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Clean stoneor rubble fill
Inspection cover
Possible localdrainagethrough screen
Drain
Perforated silt trap
DrainScreenedoverflow
Inflow pipe
Foul flush diverter
Screenedintake
Manholecover
Stone
Screenedoutlet
Drainage ditch
Drainage sump
Bottom sloped
SealMaximumwater level
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Example of rainwater harvesting tank and overflow tosmall soakaway
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 1 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
Surface run-off
Filter fabric lines sides toprevent soil entering trench
Trench, 1 to3m deep filledwith cleanstone or rubble
Infiltration
Permeablefilter fabric
Perforated pipe (not essential)
Clean stoneor rubble Filter fabric
Sediment trap,optionalhydrocarboninterceptor
Standardcurb inlet
Inflow: run-off fromroad, swale or gutterdown pipe
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Examples of infiltration trenches
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 2 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
A: Infiltration trench with surface inflow (for good quality run-off)
B: Infiltration trench with perforated pipe and capacity for pre-treatment
Emba
nkm
ent
Flat basin floor withdense grass turf
Inlet
Riprap settling basinand level spreader
Retainedstormwater
run-off
Embankment Inlet
Infiltration
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Example of an infiltration basin for storm run-off
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 3 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
Top View
Side View
Stone preventsdownstream scour
Weep hole
Surfacerun-off
Swale slopes less than 5%,as close to zero as drainagewill permit
Side slopes3:1 or less
Small weir
Surface run-off
Infiltration
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Example of a grassed swale
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 4 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
0.5m
Precast capInspectionmanhole
Precast riser ring
Steel ringbeam
1-2m
Inflow, run-offfrom road
Floatingmaterialretained
Sediment
1-2m
10-30m
Precast riser ring
Steel ringbeam
Stone
Rip rapScreenedinflow 1.0m
Possibleclogging
layer
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Examples of recharge wells
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 5 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
A: Recharge well or 'suckwell' for storm drainage
B: Recharge well or 'suckwell' to enhance infiltration in a basin
Day 1
Day 75
Groundwater Table
Slotted pipePermeablefilter fabric
Cleanstone orrubble
Day 5
Re use(Irrigation)
Inspection lid
Inflow pipe
Concrete dischargechamber
Infiltration throughin situ soil
Day 0
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Example of infiltration gallery to recharge treated wastewater
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/EMB CC NTS
ANTAGWR0909 6 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
Trench
Bund
Slope
Spacingapproximately30x width
Depth <0.5m
Width <0.5m
Bund, vegetatedfor stability
Infiltration
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Example layout of contour trenching with bunds
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 7 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
Plan
Section
Maximum water level
Stream bed
Side slopes2.5:1 (h:v)
Level ofspillway
0.5m freeboard
Stone pitching onupstream face
Previous locally sourced fill
c.5m
Boulder/concreteapron 0.25m deep
Masonry coreKey trench, 0.6m widein hard rock, 1.2mwide in soft rock
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Example of an earth check dam with a masonry core
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 8 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
Outflow tosmall canal
Intake pipe
Settlement
Stream bed
Offtake weir Large barscreen
Removal of floatingmaterial
Diversion canal
Large floods passover spillway
Stream bed
2-5m
Stream bed
Settlement
Overflow weir
Version Revision and compilation notes Date
A Issued with report 23.10.2009
Client
Project
Date Drawn Checked Scale
VersionDrawing NoDrawing Ref
Caribbean Environmental Health Institute
Examples of simple stream offtake/diversion structures
Antigua and Barbuda Rainwater Harvesting forGroundwater Recharge
23.10.2009 JS/LS CC NTS
ANTAGWR0909 9 A
+44 (0)1608 810374+44 (0)1608 [email protected]
telfax
e-mailweb
Upton HouseMarket Street, CharlburyOxfordshire OX7 3PJUnited Kingdom
GWP Consultants LLP. Registered No. OC326183.Registered Office: Upton House, Market Street, Charlbury, Oxfordshire OX7 3PJ. UK
A: For small stream of relatively low sediment load
B: Diversion with earth bund across stream bed
