YSI 556 MPS
pH:
Temperature (C):
Dissolved Oxygen (mg/L):
Conductivity (µS):
Hach 2100 Q
Turbidity (NTU):
Whirl-pak
Bacteria:
Van Dorn
This horizontal water sampling device is Messenger operated. They are lowered into a body of water in the open position. When the bottle reaches a desired depth, a weight, or Messenger, is slid down the line until it hits a trigger device on the bottle, known as a trip head. This causes the bottle to close. The Van Dorn Beta Bottle is designed for trace metal and chemical sampling. They have an excellent track trecord in a variety of field conditions. They feature a stainless steel trip head mechanism for durability and high performance. They also feature a nylon safety line connecting the end seals, so if the latex tubing breaks, it is less likely that the end seals will be lost. When tripped by a mesenger, the end seals snap tightly onto each end of the cylinder, producing an almost leak proof seal. A small amount of sample is always lost until a slight vacuum forms inside the sampler as it is lifted out of the water. The beta end seals are made of rigid, inert, white ASA plastic. The bottle ends are machined to fit foam silicone gaskets which are attached to the end seals. Amber latex tubing is used to close the bottle because it leaches foewer contaminants than the black metal. Since there are no metal parts to touch the sample, the Beta Bottle is excellent for trace metal sampling at least to the ng/L level.
Flow Analysis:
FP101-FP201 Global Flow Probe
Average Velocity (ft/sec):
Velocities are greater in the center of the flow and less near the bottom and sides of the channel. The water surges in velocity with time. In a smooth running stream, the velocity at a specific point can easily vary 1-2 feet per second over the period of a minute. This pulsating or surging of flow should be averaged to obtain an accurate average flow reading (leave the probe in the flow through a series of flow surges).
For larger streams and rivers where the Flow Probe can't easily be moved throughout the flow, divide the stream into subsections 2-3 feet wide. Run a measuring tape across the stream for reference. Obtain a vertical flow profile at the center of each subsection: zero the averaging function and move the Flow Probe vertically from the surface to the bottom, up and down, slowly and smoothly for 20-40 seconds to obtain a good average. The average velocity (obtained with the Flow Probe) times the area of the subsection equals the flow for the subsection (Q=VxA). Once the flow of each subsection is obtained, add all of the subsection flows to obtain the Total Streamflow.
