NV FLAP NYE 10(1) Final Hydraulics Report_signed sealed.pdf
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This is a Final Hydraulics Report for the NV FLAP NYE 10(1) Bob Ruud Memorial Highway and Bell Vista Avenue project located in Pahrump, Nevada. The report contains precipitation frequency data from NOAA Atlas 14 for the project location (latitude 36.2637, longitude -116.0029) with point precipitation frequency estimates for various storm durations and average recurrence intervals ranging from 5 minutes to 60 days, presented both in depth (inches) and intensity (inches/hour) formats with 90% confidence intervals. The document includes three basin maps depicting drainage patterns for the West, Middle, and East alignments of Bob Ruud Memorial Highway and associated drainage structures.
The report also incorporates technical guidance from ADS (Advanced Drainage Systems) regarding minimum and maximum cover heights for high-performance (HP) storm pipe installations. Minimum cover requirements specify 1 foot of cover over pipe crowns for 12- to 48-inch diameter pipes under AASHTO H-20, H-25, or HL-93 traffic loads, with 2 feet required for 60-inch diameter pipes. Maximum cover guidance is provided based on backfill material types and compaction levels, with material properties for polypropylene impact-modified copolymer pipes rated at 3,500 psi ultimate strength and 175,000 psi modulus of elasticity. The technical specifications assume pipe installation per ASTM D2321 standards, with no hydrostatic pressure, and applications for storm drainage requiring fills exceeding specified heights or groundwater hydrostatic pressure requiring consultation with an ADS engineer.
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3/6/23, 9:21 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.2637&lon=-116.0029&data=depth&units=english&series=pds 1/4
NOAA Atlas 14, Volume 1, Version 5 Location name: Pahrump, Nevada, USA* Latitude: 36.2637°, Longitude: -116.0029°
Elevation: m/ft**
* source: ESRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey
Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan
NOAA, National Weather Service, Silver Spring, Maryland
PF_tabular | PF_graphical | Maps_&_aerials
PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Duration Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 0.108 (0.084‑0.125)
0.143 (0.111‑0.167)
0.207 (0.161‑0.241)
0.261 (0.202‑0.306)
0.344 (0.265‑0.406)
0.416 (0.316‑0.493)
0.499 (0.373‑0.598)
0.593 (0.435‑0.719)
0.739 (0.529‑0.915)
0.867 (0.607‑1.10)
10-min 0.165 (0.128‑0.190)
0.218 (0.169‑0.254)
0.315 (0.245‑0.367)
0.398 (0.308‑0.466)
0.524 (0.403‑0.618)
0.633 (0.481‑0.751)
0.760 (0.568‑0.910)
0.902 (0.662‑1.10)
1.13 (0.805‑1.39)
1.32 (0.924‑1.67)
15-min 0.204 (0.159‑0.235)
0.270 (0.209‑0.315)
0.390 (0.304‑0.455)
0.493 (0.381‑0.577)
0.650 (0.500‑0.767)
0.785 (0.597‑0.930)
0.942 (0.704‑1.13)
1.12 (0.821‑1.36)
1.39 (0.998‑1.73)
1.64 (1.15‑2.07)
30-min 0.275 (0.214‑0.317)
0.363 (0.282‑0.424)
0.526 (0.409‑0.613)
0.664 (0.514‑0.777)
0.875 (0.673‑1.03)
1.06 (0.804‑1.25)
1.27 (0.948‑1.52)
1.51 (1.11‑1.83)
1.88 (1.34‑2.33)
2.20 (1.54‑2.78)
