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The Solomon Islands is a country in the South Pacific Ocean, lying to the east of Papua New Guinea and northwest of Vanuatu, composed of around 1000 islands of which approximately 350 are inhabited. The country has total area of 28 900 km². The major islands are Guadalcanal (5 120 km²) where the capital Honiara is located, Malaita (4 310 km²), Makira (San Cristobal) (3 190 km²), Santa Isabel (3 000 km²), Choiseul (2 970 km²) and New Georgia (2 037 km²). These islands vary in length from 145 to 190 km and in width from 35 to 50 km. The remaining are smaller islands and atolls (SOPAC, 2007; Sullivan and Guglielmi, 2007). The country is divided into ten administrative areas: nine provinces and the capital city Honiara.
The agricultural area, which is the sum of arable land, permanent crops, and permanent meadows and pasture, is estimated at 108 000 ha, which is 4 percent of the total area of the country. In 2013, the total physical cultivated area was estimated at 100 000 ha, of which 20 percent (20 000 ha) consisted of temporary crops and 80 percent (80 000 ha) of permanent crops (Table 1).
The islands vary considerably, from a small tiny atoll island to a high mountainous heavily dense rain forested island; the highest point on the islands is the Mount Popomanaseu at 2 310 m on the island of Guadalcanal. Flat land is restricted to the coasts and is of limited extent, except in the north-central part of Guadalcanal, referred to as the Guadalcanal Plains. Approximately 80-85 percent of the total land area are natural forest (SOPAC, 2007).
The Solomon Islands have a tropical monsoon climate with a relatively high and uniform temperature, high humidity and abundant rainfall. Temperatures fluctuate between 25ºC to 32ºC during the day and some degrees less during the night. The mean annual rainfall is estimated at about 3 000 mm, ranging from 1 500 to 5 000 mm and with a total exceeding 8 000 mm on high peaks. This wide variation depends on topography, latitude and orientation of the islands to prevailing winds. The dry season is from April to November and the wetter north-west monsoon season from November to April, with a tendency of reduced rainfall during February when the equatorial trough is normally furthest south (SOPAC, 2007; Sullivan and Guglielmi, 2007; Wairiu and Powell, 2006).
In 2015, the total population was about 583 600, of which around 78 percent was rural (Table 1). Population density is 20 inhabitants/km². The average annual population growth rate in the 2005-2015 period has been estimated at 2.2 percent. Approximately 350 islands are inhabited including the six main islands of Guadalcanal, Malaita, Makira, Santa Isabel, Choiseul and New Georgia (Wairiu and Powell, 2006).
In 2014, the Human Development Index (HDI) ranks the Solomon Islands 156 among 188 countries. Life expectancy is 68 years and the under-five mortality is 28 per 1000 births, both progressing from 60 years and 37 per 1000 in the 1990s. With no significant distinction between boys and girls, around 81 percent of the children in 2007 were enrolled in primary education, but only 31 percent for secondary education (WB, 2015). In 2015, 81 percent of the total population had access to improved water sources (93 and 77 percent in urban and rural areas respectively) and 30 percent of the total population had access to improved sanitation (81 and 15 percent in urban and rural areas respectively) (JMP, 2015).
In 2014, the gross domestic product (GDP) was US$ 1 158 million. In 2006, agriculture accounted for 36 percent of GDP, while in 1996 it accounted for 41 percent.
The Solomon Islands is an agriculturally based society. Agriculture commodities have been the major exports from the Solomon Islands since the country attained its independence. Coconut products are traditionally the main agricultural output. The main industries in the country are copra, timber, palm oil, fish, cocoa and beef cattle. Main exports are timber, fish, copra, cocoa and palm oil/kernel.
The country is relatively rich in mineral and forest resources. The logging industry is the dominant sector within the economy but uncontrolled and destructive activities have resulted in serious problems with irreparable damage to the environment, the forests and the country’s economic future. However, only about 10 percent of the forested area is considered suitable for commercial exploitation. The non-commercial areas are located on steeply sloping land or scattered across many small islands and are presently not economically feasible to log. The government has undertaken some steps to avoid illegal forestry (SOPAC, 2007; Sullivan and Guglielmi, 2007).
Freshwater availability varies considerably across the archipelago. On the large volcanic islands, water resources with river systems are abundant due to the mountainous topography and weather conditions. The low coral atolls and islets have no perennial surface water resources and rely on rainwater and thin fresh groundwater lenses (ISF-UTS, 2011; SOPAC, 2007).
