Large-Scale Slope Erosion Testing
(ASTM D 6459 modified)
of
Mulch and Grow
Terrain Lok BFM
over
Sandy Loam
December 2014
Submitted to:
AASHTO/NTPEP
444 North Capitol Street, NW, Suite 249
Washington, D.C. 20001
Attn: Russell Dabbs, NTPEP
Submitted by:
TRI/Environmental, Inc.
9063 Bee Caves Road
Austin, TX 78733
C. Joel Sprague
Project Manager
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
2
December 23, 2014
Mr. Russell Dabbs AASHTO/NTPEP
444 North Capitol Street, NW, Suite 249
Washington, D.C. 20001
E-mail: [email protected]
Subject: Large-scale Slope Testing of Mulch and Grow Terrain Lok BFM over Sandy Loam
Dear Mr. Dabbs:
This letter report presents the results for large-scale slope erosion tests performed on Mulch and
Grow Terrain Lok BFM hydraulically-applied erosion control product (HECP) over sandy loam.
All testing work was performed in general accordance with the ASTM D 6459, Standard Test
Method for Determination of Rolled Erosion Control Product (RECP) Performance in
Protecting Hillslopes from Rainfall-Induced Erosion modified as necessary to accommodate
hydraulically-applied mulch. The product was allowed to cure on the slopes for approximately
48 hours prior to testing. Generated results were used to develop the following general cover
factor (C-Factor) for the tested material:
C-Factor Mulch and Grow Terrain Lok BFM @ 3500lbs/acre = WITHDRAWN for cumulative R-Factor < 162
Eqn: C = WITHDRAWN
TRI is pleased to present this final report. Please feel free to call if we can answer any questions
or provide any additional information.
Sincerely,
C. Joel Sprague, P.E.
Senior Engineer
Geosynthetics Services Division
Cc: Sam Allen, Jarrett Nelson - TRI
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
3
SLOPE TESTING REPORT
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam TESTING EQUIPMENT AND PROCEDURES
Overview of Test and Apparatus
TRI/Environmental, Inc.'s (TRI's) large-scale slope erosion testing facility is located at the
Denver Downs Research Farm in Anderson, SC. Testing oversight is provided by C. Joel
Sprague, P.E. The large-scale testing reported herein was performed in accordance with ASTM
D 6459 modified as necessary to accommodate hydraulically-applied mulch, on 3:1 slopes using
loamy soil test plots measuring 40 ft long x 8 ft wide. The simulated rainfall was produced by ten
“rain trees” arranged around the perimeter of each test slope. Each rain tree has four sprinkler
heads atop a 15 ft riser pipe. The rainfall system has been calibrated prior to testing to determine
the number of sprinkler heads and associated pressure settings necessary to achieve target
rainfall intensities and drop sizes. The target rainfall intensities are 2, 4, and 6 in/hr and are
applied in sequence for 20 minutes each. Three replicate test slopes covered by the same
hydraulically-applied erosion control product (HECP) submitted were tested. The application
rate of the HECP was 3500 lb/acre. (Note: The mixing ratio was 125 gallons of water to 50 lb
mulch.) The product was allowed to cure on the slopes for approximately 48 hours prior to
testing. The erosion resistance provided by the product tested is obtained by comparing the
protected slope results to control (bare soil) results. Tables and graphs of rainfall versus soil loss
are generated from the accumulated data.
Hydraulic Erosion Control Product (HECP)
The following information and index properties were determined from the supplied products.
Table 1. Tested Product Information & Index Properties
Product Information and Index Property / Test Units Sampled Product Product Identification - Terrain Lok BFM
Manufacturing Plant Location - Ronda, NC
DLK Fibers2 % 76% ± 3%
Proprietary Cross-linking Tackifier % 5% ± 0.5%
Proprietary NonCross-linking Tackifier % 2% ± 0.25%
SAP (Proprietary Absorbent Fibers) % 5% ± 1%
Moisture Content % 12% ± 3%
Tensile Strength (ASTM D 6818 modified)1 lb/in
Tensile Elongation (ASTM D 6818 modified) 1 %
Thickness (ASTM 6525 modified) 1 mils
Light Penetration (ASTM 6567 modified) 1 % cover
Water Absorption (ASTM 1117 / ECTC TASC 00197) 1 % wt change
Mass / Unit Area (ASTM D 6566 modified) 1 osy
Note 1: Index specimens were made using the currently proposed ASTM procedure. Note 2: Percentage shown for DLK fibers is
the oven dried weight. The as-received (air dried) weight is 88% (76% totally dry fiber + 12% absorbed moisture).