60-min 0.340 (0.264‑0.392)
0.449 (0.349‑0.525)
0.650 (0.506‑0.758)
0.821 (0.636‑0.962)
1.08 (0.833‑1.28)
1.31 (0.994‑1.55)
1.57 (1.17‑1.88)
1.86 (1.37‑2.26)
2.32 (1.66‑2.88)
2.73 (1.91‑3.44)
2-hr 0.391 (0.326‑0.475)
0.512 (0.428‑0.625)
0.729 (0.606‑0.890)
0.914 (0.752‑1.12)
1.20 (0.973‑1.47)
1.45 (1.16‑1.78)
1.74 (1.37‑2.14)
2.08 (1.59‑2.57)
2.60 (1.94‑3.25)
3.06 (2.22‑3.87)
3-hr 0.442 (0.374‑0.530)
0.577 (0.488‑0.695)
0.807 (0.681‑0.971)
0.998 (0.834‑1.20)
1.29 (1.07‑1.55)
1.54 (1.25‑1.85)
1.83 (1.46‑2.21)
2.16 (1.69‑2.63)
2.68 (2.04‑3.31)
3.14 (2.34‑3.92)
6-hr 0.560 (0.481‑0.661)
0.733 (0.626‑0.860)
1.02 (0.869‑1.19)
1.25 (1.06‑1.46)
1.58 (1.33‑1.86)
1.86 (1.54‑2.19)
2.18 (1.79‑2.58)
2.54 (2.04‑3.01)
3.08 (2.42‑3.71)
3.56 (2.74‑4.34)
12-hr 0.703 (0.608‑0.806)
0.921 (0.800‑1.06)
1.28 (1.11‑1.48)
1.56 (1.35‑1.79)
1.96 (1.68‑2.25)
2.27 (1.93‑2.62)
2.61 (2.19‑3.02)
2.97 (2.45‑3.46)
3.48 (2.82‑4.11)
3.96 (3.16‑4.72)
24-hr 0.805 (0.695‑0.927)
1.06 (0.920‑1.22)
1.44 (1.25‑1.67)
1.71 (1.48‑1.99)
2.06 (1.76‑2.40)
2.32 (1.97‑2.70)
2.63 (2.21‑3.03)
3.00 (2.48‑3.49)
3.51 (2.85‑4.15)
4.00 (3.19‑4.77)
2-day 0.871 (0.755‑0.999)
1.15 (0.994‑1.31)
1.57 (1.36‑1.79)
1.87 (1.61‑2.14)
2.24 (1.92‑2.57)
2.51 (2.14‑2.89)
2.79 (2.35‑3.24)
3.06 (2.56‑3.56)
3.55 (2.87‑4.19)
4.04 (3.22‑4.82)
3-day 0.904 (0.787‑1.03)
1.20 (1.04‑1.36)
1.64 (1.42‑1.86)
1.95 (1.68‑2.22)
2.34 (2.02‑2.67)
2.63 (2.25‑3.00)
2.92 (2.48‑3.35)
3.20 (2.70‑3.70)
3.64 (3.00‑4.25)
4.06 (3.28‑4.84)
4-day 0.937 (0.819‑1.07)
1.25 (1.09‑1.41)
1.71 (1.49‑1.93)
2.03 (1.76‑2.29)
2.44 (2.12‑2.76)
2.75 (2.37‑3.11)
3.04 (2.61‑3.46)
3.34 (2.84‑3.83)
3.73 (3.13‑4.31)
4.08 (3.33‑4.86)
7-day 1.06 (0.924‑1.20)
1.41 (1.23‑1.58)
1.92 (1.68‑2.17)
2.29 (1.99‑2.58)
2.73 (2.37‑3.09)
3.06 (2.64‑3.46)
3.38 (2.91‑3.85)
3.68 (3.14‑4.21)
4.07 (3.45‑4.71)
4.37 (3.65‑5.09)
10-day 1.14 (1.00‑1.29)
1.51 (1.33‑1.71)
2.07 (1.82‑2.35)
2.45 (2.15‑2.78)
2.92 (2.55‑3.32)
3.26 (2.83‑3.71)
3.58 (3.09‑4.09)
3.89 (3.34‑4.46)
4.29 (3.63‑4.96)
4.58 (3.83‑5.34)
20-day 1.30 (1.14‑1.47)
1.75 (1.52‑1.98)
2.43 (2.11‑2.75)
2.89 (2.50‑3.26)
3.47 (2.99‑3.94)
3.89 (3.34‑4.43)
4.29 (3.67‑4.91)
4.68 (3.95‑5.38)
5.17 (4.32‑6.01)
5.53 (4.59‑6.46)
30-day 1.45 (1.26‑1.66)
1.97 (1.70‑2.24)
2.80 (2.42‑3.16)
3.37 (2.92‑3.81)
4.10 (3.53‑4.64)
4.64 (3.98‑5.25)
5.17 (4.41‑5.88)
5.69 (4.81‑6.52)
6.35 (5.34‑7.37)
6.85 (5.69‑8.01)
45-day 1.61 (1.39‑1.85)
2.19 (1.90‑2.52)
3.18 (2.74‑3.65)
3.87 (3.34‑4.44)
4.77 (4.10‑5.47)
5.45 (4.66‑6.28)
6.14 (5.19‑7.10)
6.82 (5.72‑7.92)
7.73 (6.36‑9.05)
8.42 (6.82‑9.99)
60-day 1.76 (1.51‑2.04)
2.42 (2.08‑2.80)
3.55 (3.05‑4.10)
4.37 (3.75‑5.04)
5.45 (4.64‑6.29)
6.27 (5.31‑7.26)
7.11 (5.98‑8.28)
7.96 (6.61‑9.29)
9.10 (7.42‑10.7)
9.98 (8.00‑11.8)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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PF graphical
3/6/23, 9:21 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.2637&lon=-116.0029&data=depth&units=english&series=pds 2/4
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Maps & aerials
Small scale terrain
3/6/23, 9:22 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.2637&lon=-116.0029&data=intensity&units=english&series=pds 1/4
