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A Horizontal Intragravel Pipe for Sampling Water Quality in Salmonid Spawning Gravel
Author(s) -
Hoffman Ray J.
Publication year - 1986
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8659(1986)6<445:ahipfs>2.0.co;2
Subject(s) - perpendicular , tube (container) , water pipe , peristaltic pump , geology , water flow , water quality , materials science , geotechnical engineering , hydrology (agriculture) , environmental science , composite material , geometry , engineering , mechanical engineering , inlet , biology , ecology , mathematics , geomorphology
A new sampler, the horizontal intragravel pipe, was developed for collecting samples of intragravel water in salmonid spawning gravel. The device is a 2.54 × 76.2‐cm length of slotted polyvinyl chloride pipe that is buried perpendicular to flow in the streambed. The slots (about 320/pipe) through which the intragravel water flows were cut perpendicular to the long axis of the pipe. Each slot is 1.9 cm long by 0.15 mm wide. A rigid plastic tube (0.64 cm inside diameter) centered axially within the intragravel pipe is perforated with three 3.2‐mm holes equally spaced along its length to distribute equally the effect of pumping. The interior tube is connected by Tygon tubing to a peristaltic pump on a platform above the water surface. Intragravel water is pumped to containers for on‐site measurement of dissolved oxygen, pH, and specific conductance, and for determination of other constituents in the laboratory. The principal advantages of a horizontal intragravel pipe are that a substantial quantity of water can be withdrawn for analysis, and samples of water may be integrated across an artificial redd.