Driveway Culcert Desgin.jpgCivil v
Solutions, 1 0.
Mark Bolander Driveway Culvert
Lot 4 Valley Ridge Estates
Blair, NE
PROJECT UNDERSTANDING
16439 Briar Street
Omaha, NE 68136-4154
402-895-5633
Mark Bolander is planning on building a house on Lot 4 Valley Ridge Estates in Blair, NE.
The City of Blair, NE requires that driveway culverts be sized to carry the 50 -yr storm event.
The drainage analysis for the existing site conditions was completed using the Win TR -55 Small
Watershed Hydrology program developed by the Natural Resources Conservation Service
(NRCS). The pipe size was determined from the Manning's Equation for Pipe Flow.
PROPOSED SITE CONDITIONS
Total area: 1.7 acres
Approximately 1 -acre size lots with 20% impervious area
Q50: 6.7 cfs
RECOMMENDATIONS
The north ditch of Clark Street appears to slope at approximately 11.0%. This was determined
from the GIS Contours provided by the City of Blair.
Install a 15" Dia. Reinforced Concrete Pipe (RCP) under the driveway to match the street ditch.
At that slope, it has the capacity to handle 24 cfs. Installation of the culvert should follow the
following guidelines:
1. One foot minimum cover between the top of pipe and the top of the driveway.
2. Flared end sections should be installed at the inlet and outlet ends of the culvert pipe.
3. Keep excavations at a minimum to avoid having bare soil areas that may be prone to
erosion. Grass needs to be established as soon as possible after installation. Watch the
outlet for signs of ditch erosion. It may be necessary to install erosion protection in the
ditch.
ATTACHMENTS
No. 1 — Drainage Area Plan
No. 2 - Soil Description of the Site
No. 3 - Drainage Analysis for Proposed Site Conditions (7 pages)
No. 4 — Manning's Equation for Pipe Flow.
9/17/2019
www.civsolutions.com
Allen Schoemaker
To: Mark Bolander
Subject: RE: Bolander Drive
Mar & Lori,
I have approved the design you provided to me by Civil Solutions. I will give a copy of the approved design to the Blair
building department for their inspector to confirm the culvert installation is per the engineer's design.
Let me know if there are any questions.
Ae.gAwm44n, PWLF
Director of Public Works
City of Blair, Nebraska
402-426-4191
ARS@blairnebraska.org
From: Mark Bolander <bolandermark@gmail.com>
Sent: Monday, September 23, 2019 11:28 AM
To: Allen Schoemaker <ars@blairnebraska.org>
Cc: Lori Bolander <lori.l.bolander@gmail.com>
Subject: Bolander Drive
Al:
Please find the attached study, for our building site @ Lot #4 - Valley Ridge Estates, in Blair, NE.
We coordinated with Dan Norman @ Civil Solutions ...... on this professional study. Please advise ono how we need to
proceed in obtaining our permit, with specifics of our driveway approval.
Thank you,
Mark & Lori Bolander
y
0.3 R of, pavement
1.4 ES(grass, trees)
A�WAW�"■►iI
41° 376'N
41° 311 11
Soil Map—Washington County, Nebraska
Attachment No. 3
Soil Description of the Site
(8 Pages)
737710 737741 737730 737740 73T733 737767 737770 737780 737790 737aM 737810 737841 737830
3 3
Map Smle: 1:595 f printed on A land—pe (11" x 8.7) 4 d -
N Meters
0 5 10 20 30
A0 25 50 100
I•lap projection: Vkb Mermtcr Comer coxTmt s: WCS94 Edge tics: U174 Zm 14N WGS84
usm Natural Resources Web Soil Survey 9/17/2019
Conservation Service National Cooperative Soil Survey Page 1 of 3
41° 723'11
Soil Map—Washington County, Nebraska
MAP LEGEND
MAP INFORMATION
Area of Interest (AOI)
gj
Spoil Area
The soil surveys that comprise your AOI were mapped at
0
Area of Interest (AOI)
d
Stony Spot
1:12,000.
Solis
w
Very stony Spot
Warning: Soil Map may not be valid at this scale.
Soil Map Unit Polygons
r,
Wet Spot
Enlargement of maps beyond the scale of mapping can cause
-0
Soil Map Unit Lines
misunderstanding of the detail of mapping and accuracy of soil
A
Other
line placement. The maps do not show the small areas of
Soil Map Unit Points
contrasting soils that could have been shown at a more detailed
Special
Point Features
Special Line Features
scale.