NOAA Atlas 14, Volume 1, Version 5 Location name: Pahrump, Nevada, USA* Latitude: 36.2637°, Longitude: -116.0029°
Elevation: m/ft**
* source: ESRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey
Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan
NOAA, National Weather Service, Silver Spring, Maryland
PF_tabular | PF_graphical | Maps_&_aerials
PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1
Duration Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 1.30 (1.01‑1.50)
1.72 (1.33‑2.00)
2.48 (1.93‑2.89)
3.13 (2.42‑3.67)
4.13 (3.18‑4.87)
4.99 (3.79‑5.92)
5.99 (4.48‑7.18)
7.12 (5.22‑8.63)
8.87 (6.35‑11.0)
10.4 (7.28‑13.1)
10-min 0.990 (0.768‑1.14)
1.31 (1.01‑1.52)
1.89 (1.47‑2.20)
2.39 (1.85‑2.80)
3.14 (2.42‑3.71)
3.80 (2.89‑4.51)
4.56 (3.41‑5.46)
5.41 (3.97‑6.57)
6.75 (4.83‑8.36)
7.91 (5.54‑10.0)
15-min 0.816 (0.636‑0.940)
1.08 (0.836‑1.26)
1.56 (1.22‑1.82)
1.97 (1.52‑2.31)
2.60 (2.00‑3.07)
3.14 (2.39‑3.72)
3.77 (2.82‑4.51)
4.47 (3.28‑5.43)
5.58 (3.99‑6.90)
6.54 (4.58‑8.26)
30-min 0.550 (0.428‑0.634)
0.726 (0.564‑0.848)
1.05 (0.818‑1.23)
1.33 (1.03‑1.55)
1.75 (1.35‑2.06)
2.11 (1.61‑2.50)
2.54 (1.90‑3.04)
3.01 (2.21‑3.66)
3.75 (2.69‑4.65)
4.41 (3.09‑5.57)
60-min 0.340 (0.264‑0.392)
0.449 (0.349‑0.525)
0.650 (0.506‑0.758)
0.821 (0.636‑0.962)
1.08 (0.833‑1.28)
1.31 (0.994‑1.55)
1.57 (1.17‑1.88)
1.86 (1.37‑2.26)
2.32 (1.66‑2.88)
2.73 (1.91‑3.44)
2-hr 0.196 (0.163‑0.238)
0.256 (0.214‑0.312)
0.364 (0.303‑0.445)
0.457 (0.376‑0.558)
0.601 (0.486‑0.732)
0.726 (0.582‑0.888)
0.872 (0.684‑1.07)
1.04 (0.797‑1.28)
1.30 (0.968‑1.62)
1.53 (1.11‑1.93)
3-hr 0.147 (0.125‑0.176)
0.192 (0.163‑0.231)
0.269 (0.227‑0.323)
0.332 (0.278‑0.399)
0.430 (0.355‑0.516)
0.512 (0.417‑0.617)
0.609 (0.487‑0.737)
0.719 (0.564‑0.876)
0.892 (0.680‑1.10)
1.04 (0.778‑1.31)
6-hr 0.094 (0.080‑0.110)
0.122 (0.105‑0.144)
0.170 (0.145‑0.199)
0.209 (0.177‑0.244)
0.264 (0.222‑0.310)
0.310 (0.258‑0.365)
0.364 (0.298‑0.430)
0.423 (0.340‑0.503)
0.515 (0.405‑0.620)
0.595 (0.458‑0.725)
12-hr 0.058 (0.050‑0.067)
0.076 (0.066‑0.088)
0.106 (0.092‑0.123)
0.130 (0.112‑0.149)
0.162 (0.139‑0.186)
0.188 (0.160‑0.217)
0.216 (0.182‑0.250)
0.246 (0.204‑0.287)
0.289 (0.234‑0.341)
0.329 (0.262‑0.392)
24-hr 0.034 (0.029‑0.039)
0.044 (0.038‑0.051)
0.060 (0.052‑0.069)
0.071 (0.061‑0.083)
0.086 (0.073‑0.100)
0.097 (0.082‑0.113)
0.110 (0.092‑0.126)
0.125 (0.103‑0.146)
0.146 (0.119‑0.173)
0.167 (0.133‑0.199)
2-day 0.018 (0.016‑0.021)
0.024 (0.021‑0.027)
0.033 (0.028‑0.037)
0.039 (0.033‑0.045)
0.047 (0.040‑0.054)
0.052 (0.045‑0.060)
0.058 (0.049‑0.067)
0.064 (0.053‑0.074)
0.074 (0.060‑0.087)
0.084 (0.067‑0.100)
3-day 0.013 (0.011‑0.014)
0.017 (0.014‑0.019)
0.023 (0.020‑0.026)
0.027 (0.023‑0.031)
0.033 (0.028‑0.037)
0.037 (0.031‑0.042)
0.041 (0.034‑0.047)
0.044 (0.037‑0.051)
0.051 (0.042‑0.059)
0.056 (0.046‑0.067)
4-day 0.010 (0.009‑0.011)
0.013 (0.011‑0.015)
0.018 (0.015‑0.020)
0.021 (0.018‑0.024)
0.025 (0.022‑0.029)
0.029 (0.025‑0.032)
0.032 (0.027‑0.036)
0.035 (0.030‑0.040)
0.039 (0.033‑0.045)
0.042 (0.035‑0.051)
7-day 0.006 (0.005‑0.007)
0.008 (0.007‑0.009)
0.011 (0.010‑0.013)
0.014 (0.012‑0.015)
