The volunteers of Save Our Seine started the hydromertic program by collecting water levels in early April 2009 and river flows later in April.
Outflow from the Seine River Siphon was measured April 19 and May 4. These pictures illustrate the use of a Price Current Meter to measure water velocities at multiple locations in order to calculate the river flow. Since April volunteers have been collecting daily water level measurements at a number of locations.
Since the floodway began operating in April the siphon inlet has been submerged resulting in the high flow through the siphon. The relatively high siphon outflow combined with local snowmelt runoff resulted in high water levels during April. Since May 3 the water level in the Floodway has dropped causing the flow through the siphon to drop. Local snowmelt runoff has also stopped. Water levels on the Seine River have dropped sharply over this period, especially upstream of Fermor.
Although water levels on the Seine River downstream of Fermor have dropped recently they remain relatively high due to high levels on the Red River. The Red River causes a backwater effect on this part of the Seine River.
Marc and Mike preparing to measure the flow of the Seine near the Siphon outlet just inside the floodway
Mike holding the Price Current Meter
Mike and Marc calculating the flow of the Seine