The Riviera Grise drains water from the Cul-de-Sac watershed, Haiti, which covers most of the rural areas along the flood plains and areas that extend into steep hillsides. It also covers urban areas of Port-Au-Prince, the capital city of Haiti. The river drains approximately 290 km 2 of watershed area and attains a maximum flow 475 m 3 /s during its peak flow and a minimum flow 0.3 m 3 /s during drought conditions (US COE, 1999). The

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