0.016 (0.014‑0.018)
0.018 (0.016‑0.021)
0.020 (0.017‑0.023)
0.022 (0.019‑0.025)
0.024 (0.021‑0.028)
0.026 (0.022‑0.030)
10-day 0.005 (0.004‑0.005)
0.006 (0.006‑0.007)
0.009 (0.008‑0.010)
0.010 (0.009‑0.012)
0.012 (0.011‑0.014)
0.014 (0.012‑0.015)
0.015 (0.013‑0.017)
0.016 (0.014‑0.019)
0.018 (0.015‑0.021)
0.019 (0.016‑0.022)
20-day 0.003 (0.002‑0.003)
0.004 (0.003‑0.004)
0.005 (0.004‑0.006)
0.006 (0.005‑0.007)
0.007 (0.006‑0.008)
0.008 (0.007‑0.009)
0.009 (0.008‑0.010)
0.010 (0.008‑0.011)
0.011 (0.009‑0.013)
0.012 (0.010‑0.013)
30-day 0.002 (0.002‑0.002)
0.003 (0.002‑0.003)
0.004 (0.003‑0.004)
0.005 (0.004‑0.005)
0.006 (0.005‑0.006)
0.006 (0.006‑0.007)
0.007 (0.006‑0.008)
0.008 (0.007‑0.009)
0.009 (0.007‑0.010)
0.010 (0.008‑0.011)
45-day 0.001 (0.001‑0.002)
0.002 (0.002‑0.002)
0.003 (0.003‑0.003)
0.004 (0.003‑0.004)
0.004 (0.004‑0.005)
0.005 (0.004‑0.006)
0.006 (0.005‑0.007)
0.006 (0.005‑0.007)
0.007 (0.006‑0.008)
0.008 (0.006‑0.009)
60-day 0.001 (0.001‑0.001)
0.002 (0.001‑0.002)
0.002 (0.002‑0.003)
0.003 (0.003‑0.003)
0.004 (0.003‑0.004)
0.004 (0.004‑0.005)
0.005 (0.004‑0.006)
0.006 (0.005‑0.006)
0.006 (0.005‑0.007)
0.007 (0.006‑0.008)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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PF graphical https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.2637&lon=-116.0029&data=intensity&units=english&series=pds 2/4
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Maps & aerials
Small scale terrain https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.2637&lon=-116.0029&data=intensity&units=english&series=pds 3/4
Large scale terrain
Large scale map
Large scale aerial
3km
2mi
100km
60mi
100km
60mi https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.2637&lon=-116.0029&data=intensity&units=english&series=pds 4/4
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US Department of Commerce National Oceanic and Atmospheric Administration
National Weather Service National Water Center
1325 East West Highway Silver Spring, MD 20910
Questions?: HDSC.Questions@noaa.gov
Disclaimer
100km
60mi
CA/NV STATE LINE
BOB RUUD MEMORIAL HIGHWAY
1.1
1.2
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
BOB RUUD MEMORIAL HIGHWAY
BASIN MAP (WEST ALIGNMENT)
FIGURE 1 OF 3
0 5,0002,500 Feet
O
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the
2319.1
16.1
19.2
23.1
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
BOB RUUD MEMORIAL HIGHWAY
BASIN MAP (MIDDLE ALIGNMENT)
FIGURE 2 OF 3
0 4,0002,000 Feet
O
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), and W BELL VISTA AVENUE ALIGNMENT
N L
E
SL
IE
S
T
N B
LA
G
G R
D
ST
EP
H
AN
IE
R
D
W SIMKINS RD
W MESQUITE AVE
UV160
UV160
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
BOB RUUD MEMORIAL HIGHWAY
BASIN MAP (EAST ALIGNMENT)
FIGURE 3 OF 3
0 4,0002,000 Feet
O
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Technical Note TN 2.04 Minimum and Maximum Cover Heights for HP Storm Pipe for Storm Drainage
