:,,. UK Examples of simple stream offtake/diversion structures ANTAGWR0909 9 A