Nauru Technical Report, Rainwater Harvesting
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EU-SOPAC (EDF9) Project Report 80 Reducing Vulnerability of Pacific ACP States NAURU TECHNICAL REPORT RAINWATER HARVESTING: ASSET CONDITION SURVEY OF DOMESTIC INFRASTRUCTURE 13th February to 23rd February 2007 Plastic water storage tank emplaced partially below ground level, Buada, Nauru. EU-SOPAC Reducing Vulnerability of Pacific ACP States Nauru – Rainwater Harvesting Asset Survey – 2 Compiled by: Mr Stephen K. Booth Ms Elizabeth Lomani-Whippy Ms Arieta Navatoga-Sokota Ms Vilisi Tokalauvere SOPAC Secretariat August 2007 IMPORTANT NOTICE This document has been produced with the financial assistance of the European Community; however, the views expressed herein must never be taken to reflect the official opinion of the European Community. For more copies of this report, apply to the SOPAC Secretariat at the address below: PACIFIC ISLANDS APPLIED GEOSCIENCE COMMISSION c/o SOPAC Secretariat Private Mail Bag GPO, Suva FIJI ISLANDS http://www.sopac.org Phone: +679 338 1377 Fax: +679 337 0040 [email protected] [EU-SOPAC Project Report 80 – Booth & others] EU-SOPAC Reducing Vulnerability of Pacific ACP States Nauru – Rainwater Harvesting Asset Survey – 3 CONTENTS EXECUTIVE SUMMARY ..............................................................................................................5 List of Acronyms............................................................................................................................6 1. INTRODUCTION....................................................................................................................7 1.1 Background...................................................................................................................7 1.2 Policy Setting ................................................................................................................7 1.3 Rainwater Harvesting....................................................................................................8 2. OBJECTIVE .........................................................................................................................10 3. FIELDWORK SURVEY METHODOLOGY...........................................................................11 3.1 Satellite Imagery .........................................................................................................11 3.2 Global Positioning Systems ........................................................................................20 3.3 Geographic Information Systems & Data Processing.................................................23 3.4 Field Survey Personnel...............................................................................................23 3.5 Field Survey Techniques ............................................................................................23 3.6 Nauru Geospatial Content Management System .......................................................25 4. ASSET CONDITION SURVEY RESULTS...........................................................................27 4.1 Catchment Systems – Roofing ...................................................................................27 4.2 Transmission Systems – Guttering & Downpipes.......................................................30 4.3 Storage Systems – Tanks & Cisterns .........................................................................33 5 POPULATION DYNAMICS AND DOMESTIC WATER DEMAND.......................................39 5.1 Population Size...........................................................................................................39 5.2 Population Mortality ....................................................................................................40 5.3 Household Size...........................................................................................................41 5.4 Domestic Water Demand............................................................................................42 6 CONCLUSIONS AND RECOMMENDATIONS....................................................................43 REFERENCES ...........................................................................................................................46 ANNEXES A Govt of Japan – Grand Assistance for Grassroots Human Security Projects (GGP).............48 B RoN letter dated 26th July 2006 (Hon D. Adeang to EU Delegation, Suva), endorsing the use of uncommitted B-Envelope funds for disaster preparedness by addressing drought risk .............................................................................................................................50 C Summary Mission Itinerary .....................................................................................................51 D GPS Data Dictionary...............................................................................................................55 E Example of field survey data collection form...........................................................................58 F Full tabulations of all field data collected ................................................................................59 [EU-SOPAC Project Report 80 – Booth & others] SOPAC-EDF9 Reducing Vulnerability of Pacific ACP States Nauru – Rainwater Harvesting Asset Survey – 4 LIST OF FIGURES 1 QuickBird (2006) Satellite Image of Nauru................................................................................11 2 Surveyed properties & reference numbers – Yaren District......................................................12 3 Surveyed properties & reference numbers – Buada (South) District ........................................13 4 Surveyed properties & reference numbers – Buada (North) District.........................................14 5 Surveyed properties & reference numbers – Anibare & Ijuw Districts ......................................15 6 Surveyed properties & reference numbers – Anibare District ...................................................16 7 Surveyed properties & reference numbers – Meneng District ..................................................17 8 Surveyed properties & reference numbers – Meneng District ..................................................18 9 Surveyed properties & reference numbers – Meneng & Yaren Districts...................................19 10 GeoXM hand-held GPS.............................................................................................................20 11 Data Dictionary editor created in Pathfinder Office ...................................................................20 12 Trimble 4600LS base station set-up over RM2 at the Nauru CGPS.........................................21 13 Location sketch of Nauru CGPS and RM2................................................................................22 14 Spatial coverage achieved by survey teams .............................................................................24 15 Types of roofing materials .........................................................................................................27 16 Condition of roofing materials....................................................................................................28 17 Roofing slopes ...........................................................................................................................29 18 Vegetation Overhang.................................................................................................................30 19 Gutter materials .........................................................................................................................31 20 Gutter condition .........................................................................................................................32 21 Properties with and without downpipes .....................................................................................33 22 Tank materials ...........................................................................................................................34 23 Properties with and without storage tanks.................................................................................35 24 Tank conditions..........................................................................................................................36 25 Tank abstraction methods .........................................................................................................37 26 Alternative supply methods .......................................................................................................38 27 Alternative supply well, Buada District.......................................................................................38 28 Future population trends according to three projection variants (from 2002 Census) ..............40 LIST OF TABLES 1 Nauru CGPS Reference Data ...................................................................................................21 2 Total number of houses and tanks surveyed by teams A & B ..................................................25 3 Types of roofing materials .........................................................................................................27 4 Condition of roofing materials....................................................................................................28 5 Pitch (or slope) of roofs .............................................................................................................29 6 Vegetation Overhang.................................................................................................................29