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
4
Test Soil
The test soil used in the test plots had the following characteristics.
Table 2. TRI-Loam Characteristics
Soil Characteristic Test Method Value
% Gravel
ASTM D 422
0
% Sand 45
% Silt 35
% Clay 20
Liquid Limit, % ASTM D 4318
41
Plasticity Index, % 8
Soil Classification USDA Sandy Loam
Soil Classification USCS Sandy silty clay (ML-CL)
K-Factor D 6459 0.123
Preparation of the Test Slopes
The initial slope soil veneer (12-inch thick minimum) is placed and compacted. Compaction is
verified to be 90% (± 3%) of Proctor Standard density using ASTM D 2937 (drive-cylinder
method). Subsequently, the test slopes undergo a “standard” preparation procedure prior to each
slope test. First, any rills or depressions resulting from previous testing are filled in with test soil
and subject to heavy compaction. The entire test plot is then tilled to a depth not less than four
inches. The test slope is then raked to create a slope that is smooth both side-to-side and top-to-
bottom. Finally, a steel drum roller is rolled down-and-up the slope 3 times proceeding from one
side of the plot to the other. The submitted erosion control product is then installed using the
spray technique acceptable to the client. For this testing, TRI applied the product to the slopes.
Installation of Erosion Control Product on Test Slopes
As noted, the submitted erosion control product was installed as directed by the client. For the
tests reported herein, the HECP was mixed at a rate of 50 lbs mulch per 125 gallons of water and
applied at the rate of 3500 lb/acre. The applied material was allowed to cure for approximately
48 hours prior to testing.
Specific Test Procedure
withdrawn
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
5
TEST RESULTS
withdrawn
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
Appendix
APPENDIX A – RECORDED DATA
Test Record Sheets
Sediment Concentration Data
Runoff Data
Soil Moisture Content
Soil Loss Tables
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
Appendix
withdrawn
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
Appendix
APPENDIX B – TEST SOIL
Test Soil Grain Size Distribution Curve
Compaction Curves
Veneer Soil Compaction Verification
November 8, 2013
Corporate Laboratory: 9063 Bee Caves Road, Austin, TX 78733 / 800-880-TEST / 512-263-2101 / [email protected]
Denver Downs Research Facility: 4915 Clemson Blvd., Anderson, SC 29621 / 864-242-2220 / [email protected]
0
10
20
30
40
50
60
70
80
90
100
0.00010.0010.010.1110100
Perc
en
tF
iner
Particle Size (mm)
DDRF ASTM D 6459 Blended Test Soil
ASTM D 6459 Target Loam Range
Plasticity (ASTM D 4318)Liquid Limit: 30Plastic Limit: 22Plastic Index: 8
Soil classifies as a clayey sand (SC)in accordance with ASTM D 2487
The testing herein is based upon accepted industry practice as well as the test method listed. Test results reported herein do not apply
to samples other than those tested. TRI neither accepts responsibility for nor makes claim as to the final use and purpose of the material.
TRI observes and maintains client confidentiality. TRI limits reproduction of this report, except in full, without prior approval of TRI.
9063 Bee Caves Road Austin, TX 78733-6201 (512) 263-2101 (512) 263-2558 1-800-880-TEST
James Sprague, 11/08/13
Tested by: J.E.Sprague
80
85
90
95
100
105
110
115
120
10 15 20 25 30 35 40 45 50
Dry
Den
sity
(pcf
)
Moisture Content (%)
Proctor Compaction Test
2.80
2.60
2.70
Project: DDRF
Sample No.: SLOPE COMPOSITE
Test Date: NOVEMBER 8, 2013
Test Method: ASTM D 698 - Method A
Maximum Dry Density (pcf): 99.2
Optimum Moisture Content (%): 19.5
Location: Date: 11/8/2013
Drive Cylinder: Dia., mm = 98 Length, mm = 127 Volume, ft3= 0.034
Tube # 1 2 3 4 5 6
Wt. of Wet Soil + Mold (g) 2277.0 2282.0 2217.0 2242.0 2255.0 2266.0
Wt. of Mold (g) 615.0 615.0 615.0 615.0 615.0 615.0
Wt. of Wet Soil (g) 1662.0 1667.0 1602.0 1627.0 1640.0 1651.0
Tare Number B T M
Wt. of Tare (g) 14.2 14.2 14.2 14.2 14.2 14.2
Wt. of Wet Soil + Tare (g) 24.4 23.4 25.5 23.5 25.4 24.9
Wt. of Dry Soil + Tare (g) 22.9 22.1 23.7 22.0 23.8 23.3
Water Content, w (%) 17.336 16.456 18.927 19.206 16.649 17.563
Wet density, ɣwet = W' / Vh (lb/ft3) = 108.21 108.54 104.31 105.93 106.78 107.50
Dry density, ɣdry = ɣwet / [1 + w] (lb/ft3) = 92.22 93.20 87.70 88.87 91.54 91.44
Max Std. Proctor Dry density (lb/ft3) = 99.20 99.20 99.20 99.20 99.20 99.20
Opt. Moisture (%) = 19.50 19.50 19.50 19.50 19.50 19.50
Compaction as % of Std. Proctor = 93.0% 94.0% 88.4% 89.6% 92.3% 92.2%
Avg Compaction as % of Std. Proctor =
The testing herein is based upon accepted industry practice as well as the test method listed. Test results reported herein do not apply
to samples other than those tested. TRI neither accepts responsibility for nor makes claim as to the final use and purpose of the material.
