Foul flush diverter Screened - Rainwater Harvesting Toolbox RWH... · Clean stone or rubble fill...

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 810093info@gwp.uk.comwww.gwp.uk.com

telfax

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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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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 810093info@gwp.uk.comwww.gwp.uk.com

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