Introduction The information in this document is designed to provide answers to general cover height questions; the data provided is not intended to be used for project design. The design procedure described in the Structures section (Section 2) of the Drainage Handbook provides detailed information for analyzing most common installation conditions. This procedure should be utilized for project specific designs.
The two common cover height concerns are minimum cover in areas exposed to vehicular traffic and maximum cover heights. Either may be considered "worst case" scenario from a loading perspective, depending on the project conditions.
Minimum Cover in Traffic Applications Pipe diameters from 12- through 48-inch (300-1200 mm) installed in traffic areas (AASHTO H-20, H-25, or HL-93 loads) must have at least one foot (0.3m) of cover over the pipe crown, while 60-inch (1500 mm) pipes must have at least 24 inches (0.6m) of cover. The backfill envelope must be constructed in accordance with the Installation section (Section 5) of the Drainage Handbook and the requirements of ASTM D2321. The backfill envelope must be of the type and compaction listed in Appendix A-5, Table A-5-2 of the Drainage Handbook. In Table 1 below, this condition is represented by a Class III material compacted to 95% standard Proctor density or a Class II material compacted to 90% standard proctor density, although other material can provide similar strength at slightly lower levels of compaction.
Structural backfill material should extend to the crown of the pipe; the remaining cover should be appropriate for the installation and as specified by the design engineer. If settlement or rutting is a concern, it may be appropriate to extend the structural backfill to grade. Where pavement is involved, sub-base material can be considered in the minimum burial depth. While rigid pavements can be included in the minimum cover, the thickness of flexible pavements should not be included in the minimum cover.
Additional information that may affect the cover requirements is included in the Installation section (Section 5) of the Drainage Handbook. Some examples of what may need to be considered are temporary heavy equipment, construction loading , paving equipment and similar loads that are less than the design load, the potential of pipe flotation, and the type of surface treatment which will be installed over the pipe zone.
Table 1 Minimum Cover Requirements for ADS HP Storm with AASHTO H-25, H-20, or HL-93 Load
Inside Diameter, ID, in.(mm)
Minimum Cover
ft. (m)
Inside Diameter, ID, in.(mm)
Minimum Cover
ft. (m)
12 (300) 1 (0.3) 36 (900) 1 (0.3) 15 (375) 1 (0.3) 42 (1050) 1 (0.3) 18 (450) 1 (0.3) 48 (1200) 1 (0.3) 24 (600) 1 (0.3) 60 (1500) 2 (0.6)
Notes:
1. Minimum covers presented here were calculated assuming Class III backfill material compacted to 95% standard Proctor density or Class II backfill material compacted to 90% standard Proctor density around the pipe, as recommended in Section 5 of the Drainage Handbook, with an additional layer of compacted traffic lane sub-base for a total cover as required. In shallow traffic installations, especially where pavement is involved, a good quality compacted material to grade is required to prevent surface settlement and rutting.