TRI observes and maintains client confidentiality. TRI limits reproduction of this report, except in full, without prior approval of TRI.
9063 Bee Caves Road Austin, TX 78733-6201 (512) 263-2101 (512) 263-2558 1-800-880-TEST
James Sprague, 11/8/13
Quality Review/Date
Tested by: J.E. Sprague
Compaction Worksheet
ASTM D 2937
DDRF SLOPES
Compaction
Moisture Content
91.6%
Mulch and Grow Terrain Lok BFM HECP over Sandy Loam
Slope Erosion Testing for NTPEP
December 23, 2014
Appendix
APPENDIX C – RAINFALL DATA
Raindrop Size Distribution
Rainfall Calibration
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
50.00
2 4 6
% o
f R
ain
dro
ps
by
Mas
s
Rainfall Intensity, in/hr
Raindrop Size DistributionNovember 2013
0.21 - 0.425 mm 0.425 - 1.0 mm 1.0 - 2.0 mm 2.0 - 4.75 mm 4.75 - 6.3 mm 6.3 - 9.5 mm
Target raindrop size and distribution (no more than 10 % greater than 6 mm (0.24 in.) and no more than 10 % smaller than 1 mm (0.04 in.)).
Date: 8-Nov-13 Start Time: 8:45 AM End Time: 9:00 AM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 11 mm d = 12 mm X
i = 1.73 in/hr B i = 1.89 in/hr P = 9 psi X
X d = 12 mm d = 11 mm X
psi X P = 9 psi i = 1.89 in/hr C i = 1.73 in/hr X
X d = 12 mm d = 13 mm X
X i = 1.89 in/hr D i = 2.05 in/hr P = 9 psi X
X d = 13 mm d = 13 mm X
psi X P = 9 psi i = 2.05 in/hr E i = 2.05 in/hr X
X d = 13 mm d = 14 mm X
X i = 2.05 in/hr F i = 2.20 in/hr P = 9 psi X
X d = 13 mm d = 13 mm X
psi X P = 9 psi i = 2.05 in/hr G i = 2.05 in/hr X
X d = 13 mm d = 12 mm X
X i = 2.05 in/hr H i = 1.89 in/hr P = 9 psi X
X d = 12 mm d = 15 mm X
X P = 9 psi i = 1.89 in/hr I i = 2.36 in/hr X
X d = 13 mm d = 13 mm X
X i = 2.05 in/hr J i = 2.05 in/hr P = 9 X
d = 11 mm d = 12 mm X
i = 1.73 in/hr i = 1.89 in/hr X
Bottom Catch: 95 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 12.55 mm
Average Rainfall Intensity: 1.98 in/hr
Christiansen Uniformity Coefficient: 94
15 16
17
14
18
1 2
A
19 20
13
11
5 6
4
7 8
9 10
3
12
Rainfall Calibration
TOP OF SLOPE
DDRF
Slope 1 - Target 2 in/hr
X X X X
Date: 8-Nov-13 Start Time: 9:15 AM End Time: 9:30 AM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 24 mm d = 23 mm X
i = 3.78 in/hr B i = 3.62 in/hr P = 9 psi X
X d = 25 mm d = 23 mm X
psi X P = 9 psi i = 3.94 in/hr C i = 3.62 in/hr X
X d = 26 mm d = 25 mm X
X i = 4.09 in/hr D i = 3.94 in/hr P = 9 psi X
X d = 26 mm d = 27 mm X
psi X P = 9 psi i = 4.09 in/hr E i = 4.25 in/hr X
X d = 27 mm d = 27 mm X
X i = 4.25 in/hr F i = 4.25 in/hr P = 9 psi X
X d = 26 mm d = 26 mm X
psi X P = 9 psi i = 4.09 in/hr G i = 4.09 in/hr X
X d = 27 mm d = 27 mm X
X i = 4.25 in/hr H i = 4.25 in/hr P = 9 psi X
X d = 27 mm d = 25 mm X
psi X P = 9 psi i = 4.25 in/hr I i = 3.94 in/hr X
