levels were operationally monitored, farming adjustments and management measures trained and verified on the effec- tiveness in reducing health risks. In many countries, farmers prefer wastewater for irrigation due to economic benefits in fertilizer savings. Typical concentrations of nutrients in treat- ed wastewater effluent from conventional sewage treatment processes are as follows: 50 mg/litre of nitrogen; 10 mg/litre of phosphorus; and 30 mg/litre of potassium. Assuming an


application rate of 5 000 m3/ha/year, the fertilizer contribu- tion of this effluent would be 250 kg/ha/year of nitrogen, 50 kg/ha/year of phosphorus and 150 kg/ha/year of potassium. Thus, the effluent would supply all of the nitrogen and much of the phosphorus and potassium normally required for agri- cultural crop production. Other valuable micro-nutrients and the organic matter contained in the effluent would also pro- vide benefits.


Community-based project in Cambodia addresses water supply and wastewater treatment challenges


The project was initiated under the Joint Communiqué of the UNDP GEF Small Grants Programme and PEMSEA. More than 600 families are located in Stung Hav. Most of the families derive their income from fishing, with supplemental income derived from agriculture. The Reservoir Utilization and Community-based Sus- tainable Ecotourism Development project was implemented to: (1) rehabilitate a 5.9-hectare water reservoir to abate the impact of climate change on water levels and recharge the dried wells in the surrounding area; and (2) provide a water source for other supple- mental livelihood activities, particularly agricultural production.


The project resulted in the rehabilitation of a community reser- voir with holding capacity of 40 550 m3. Community members


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estimated monthly savings of up to US$34 on water-use fees. The rehabilitated reservoir also serves to recharge groundwater in nearby water wells, thereby reducing the time and effort by family members – mostly women and children – in accessing wa- ter for household use.


A wastewater garden was created as a natural water treatment system to prevent water contamination from household waste- water discharge for irrigation. Planting of about 380 trees around the reservoir was also done to prevent soil erosion, maintain the reservoir’s water-holding capacity and improve the landscape.


(Source: Personal communication, Adrian Ross, PEMSEA, 2010)


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