# DD Form 1794 Grain-Size Analysis (Hydrometer Method)

DD Form 1794 - also known as the "Grain-size Analysis (hydrometer Method)" - is a United States Military form issued by the Department of Defense.

The form - often incorrectly referred to as the DA form 1794 - was last revised on December 1, 1999. Download an up-to-date fillable PDF version of the DD 1794 below or request a copy through the chain of command.

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GRAIN-SIZE ANALYSIS (HYDROMETER METHOD)
1. PROJECT
2. DATE
3. BORING NUMBER
4. SAMPLE OR SPECIMEN NUMBER
5. CLASSIFICATION
)
6. DISH NUMBER
7. GRADUATE NUMBER
8. HYDROMETER NUMBER/TYPE (151H/152H
9. DISPERSING AGENT USED
10. QUANTITY
11. COMPOSITE CORRECTION
12. DECIMAL FINES (Block 29, DD Form 1206)
13. SPECIFIC GRAVITY OF SOLIDS (Block 6n,
G
=
DD Form 1208)
s
14.
15.
16.
17.
18.
19.
20.
21.
22.
ELAPSED
ACTUAL
CORRECTED
TEMP
TEMPERATURE AND
EFFECTIVE
PARTICLE
PERCENT FINER
TIME
TIME, (T)
HYDROMETER
READING (R)
(
C)
SPECIFIC GRAVITY
DEPTH (L)
DIAMETER
1
minutes
READING (R )
CONSTANT (K)
(D), mm
a. PARTIAL
b. TOTAL
23. DISH + DRY SOIL
The particle diameter (D) is calculated from Stokes' equation using the corrected hydrometer reading.
Use the following formula to solve for particle diameter (D):
D = K
L/T
WEIGHT
24. DISH
(Grams)
1
Corrected hydrometer reading (R) = actual hydrometer reading (R ) + composite correction
(W
)
25. DRY SOIL
s
W
= Oven-dry weight (in grams) of soil used for hydrometer analysis
s
Hydrometer graduated in specific gravity (151H)
Hydrometer graduated in grams per liter (152H)
G
100,000
(R)(a)
s
Partial Percent Finer =
x
(R - 1)
x 100
G
- 1
W
W
s
s
s
(a = specific gravity of solids correction factor)
Total Percent Finer = Partial Percent Finer x Decimal fines (Block 12)
26.
REMARKS
FROST GROUP:
27.
TECHNICIAN
28.
COMPUTED
BY
29.
CHECKED
BY
(Signature)
(Signature)
(Signature)
DD FORM 1794, DEC 1999
PREVIOUS EDITION IS OBSOLETE.
Reset
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GRAIN-SIZE ANALYSIS (HYDROMETER METHOD)
1. PROJECT
2. DATE
3. BORING NUMBER
4. SAMPLE OR SPECIMEN NUMBER
5. CLASSIFICATION
)
6. DISH NUMBER
7. GRADUATE NUMBER
8. HYDROMETER NUMBER/TYPE (151H/152H
9. DISPERSING AGENT USED
10. QUANTITY
11. COMPOSITE CORRECTION
12. DECIMAL FINES (Block 29, DD Form 1206)
13. SPECIFIC GRAVITY OF SOLIDS (Block 6n,
G
=
DD Form 1208)
s
14.
15.
16.
17.
18.
19.
20.
21.
22.
ELAPSED
ACTUAL
CORRECTED
TEMP
TEMPERATURE AND
EFFECTIVE
PARTICLE
PERCENT FINER
TIME
TIME, (T)
HYDROMETER
READING (R)
(
C)
SPECIFIC GRAVITY
DEPTH (L)
DIAMETER
1
minutes
READING (R )
CONSTANT (K)
(D), mm
a. PARTIAL
b. TOTAL
23. DISH + DRY SOIL
The particle diameter (D) is calculated from Stokes' equation using the corrected hydrometer reading.
Use the following formula to solve for particle diameter (D):
D = K
L/T
WEIGHT
24. DISH
(Grams)
1
Corrected hydrometer reading (R) = actual hydrometer reading (R ) + composite correction
(W
)
25. DRY SOIL
s
W
= Oven-dry weight (in grams) of soil used for hydrometer analysis
s
Hydrometer graduated in specific gravity (151H)
Hydrometer graduated in grams per liter (152H)
G
100,000
(R)(a)
s
Partial Percent Finer =
x
(R - 1)
x 100
G
- 1
W
W
s
s
s
(a = specific gravity of solids correction factor)
Total Percent Finer = Partial Percent Finer x Decimal fines (Block 12)
26.
REMARKS
FROST GROUP:
27.
TECHNICIAN
28.
COMPUTED
BY
29.
CHECKED
BY
(Signature)
(Signature)
(Signature)
DD FORM 1794, DEC 1999
PREVIOUS EDITION IS OBSOLETE.
Reset
Adobe Professional 7.0

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