X d = 26 mm d = 26 mm X
X i = 4.09 in/hr J i = 4.09 in/hr P = 9 psi X
d = 25 mm d = 25 mm X
i = 3.94 in/hr i = 3.94 in/hr X
Bottom Catch: 205 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 25.65 mm
Average Rainfall Intensity: 4.04 in/hr
Christiansen Uniformity Coefficient: 96
DDRF
Rainfall Calibration
7 8
9 10
3 4
19 20
13 14
TOP OF SLOPE
Slope 1 - Target 4 in/hr
18
5 6
A
15 16
17
X X X X
1 2
11 12
Date: 8-Nov-13 Start Time: 9:43 AM End Time: 9:58 AM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 37 mm d = 36 mm X
i = 5.83 in/hr B i = 5.67 in/hr P = 9 psi X
X d = 37 mm d = 38 mm X
psi X P = 9 psi i = 5.83 in/hr C i = 5.98 in/hr X
X d = 38 mm d = 40 mm X
X i = 5.98 in/hr D i = 6.30 in/hr P = 9 psi X
X d = 38 mm d = 39 mm X
psi X P = 9 psi i = 5.98 in/hr E i = 6.14 in/hr X
X d = 40 mm d = 41 mm X
X i = 6.30 in/hr F i = 6.46 in/hr P = 9 psi X
X d = 38 mm d = 40 mm X
psi X P = 9 psi i = 5.98 in/hr G i = 6.30 in/hr X
X d = 37 mm d = 39 mm X
X i = 5.83 in/hr H i = 6.14 in/hr P = 9 psi X
X d = 37 mm d = 42 mm X
psi X P = 9 psi i = 5.83 in/hr I i = 6.61 in/hr X
X d = 36 mm d = 38 mm X
X i = 5.67 in/hr J i = 5.98 in/hr P = 9 psi X
d = 36 mm d = 36 mm X
i = 5.67 in/hr i = 5.67 in/hr X
Bottom Catch: 300 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 38.15 mm
Average Rainfall Intensity: 6.01 in/hr
Christiansen Uniformity Coefficient: 96
15 16
17
14
18
1 2
A
19 20
13
11
5 6
4
7 8
9 10
3
12
Slope 1 - Target 6 in/hr
TOP OF SLOPE
DDRF
Rainfall Calibration
X X X X
Date: 8-Nov-13 Start Time: 10:30 AM End Time: 10:45 AM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 11 mm d = 12 mm X
i = 1.73 in/hr B i = 1.89 in/hr P = 9 psi X
X d = 13 mm d = 13 mm X
psi X P = 9 psi i = 2.05 in/hr C i = 2.05 in/hr X
X d = 14 mm d = 13 mm X
X i = 2.20 in/hr D i = 2.05 in/hr P = 9 psi X
X d = 13 mm d = 13 mm X
psi X P = 9 psi i = 2.05 in/hr E i = 2.05 in/hr X
X d = 14 mm d = 14 mm X
X i = 2.20 in/hr F i = 2.20 in/hr P = 9 psi X
X d = 14 mm d = 13 mm X
psi X P = 9 psi i = 2.20 in/hr G i = 2.05 in/hr X
X d = 14 mm d = 14 mm X
X i = 2.20 in/hr H i = 2.20 in/hr P = 9 psi X
X d = 14 mm d = 13 mm X
psi X P = 9 psi i = 2.20 in/hr I i = 2.05 in/hr X
X d = 13 mm d = 12 mm X
X i = 2.05 in/hr J i = 1.89 in/hr P = 9 psi X
d = 11 mm d = 12 mm X
i = 1.73 in/hr i = 1.89 in/hr X
Bottom Catch: 100 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 13 mm
Average Rainfall Intensity: 2.05 in/hr
Christiansen Uniformity Coefficient: 95
DDRF
Rainfall Calibration
7 8
9 10
3 4
19 20
13 14
TOP OF SLOPE
Slope 2 - Target 2 in/hr
18
5 6
A
15 16
17
X X X X
1 2
11 12
Date: 8-Nov-13 Start Time: 10:51 AM End Time: 11:06 AM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 22 mm d = 22 mm X