()
Blowout
Water Features
_
Streams and Canals
Please rely on the bar scale on each map sheet for map
Borrow Pit
measurements.
Transportation
X
Clay Spot
Rails
Sourceof Map: Natural Resources Conservation Service
1-a-1
Web Soil Survey URL:
(�
Closed Depression
,y
Interstate Highways
Coordinate System: Web Mercator (EPSG:3857)
x
Gravel Pit
r .+
US Routes
Maps from the Web Soil Survey are based on the Web Mercator
Gravelly Spot
Major Roads
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Landfill
Local Roads
Albers equal-area conic projection, should be used if more
CC
Lava Flow
accurate calculations of distance or area are required.
I4
Background
fir,
Marsh or swamp
.
Aerial Photography
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
�i
Mine or Quarry
Soil Survey Area: Washington County, Nebraska
0
Miscellaneous Water
Survey Area Data: Version 17, Sep 12, 2018
O
Perennial Water
Soil map units are labeled (as space allows) for map scales
.
Rock Outcrop
1:50,000 or larger.
+
Saline Spot
(s) aerial images were photographed: Feb 1, 2014—Nov
2Dat
• •
Sandy Spot
The orthophoto or other base map on which the soil lines were
Severely Eroded Spot
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
Sinkhole
shifting of map unit boundaries may be evident.
Slide or Slip
Sodic Spot
i W m Natural Resources Web Soil Survey 9/17/2019
Conservation Service National Cooperative Soil Survey Page 2 of 3
Soil Map—Washington County, Nebraska
Map Unit Legend
usDA Natural Resources Web Soil Survey 9/17/2019
Conservation Service National Cooperative Soil Survey Page 3 of 3
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
8008
Ida silt loam, 17 to 30 percent
slopes, eroded
1.4
78.3%
8142
Pohocco-Monona complex, 11
to 17 percent slopes, eroded
0.4
21.7%
Totals for Area of Interest
1.8
100.0%
usDA Natural Resources Web Soil Survey 9/17/2019
Conservation Service National Cooperative Soil Survey Page 3 of 3
Map Unit Description: Ida silt loam, 17 to 30 percent slopes, eroded ---Washington County,
Nebraska
Washington County, Nebraska
8008—Ida silt loam, 17 to 30 percent slopes, eroded
Map Unit Setting
National map unit symbol: 2sgr3
Elevation: 960 to 1,470 feet
Mean annual precipitation: 28 to 34 inches
Mean annual air temperature: 49 to 53 degrees F
Frost -free period. 155 to 175 days
Farmland classification: Not prime farmland
Map Unit Composition
Ida, eroded, and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Ida, Eroded
Setting
Landform: Loess hills
Landform position (two-dimensional): Shoulder, backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Convex
Across -slope shape: Convex
Parent material: Calcareous loess
Typical profile
Ap - 0 to 6 inches: silt loam
C - 6 to 79 inches: silt loam
Properties and qualities
Slope: 17 to 30 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: High
Capacity of the most limiting layer to transmit water (Ksat):
Moderately low to moderately high (0.14 to 1.42 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 14 percent
Salinity, maximum in profile: Nonsaline to very slightly saline (0.0
to 2.0 mmhos/cm)
Available water storage in profile: Very high (about 12.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6e
Hydrologic Soil Group: B
USDA Natural Resources Web Soil Survey 9/17/2019
Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description: Ida silt loam, 17 to 30 percent slopes, eroded ---Washington County,
Nebraska
Ecological site: Calcareous Loess Exposed Backslope Prairie
(R107BY006MO), Calcareous Loess Protected Backslope
Savanna (R107BY013MO)
Hydric soil rating: No
Minor Components
Monona, eroded
Percent of map unit: 10 percent
Landform: Loess hills
Landform position (two-dimensional): Shoulder, backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Convex
Across -slope shape: Convex
Ecological site: Deep Loess Exposed Backslope Savanna
(R107BY003MO)
Hydric soil rating: No
Steinauer, eroded
Percent of map unit: 5 percent
Landform: Loess hills
Landform position (two-dimensional): Shoulder, backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Convex
Across -slope shape: Convex
Ecological site: Calcareous Till Upland Prairie (R107BY0271A)
Hydric soil rating: No
Data Source Information
Soil Survey Area: Washington County, Nebraska
Survey Area Data: Version 17, Sep 12, 2018