2. The minimum covers specified do not include pavement thickness. A pavement section of 0.4’ is typical.
3. Backfill materials and compaction levels not shown in the table may also be acceptable. Contact ADS for further detail.
4. Calculations assume no hydrostatic pressure and native soils that are as strong as the specified minimum backfill recommendations.
Maximum Cover Wall thrust generally governs the maximum cover a pipe can withstand and conservative maximum cover heights will result when using the information presented in the Structures section (Section 2) of the Drainage Handbook. Table 2 below shows the material properties consistent with the expected performance characteristics for HP Storm materials for a 100-year design life.
The maximum burial depth is highly influenced by the type of backfill and level of compaction around the pipe. General maximum cover limits for ADS HP Storm use in storm drainage applications are shown in Tables 3 for a variety of backfill conditions.
Table 3 was developed assuming pipe is installed in accordance with ASTM D2321 and the Installation section (Section
5) of the Drainage handbook. Additionally, the calculations assume no hydrostatic load around the pipe, incorporate the maximum conservative AASHTO LRFD design factors represented in Structures section of the Drainage Handbook, use material properties consistent with the expected performance characteristics for HP Storm materials, as shown in Table 2, and assume the native (in-situ) soil is of adequate strength and suitable for installation. For applications requiring fill heights greater than those shown in Table 3 or where hydrostatic pressure due to groundwater is expected, contact an ADS Engineer.
Table 2 ADS HP Storm Mechanical Properties
Resin ASTM Specification
Allowable Long Term
Strain %
Initial 75-Year Fu
(psi) E
(psi) Fu
(psi) E
(psi) Polypropylene, Impact-modified copolymer
ASTM F2881 3.7 3,500 175,000 1,000 28,000
Figure 1
ADS HP Storm Pipe Trench Detail with Uniform Backfill (Traffic and Non-Traffic Applications)
MIN TRENCH WIDTH
4" FOR 12"-24" PIPE
6" FOR 30"-60" PIPE
COVER TO
RIGID PAVEMENT, H
COVER TO
FLEXIBLE PAVEMENT, H
HAUNCH
INITIAL
BACKFILL
FINAL
BACKFILL
BEDDING
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FOUNDATION
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NEW CULVERT 1.1
(STA 318+07)
BOB RUUD MEMORIAL HIGHWAY
NEW CULVERT 1B
(STA 311+01)
NEVADA
CALIFORNIA
EXISTING CULVERT 1
(STA 301+18)
1.1
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
BOB RUUD MEMORIAL HIGHWAY
NEW CULVERT LOCATIONS
FIGURE 1 OF 3
0 400200 Feet
O
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the
LEGEND
WATERSHED BOUNDARY
PROPOSED CULVERT
PROJECT ALIGNMENT
FLOW ARROW (EXISTING)
FLOW ARROW (PROPOSED)
(STA 301+23)
(STA 301+00)
(STA 301+18)
NEW CULVERT 1.2
(STA 446+12)
1 1.2
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
BOB RUUD MEMORIAL HIGHWAY
NEW CULVERT LOCATIONS
FIGURE 2 OF 3
0 400200 Feet
O
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the
LEGEND
WATERSHED BOUNDARY
PROPOSED CULVERT
PROJECT ALIGNMENT
FLOW ARROW (EXISTING)
FLOW ARROW (PROPOSED)
16.1
NEW CULVERT 16.1
(STA 806+80)
NEW CULVERT 19.1
(STA 833+20)
NEW CULVERT 19.2
(STA 841+49)
EXISTING CULVERT 17
(STA 815+45)
EXISTING CULVERT 18
(STA 820+58)
EXISTING CULVERT 19
(STA 825+36)
EXISTING CULVERT 16
(STA 801+75)
16.1
19.1
19.2
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
BOB RUUD MEMORIAL HIGHWAY
NEW CULVERT LOCATIONS
FIGURE 3 OF 3
0 650325 Feet
O
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the
LEGEND
WATERSHED BOUNDARY
PROPOSED CULVERT
PROJECT ALIGNMENT
FLOW ARROW (EXISTING)
FLOW ARROW (PROPOSED)
(STA 806+94)
(STA 815+40)
(STA 820+52)
(STA 825+30)
(STA 833+24)
(STA 841+43)
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