Pre-. 



as; 



str 



: I re- 

 improve 

 ^arker, 1959) in- 



ilt could 



::ve. An 



:f roie- 



_ :i^z'. praccLc- 



r factors of 



. :rv . It was soon 



in an area of difficult access and under stormy 

 weather conditians . The degree of precisicm 

 and success achieved would not have been 

 {>ossible without the resistivity-salt technique. 



Complete details on the reclamation of 

 Indian and Abrams Creeks will be included in 

 a separate report. 



SUMNL\RY 



of 



OI -• 



were 



Iti^S WiT; 



^reek a- 



_ng to variations in re- 

 -£is of r^ieated trials with 

 5ait at different water levels 

 rials with dyes, the resistiv- 

 of salt 

 plied in 

 . rrration of 8 



1 . The electrical resistance of water 

 is easily and quickly measured in the field widi 

 a porta hie resistivity meter. 



2 . A straight line relationship exists 

 ber*'een resistivity and total dissolved soUds 

 in non-turhid, freshwater. T::^ dissolved 

 solids, composed mostly of major electrolytes, 

 influence greatly the biological productivity of 

 water and determinations of same are therefore 

 important to nsher>- investigators . Measure- 

 ments of resistivity- can be used to estimate the 

 total ccntent of dissolved solids in water within 

 +2 i^m. Thus the long and tedious evaporation 

 technique of measuring total dissolved solids is 

 avoided. 



was / . 



min- 



da*^- :0 



mi' -m caa- 



:-.r 4 

 ^ta with 

 A strear r. cfs aided in 



r^ciamation process 

 rotenone needed in- 

 itially and at strengthening staticms downstream 

 to - illing concentraticms 



for ume . 



3 . A measurement of resistivity indicatej 

 the sofmess or hardness of water on a relative 

 scale. 



4 . The design and selection of electro- 

 fishing gear may be related to measurements of 

 resistivity of streams to achieve efficiency and 

 comparable returns in fish collecting. Resistiv- 

 ity dictates the type of electrode system needed, 

 the spacing of the electrodes, the type of power, 

 AC or DC; the voltage, 115 or 230; and whether 

 or not salt is needed to reduce the resistivity to 

 a workable level . 



' ■ >;ity of salt 



it several meas- 

 ates indicated that a bolt of rotenone 

 :re 20 to 24 hours to pass throu^ the 

 section. The flcvr -rz the date of rec- 

 lamation was 92 cfs ar , rotenone 

 ; : ^: -' ; ived 



- Tiin- 

 utes later, at 12:0 -. was precisely 

 the - — '' arrival ".'--le and Indus- 

 trie -orators. _ i„,., -as conducted 



5 . Eteterminations of the velocity, stretc 

 out, and dilution of known concentrations of salt 

 in a stream have been made accurately with a 

 resistivity meter under weather and water condi- 

 tions which, for the most part, ruled out the use 

 of dyes . These determinations on a solute were 

 assimied to apply to emulsions of rotenone and 

 were used successfiilly in the reclamation of two 

 trout streams. 



12 



