Lamotte SECCHI DISK 1062 User Manual download pdf

SECCHI DISK

CODE 1062

The Secchi Disk is a white circular plastic plate, 20 cm in diameter that is

used to determine the turbidity or degree of visibility in natural water. The

Secchi Disk provides a very simple means of making transparency

determinations in natural waters. A measured line is attached to the

center of the disk by means of a special fitting that stabilizes the disk so

that it will be parallel to the water’s surface. Best results are obtained in

the shadow of a boat or dock. The best readings are usually obtained after

early morning and before late afternoon.

1. Lower Secchi Disk (1062) into water until it just disappears. Read

depth from calibrated line.

2. Raise Secchi Disk until it just appears. Read depth from calibrated

line.

3. Add readings from Steps 1 and 2. Divide by 2. Record as Secchi Disk

Transparency.

Water that is clear has a high transparency. Transparency usually decreases

in the summer when plankton, silt and organic matter are more likely to

be prevalent. The most transparent lakes are usually seepage lakes since

the water is filtered before entering the lake, reducing silt bearing

influents. Drainage lakes carry more silt and therefore are less transparent.

For example, a drainage lake may be in a class of 1.0 to 1.4 m but a seepage

lake in the same area may give readings of 3.0 to 4.0 m. A high reading in

the class of 19 to 21m would indicate extreme clarity.

LaMOTTE COMPANY

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PO Box 329 • Chestertown • Mary land • 21620 • USA

800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax 410-778-6394

Visit us on the web at www.lamotte.com

2/07

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SECCHI DISK 1

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Page 1 - SECCHI DISK

SECCHI DISKCODE 1062The Secchi Disk is a white circular plastic plate, 20 cm in diameter that isused to determine the turbidity or degree of visibilit

Page 2

SECCHI DISKCODE 1062The Secchi Disk is a white circular plastic plate, 20 cm in diameter that isused to determine the turbidity or degree of visibilit

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Lamotte SECCHI DISK 1062 User Manual

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