Case Studies

Discharge Monitoring in a Tidally Affected River with the SonTek-SL in Southern Malaysia

Malaysia Estuary In 2011 a series of gauging stations was established along the Johor River which measured river water level and velocity to gain a better understanding of the existing river flows. The Johor River is an important source of water for several water treatment plants. However during high tides and in dry seasons, a salt water wedge pushes upstream affecting water quality and thus water supply.

Paper: Discharge and Bathymetric Data Collection of Sinar Mas Forestry Plantantation Canals in Indonesia

Water management in the Sinar Mas Forestry plantations presents an immense amount of challenges. With over 2.6 million hectares of concession areas to manage, a comprehensive and dynamic water management plan is essential. For example, during the annual dry season, water table management is critical to prevent peat fires and for peatland forest conservation. However during the wet season, attention is switched to flood management at low elevation areas.

App Note: Clever Kayak Rig Navigates Tricky Bathmetry Challenge

It was a small lake, but a big challenge. Covering about 43 acres (17 ha), the lake is at the center of the Lake Forest subdivision in Daphne, Alabama and is completely surrounded by private property. Bret Webb, associate professor of Civil, Coastal and Environmental Engineering at the University of South Alabama, was starting a month-long study of sedimentation in the lake to help authorities evaluate flood storage capacity and potential restoration activities, but he was having trouble reaching the water. There was no public boat access, and thick vegetation prevented surveying elevations above the water level.

Clearer Views - Flow Data Will Help Springs Recovery

Silver Springs—a network of two dozen or more springs in central Florida—bubble up through central Florida’s Karst formations, limestone beds that have been carved by acidic groundwater and rain into baroque networks of caves, channels, domes and tunnels. Channels in the matrix flow with underground rivers and provide quick conduits between surface water and shallow groundwater. As domes collapse and sinkholes form, ancient paths are rerouted beneath the surface.

Inuit Hunters Use CastAway-CTD to Gather Data Under Hudson Bay Ice

The hunters recognized the changes. A shot seal would usually float, buoyed by its blubber atop the dense saltwater of Canada’s Hudson Bay. Now the seals were sinking below the surface before the hunters could reach them. Polynyas, the open patches of sea surrounded by ice, were freezing over with brittle, clear ice, often with little warning. Beluga whales were being trapped beneath the floes, cut off from their surfacing holes. Arctic eiders, the diving ducks whose down is a source of warmth and commerce for the Inuit, were trapped on the ice, dying like flies.

App Note: FlowTracker Helps Nepal River Expedition

The Bagmati is both a sacred river and a city sewer, running through Nepal’s capital city of Kathmandu before heading into the mountains and over the Indian border. Since 2013, thousands of volunteers have gathered along the Bagmati for weekly river clean-ups on Saturday mornings, and the 100th cleaning event on April 11, 2015 drew more than 100,000 locals to the river’s banks.

App Note: FlowTracker Used in Palenque Hydro-Archaeology Project

The Palenque Hydro-Archaeology Project (PHAP) is moving forward in its search for a better understanding of the site’s hydrology. PhD Candidate, Kirk French, and his professor from Pennsylvania State University, Dr. Christopher Duffy, arrived at Palenque in early May, with goals to explore Palenque’s watershed and scout locations for the installation of more stream sensors. Additionally, the team wished to test the viability of using SonTek/YSI FlowTracker Handheld ADV on Palenque’s many waterways.
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