i = 3.46 in/hr B i = 3.46 in/hr P = 9 psi X
X d = 24 mm d = 26 mm X
psi X P = 9 psi i = 3.78 in/hr C i = 4.09 in/hr X
X d = 26 mm d = 25 mm X
X i = 4.09 in/hr D i = 3.94 in/hr P = 9 psi X
X d = 26 mm d = 27 mm X
psi X P = 9 psi i = 4.09 in/hr E i = 4.25 in/hr X
X d = 28 mm d = 25 mm X
X i = 4.41 in/hr F i = 3.94 in/hr P = 9 psi X
X d = 27 mm d = 27 mm X
psi X P = 9 psi i = 4.25 in/hr G i = 4.25 in/hr X
X d = 28 mm d = 27 mm X
X i = 4.41 in/hr H i = 4.25 in/hr P = 9 psi X
X d = 25 mm d = 28 mm X
psi X P = 9 psi i = 3.94 in/hr I i = 4.41 in/hr X
X d = 26 mm d = 25 mm X
X i = 4.09 in/hr J i = 3.94 in/hr P = 9 psi X
d = 22 mm d = 23 mm X
i = 3.46 in/hr i = 3.62 in/hr X
Bottom Catch: 200 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 25.45 mm
Average Rainfall Intensity: 4.01 in/hr
Christiansen Uniformity Coefficient: 94
15 16
17
14
18
1 2
A
19 20
13
11
5 6
4
7 8
9 10
3
12
Slope 2 - Target 4 in/hr
TOP OF SLOPE
DDRF
Rainfall Calibration
X X X X
Date: 8-Nov-13 Start Time: 11:15 AM End Time: 11:30 AM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 35 mm d = 36 mm X
i = 5.51 in/hr B i = 5.67 in/hr P = 9 psi X
X d = 38 mm d = 39 mm X
psi X P = 9 psi i = 5.98 in/hr C i = 6.14 in/hr X
X d = 40 mm d = 39 mm X
X i = 6.30 in/hr D i = 6.14 in/hr P = 9 psi X
X d = 39 mm d = 36 mm X
psi X P = 9 psi i = 6.14 in/hr E i = 5.67 in/hr X
X d = 38 mm d = 38 mm X
X i = 5.98 in/hr F i = 5.98 in/hr P = 9 psi X
X d = 40 mm d = 41 mm X
psi X P = 9 psi i = 6.30 in/hr G i = 6.46 in/hr X
X d = 39 mm d = 40 mm X
X i = 6.14 in/hr H i = 6.30 in/hr P = 9 psi X
X d = 39 mm d = 39 mm X
psi X P = 9 psi i = 6.14 in/hr I i = 6.14 in/hr X
X d = 37 mm d = 36 mm X
X i = 5.83 in/hr J i = 5.67 in/hr P = 9 psi X
d = 33 mm d = 36 mm X
i = 5.20 in/hr i = 5.67 in/hr X
Bottom Catch: 295 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 37.9 mm
Average Rainfall Intensity: 5.97 in/hr
Christiansen Uniformity Coefficient: 96
DDRF
Rainfall Calibration
7 8
9 10
3 4
19 20
13 14
TOP OF SLOPE
Slope 2 - Target 6 in/hr
18
5 6
A
15 16
17
X X X X
1 2
11 12
Date: 8-Nov-13 Start Time: 1:05 PM End Time: 1:20 PM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 13 mm d = 12 mm X
i = 2.05 in/hr B i = 1.89 in/hr P = 9 psi X
X d = 12 mm d = 13 mm X
psi X P = 9 psi i = 1.89 in/hr C i = 2.05 in/hr X
X d = 13 mm d = 13 mm X
X i = 2.05 in/hr D i = 2.05 in/hr P = 9 psi X
X d = 14 mm d = 12 mm X
psi X P = 9 psi i = 2.20 in/hr E i = 1.89 in/hr X
X d = 14 mm d = 13 mm X
X i = 2.20 in/hr F i = 2.05 in/hr P = 9 psi X
X d = 13 mm d = 14 mm X
psi X P = 9 psi i = 2.05 in/hr G i = 2.20 in/hr X
X d = 13 mm d = 13 mm X
X i = 2.05 in/hr H i = 2.05 in/hr P = 9 psi X
X d = 13 mm d = 11 mm X