The longest river is Lunga river on Guadalcanal Island with a catchment area of 377 km² (Sullivan and Guglielmi, 2007). Aquifers on the islands are small and depend mainly on precipitation for recharge (ISF-UTS, 2011).
Total renewable surface water resources are estimated at 44 700 million m³/year. The renewable groundwater resources are estimated at about 11 920 million m³/year, which are considered to be drained entirely by the surface water network (overlap). The total annual renewable water resources in the country are thus estimated at 44 700 million m³ (Table 2).
Lake Tegano on Rennell island is the largest lake in the country, and consists of a mixture of brackish freshwater and salt water.
There are no important dams and there is limited hydropower development in Solomon Islands. There is only one single micro-hydropower plant (150kW) and about a dozen pico-hydropower installations in the rural areas which can sustain a small community. There is substantial potential for hydropower from water resources on at least seven islands but little effort has been made so far to evaluate the resource (SOPAC, 2007; Wairiu and Powell, 2006).
Drinking and household use in both rural villages and in urban centres account for the largest water withdrawal in the country. There is limited agricultural water demand because most crops are rainfed. The industrial sector withdraws water for fish processing cannery, palm oil factory, mining operations and some small manufacturing industries. Although the demands for industry are still relatively small there is considerable potential for future growth (SOPAC, 2007).
On the larger islands, surface water in the form of streams, springs or rivers is the main source of drinking water. Some communities on the higher volcanic islands also use groundwater for domestic purposes. The major users of groundwater resources are the capital city Honiara and the Guadalcanal Plains. Approximately 20-30 percent of Honiara water supply is sourced from groundwater. The Guadalcanal Plains on the northeast coast of Guadalcanal have abundant potential for groundwater. In areas where surface water supply is not available for farming, groundwater is used if available.
In urban areas, piped water accounts for 75 percent of total water withdrawal, rain water tanks account for 22 percent, bore hole/spring/wells account for 1 percent, and other sources account for 2 percent.
On the small atoll islands and islets where water is scarce, rainwater is collected for drinking and brackish water from shallow hand-dug wells is utilized for most of their other domestic needs. Dug wells have been used to collect water but due to its relative poor quality (saline) rainwater is used for drinking and cooking. (ISF-UTS, 2011; SOPAC, 2007).
Desalination of water is limited, except for private resorts and boats mainly for tourists.
In 2007, rice was the only crop using irrigated agriculture in the Solomon Islands, all other crops were rainfed. There were six irrigated rice projects with a total area of 35.4 ha (Table 4) (SOPAC, 2007):
The National Rural Rice Development Programme, started in 2006, aims to establish a total of 150 ha of irrigated rice fields throughout the country in five years. Plans are also underway to rehabilitate the 200 ha Metapona Rice Project in the Guadalcanal plain (SOPAC, 2007). It is not known whether these areas have been developed already and whether the schemes are functional. The agricultural developments of Guadalcanal plains have shown the potential for irrigation especially in the small holder rice farming activities.
Women are the main collectors of water for domestic uses in Solomon Islands. As a result, they are the ones who are mostly affected by water sector developments, especially in the rural areas. Where communities have been relocated due to logging or mining, water sources are often far away, increasing the burden of work for women. Provision of improved water and wastewater services in the rural areas benefits women as they are able to do other important activities without the constraints of water collection (ISF-UTS, 2011; SOPAC, 2007).
The main institutions related to water resources management are (SOPAC, 2007; Nexus, 2015):
The Pacific Islands Applied Geoscience Commission (SOPAC) is an intergovernmental, regional organization including 18 Pacific island countries and territories, as well as Australia and New Zealand. SOPAC’s work is carried out through its Secretariat, based in Suva (Fiji). While the initial focus of its work was on marine mapping and geosciences, during recent years other scopes such as hazard assessment and risk management, environmental vulnerability, oceanography, energy, water and sanitation have been included.
In Solomon Islands there is an increasing demand for water which therefore needs proper management and development. In urban areas population has drastically increased over the years with limited expansion in the water supply sector. Similarly, rural populations have experienced deterioration in freshwater quality due to logging and agricultural practices.
Successive governments in the country have prioritized the water sector, especially provision of safe and reliable water supplies to rural communities and urban centres. However, there was little emphasis on water resources management and infrastructure rehabilitation and development of water and wastewater services.
