Salt Slug Procedure

Prep

• conductivity meter
• 3pcs 1 Liter bottles
• 1pcs precisely known volume
• 1 pcs precisely measured salt
• 10-20 cc syringe
• spare C batteries
• bucket? or mixing tank bigger than 1L

At site procedure

• measure steady state conditions at upstream (eC & temperature)
• measure steady state conditions at downstream (eC & temperature)
• Fill known volume and dump into each 1 liter volume
• pour packet of salt into one of the known volumes
• well mix the salt slug
• extract 10 mL from well mixed salt slug and squirt into one of the two remaining 1 liter volumes
• secure conductivity meter at downstream location and start logging
  • observe background levels
• pour salt slug in at upper reach location

k calculation

• keep 2 1L bottles at stream temperature and well mix the one with salt solution (salted solution is the Secondary Solution).
• pour the natural stream water into bucket
• in 2 to 5 mL increments add Secondary Solution water to mixing bucket and measure eC & Temperature after mixing
• record in fielbook: mL added, eC & temperature in the mixing tank.
• repeat for at least 3 samples. Literature suggests starting with 2mL per bucket dump.