psi X P = 9 psi i = 2.05 in/hr I i = 1.73 in/hr X
X d = 11 mm d = 11 mm X
X i = 1.73 in/hr J i = 1.73 in/hr P = 9 psi X
d = 11 mm d = 11 mm X
i = 1.73 in/hr i = 1.73 in/hr X
Bottom Catch: 95 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 12.5 mm
Average Rainfall Intensity: 1.97 in/hr
Christiansen Uniformity Coefficient: 93
15 16
17
14
18
1 2
A
19 20
13
11
5 6
4
7 8
9 10
3
12
Slope 3 - Target 2 in/hr
TOP OF SLOPE
DDRF
Rainfall Calibration
X X X X
Date: 8-Nov-13 Start Time: 1:30 PM End Time: 1:45 PM
Test Time: 15 min. (circle "x" for open valves)
P = 9 psi
d = 24 mm d = 24 mm X
i = 3.78 in/hr B i = 3.78 in/hr P = 9 psi X
X d = 26 mm d = 27 mm X
psi X P = 9 psi i = 4.09 in/hr C i = 4.25 in/hr X
X d = 28 mm d = 26 mm X
X i = 4.41 in/hr D i = 4.09 in/hr P = 9 psi X
X d = 29 mm d = 25 mm X
psi X P = 9 psi i = 4.57 in/hr E i = 3.94 in/hr X
X d = 25 mm d = 26 mm X
X i = 3.94 in/hr F i = 4.09 in/hr P = 9 psi X
X d = 27 mm d = 24 mm X
psi X P = 9 psi i = 4.25 in/hr G i = 3.78 in/hr X
X d = 26 mm d = 26 mm X
X i = 4.09 in/hr H i = 4.09 in/hr P = 9 psi X
X d = 25 mm d = 23 mm X
psi X P = 9 psi i = 3.94 in/hr I i = 3.62 in/hr X
X d = 25 mm d = 24 mm X
X i = 3.94 in/hr J i = 3.78 in/hr P = 9 psi X
d = 22 mm d = 22 mm X
i = 3.46 in/hr i = 3.46 in/hr X
Bottom Catch: 195 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 25.2 mm
Average Rainfall Intensity: 3.97 in/hr
Christiansen Uniformity Coefficient: 94
DDRF
Rainfall Calibration
7 8
9 10
3 4
19 20
13 14
TOP OF SLOPE
Slope 3 - Target 4 in/hr
18
5 6
A
15 16
17
X X X X
1 2
11 12
Date: 8-Nov-13 Start Time: 2:01 PM End Time: 2:16 PM
Test Time: 15.00 min. (circle "x" for open valves)
P = 9 psi
d = 37 mm d = 35 mm X
i = 5.83 in/hr B i = 5.51 in/hr P = 9 psi X
X d = 39 mm d = 37 mm X
psi X P = 9 psi i = 6.14 in/hr C i = 5.83 in/hr X
X d = 38 mm d = 36 mm X
X i = 5.98 in/hr D i = 5.67 in/hr P = 9 psi X
X d = 39 mm d = 39 mm X
psi X P = 9 psi i = 6.14 in/hr E i = 6.14 in/hr X
X d = 41 mm d = 41 mm X
X i = 6.46 in/hr F i = 6.46 in/hr P = 9 psi X
X d = 39 mm d = 38 mm X
psi X P = 9 psi i = 6.14 in/hr G i = 5.98 in/hr X
X d = 41 mm d = 40 mm X
X i = 6.46 in/hr H i = 6.30 in/hr P = 9 psi X
X d = 40 mm d = 37 mm X
psi X P = 9 psi i = 6.30 in/hr I i = 5.83 in/hr X
X d = 36 mm d = 35 mm X
X i = 5.67 in/hr J i = 5.51 in/hr P = 9 psi X
d = 36 mm d = 35 mm X
i = 5.67 in/hr i = 5.51 in/hr X
Bottom Catch: 290 gal
Inlet Pressure: 16 psi
Average Wind: 0 mph
Average Depth: 37.95 mm
Average Rainfall Intensity: 5.98 in/hr
Christiansen Uniformity Coefficient: 95
15 16
17
14
18
1 2
A
19 20
13
11
5 6
4
7 8
9 10
3
12
Slope 3 - Target 6 in/hr
TOP OF SLOPE
DDRF
Rainfall Calibration
X X X X
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