In 2004, the United Nations Development Programme (UNDP) and Global Environment Facility (GEF) signed an agreement with SOPAC to develop an innovative programme on Sustainable Integrated Water Resources Management (IWRM) for Pacific Island countries. This programme supports the Pacific Small Island Developing States (SIDS) in the implementation of the Pacific Regional Action Plan that addresses sustainable water management (SOPAC, 2007).
Water tariffs for the services of SIWA must take into account cost recovery to ensure reliability and sustainability of the services it provides and must be affordable to all users. SIWA is currently investigating possibilities to reduce energy costs. Rural water supply and sanitation is subsidized through government funding and overseas donors, mainly Australia, New Zealand, European Union, Canada, Japan and China. (SOPAC, 2007).
The Solomon Island’s Draft National Water Policy (NWP), developed under the EU-funded Solomon Island’s Water Governance Project, addresses water resource management, water supply and sanitation. It sets out a vision for universal coverage of water of adequate quality and quantity (ISF-UTS, 2011).
The legislation in the country related to water resource management includes (SOPAC, 2007):
There is evidence that the quantity and quality of freshwater is in decline but there is a lack of adequate reliable hydrological data and funds to collect detailed data. Furthermore, common practices such as logging and the traditional slash and burn method of farming have gradually destroyed the rivers and streams, threatening key catchment areas. Aquifers are also highly vulnerable to the effects of human-caused contamination as well as sea level rise and saltwater intrusion related to climate change (ISF-UTS, 201; SOPAC, 2007; Sullivan and Guglielmi, 2007). Salinization of groundwater is increasing in most coastal villages and atoll islands due to ingression of seawater during extreme weather events or as an ongoing trend (SPREP, 2015).
The mining activities on Guadalcanal pollutes nearby rivers and catchment areas. As well, the commercial palm oil development on Guadalcanal plains has a high usage of chemicals and fertilizers that affect groundwater and surface water sources (SOPAC, 2007).
Solomon Islands are vulnerable to major droughts and flooding, both of which are expected to be strongly exacerbated by climate change which will affect rainwater patterns. In 1986 water completely inundated a major part of Guadalcanal Plain, claiming more than 100 lives. In 1995 parts of Solomon Islands experienced too little rain causing severe water shortages (ISF-UTS, 2011; SOPAC, 2007).
Climate change is expected to be characterized by wetter wet seasons and dryer dry seasons (SIWA, 2013).
The country needs an integrated approach to improved water management in order to address threats to the water resources in the near future (SOPAC, 2007).
The protection of water resources may be achieved through (MMERE, 2007):
Wairiu, M. and Powell, B. 2006. Situation analysis report. Solomon Islands. International Water Centre/ Australian Water Research Facility.
ISF-UTS. 2011. Solomon Islands water, sanitation and hygiene (WASH) sector brief. Prepared for AusAID by the Institute for Sustainable Futures, University of Technology Sydney, October 2011.
JMP. 2015. Progress on drinking water and sanitation – 2015 Update and MDG Assessment. WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation.
MMERE. 2007. Sustainable integrated water resources and wastewater management project in the Pacific Island countries. Demonstration project proposal for Solomon Islands. Managing Honiara city water supply and reducing pollution through IWRM approaches. Ministry of Mines, Energy and Rural Electrification.
Nexus. 2015. Find Water and Sanitation expertise in Solomon Islands. Nexus Strategic Partnerships Limited.
SIWA. 2013. The Solomon water development plan, 2013-2015. The “Two-Year Plan”. Solomon Islands Water Authority.
SOPAC. 2007. National integrated water resource management diagnostic report. Solomon Islands. The Pacific Islands Applied Geoscience Commission.
SOPAC. 2015. Website of SOPAC. Pacific Islands Applied Geoscience Commission.
SPREP. 2015. PEIN Country profile and virtual environment library. Solomon Islands. Secretariat of the Pacific Regional Environment Programme.
Sullivan, C.A. and Guglielmi, F. 2007. Pacific Island water resources: An overview of East Timor, Kiribati, Solomon Islands, Tuvalu and Vanuatu. Oxford University, Dec 2007.
UNDP. 2015. Human Development Reports: Data. United Nations Development Programme. New York.
World Bank. 2015. World Development Indicators. World DataBank. World Bank. Washington.
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