List of Hydrological Instruments

9. SUSPENDED SEDIMENT SAMPLER (USDH-48 OR 59).

This depth integrating type suspended sediment sampler is used to collect the sediment samples. The sampler consists of a streamlined metal body provided with tail fins to permit alignment in the flow direction. The container for sediment-water mixture is usually a bottle housed in the metal body capping after the sample has been obtained seals the bottle. This sampler is used in shallow streams when the product of the depth (in feet) and velocity (in feet/sec) does not exceed approx. 10. This sampler is used with wadding rod suspension.

Applications : • 13" streamlined aluminum casting partially encloses a pint sample container. • Sampler is supplied with one 1/4" calibrated yellow nylon nozzle. • Wading rod & bottles are sold separately (see accessories).

10. BED MATERIAL SAMPLER

A total of 468 bed material samples were collected at cross sections of the sand bed of the South Saskatchewan River at Saskatoon to assess the random and systematic errors in the results from four commonly used samplers. Statistically significant differences in particle size distribution occur between the results obtained from different samplers at the same location, in part due to variability in retention of the small particles.

Applications : The differences are greatest in silty sand and least in well-sorted, medium sand. The precision of results from repetitive samples at the same location using the same sampler depends on both the sampler and the composition of the bed material. Except in well-sorted, medium sand, a single sample at a vertical is inadequate to determine the particle size of a given size fraction to within 10% with a probability of error of 0.1. In some cases 10 or more samples may be required.

11. Flow Probe.

The Flow Probe is a highly accurate water velocity instrument for measuring flows in open channels and partially filled pipes. The water velocity probe consists of a protected water turbo prop positive displacement sensor coupled with an expandable probe handle ending in a digital readout display. The water flow meter incorporates true velocity averaging for the most accurate flow measurements. The Flow Probe is ideal for storm water runoff studies, sewer flow measurements, measuring flows in rivers and streams, and monitoring water velocity in ditches and canals.

12. Guelph Permeameter.

The Guelph Permeameter is used to obtain accurate measurements of hydraulic conductivity, soil sorbtivity and soil matrix flux potential. These three factors govern how liquid move through an unsaturated soil profile. This lightweight instrument is portable, reliable and simple to use. Depending on the soil type, accurate results can be obtained in 1 to 2 hours using only 2.5 litres of water.

13. Mini Disk Infiltrometer.

The Mini Disk Infiltrometer is a quick way to test unsaturated hydraulic conductivity and infiltration rates. It's ideal for irrigation system design, classroom instruction, erosion hazard evaluation, burn severity studies, and many other applications. Small, compact, and simple, the Mini Disk Infiltrometer is a true field instrument. It can be tossed into a backpack with a bottle of water. Adjustable suction and a porous stainless steel contact plate assure a reliable soil unsaturated hydraulic conductivity measurement.

14. Portable Water Level Indicator (Sounder).

The water level Indicator (Sounder) is designed for water level measurements in wells and deep bore wells. It has a steel probe connected with the flat permanently marked polyethylene tape, having markings. The probe can easily be inserted in a gap of 2 centimeters. The wire is winded on a well balanced reel/spool, made of PVC having a handle to fasten the wire. The probe is lowered into the stream or well or bore well, as the tip of the probe touches the surface of the water; an in-built electronic circuit indicates contact with water by sounding a beep. Depth is read from the attached cable having graduations at every m/cm/mm.

15. Point Source Bailer.

The Point Source Bailer is stainless steel and has dual ball valves, top and bottom. This prevents a sample collected at a discrete depth from mixing with water from other depths during retrieval. It is a simple and cost effective device for aquifer profiling, and collecting samples from distinct levels. Purging and disposal of purge water can be avoided. The miniature 0.5" (12.7 mm) diameter model is ideal for use in narrow tubes and direct push devices.