USDA Natural Resources Web Soil Survey 9/17/2019
Conservation Service National Cooperative Soil Survey Page 2 of 2
Map Unit Description: Pohocco-Monona complex, 11 to 17 percent slopes, eroded ---
Washington County, Nebraska
Washington County, Nebraska
8142—Pohocco-Monona complex, 11 to 17 percent slopes,
eroded
Map Unit Setting
National map unit symbol. f8k4
Elevation: 1,000 to 1,500 feet
Mean annual precipitation: 28 to 30 inches
Mean annual air temperature: 50 to 54 degrees F
Frost -free period: 150 to 170 days
Farmland classification: Not prime farmland
Map Unit Composition
Pohocco, eroded, and similar soils: 57 percent
Monona, eroded, and similar soils: 40 percent
Minor components: 3 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Pohocco, Eroded
Setting
Landform: Loess hills
Landform position (two-dimensional):
Landform position (three-dimensional)
side slope
Down-slope shape: Convex
Across -slope shape: Convex
Parent material: Loess
Typical profile
Ap - 0 to 6 inches: silty clay loam
Bw - 6 to 15 inches: silt loam
Bk - 15 to 28 inches: silt loam
C - 28 to 80 inches: silt loam
Shoulder, backslope
Head slope, nose slope,
Properties and qualities
Slope: 11 to 17 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: High
Capacity of the most limiting layer to transmit water (Ksat):
Moderately high to high (0.60 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 10 percent
Available water storage in profile: High (about 11.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
USDA Natural Resources Web Soil Survey 9/17/2019
Niiiiiiiiiiiii Conservation Service National Cooperative Soil Survey Page 1 of 3
Map Unit Description: Pohocco-Monona complex, 11 to 17 percent slopes, eroded ---
Washington County, Nebraska
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: B
Ecological site: Silty - Veg. zone 4 (R107XY075NE), Calcareous
Loess Protected Backslope Forest (F107BY010MO),
Calcareous Loess Exposed Backslope Woodland
(Fl07BY011 MO)
Forage suitability group: Loam (G107BY100NE)
Hydric soil rating: No
Description of Monona, Eroded
Setting
Landform: Loess hills
Landform position (two-dimensional):
Landform position (three-dimensional)
head slope
Down-slope shape: Convex
Across -slope shape: Convex
Parent material: Fine -silty loess
Typical profile
Ap - 0 to 7 inches: silt loam
A - 7 to 15 inches: silt loam
Bw - 15 to 30 inches: silt loam
C - 30 to 60 inches: silt loam
Backslope, shoulder
Side slope, nose slope,
Properties and qualities
Slope: 11 to 17 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat):
Moderately high to high (0.60 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 25 percent
Available water storage in profile: High (about 12.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: B
Ecological site: Silty - Veg. zone 4 (R107XY075NE), Deep Loess
Exposed Backslope Savanna (R107BY003MO)
Forage suitability group: Not Suited (G10713Y000NE)
Hydric soil rating: No
Minor Components
Ida, eroded
Percent of map unit: 3 percent
Landform: Loess hills
Landform position (two-dimensional): Backslope
USDANatural Resources Web Soil Survey 9/17/2019
+ Conservation Service National Cooperative Soil Survey Page 2 of 3
Map Unit Description: Pohocco-Monona complex, 11 to 17 percent slopes, eroded ---
Washington County, Nebraska
Landform position (three-dimensional): Head slope, side slope,
nose slope
Down-slope shape: Convex
Across -slope shape: Convex
Ecological site: Limy Upland (R102CY059NE), Calcareous Loess
Upland Prairie (R107BY012MO)
Hydric soil rating: No
Data Source Information
Soil Survey Area: Washington County, Nebraska
Survey Area Data: Version 17, Sep 12, 2018
USDA Natural Resources Web Soil Survey 9/17/2019
+� Conservation Service National Cooperative Soil Survey Page 3 of 3
Attachment No. 3
Drainage Analysis for Proposed
Site Conditions (7 Pages)
WinTR-55 Current Data Description
--- Identification Data ---
User: Dan Date: 9/17/2019
Project: Bolander Property Units: English
SubTitle: 50 -YR Runoff for Driveway Culvert Areal Units: Acres
State: Nebraska
County: Washington
Filename: F:\Civil Solutions\Bolander Property\Driveway Culvert Size.w55
Name Description
---------------------------
Al Drainage Area
Total area: 1.70 (ac)
--- Sub -Area Data ---
Reach Area(ac)
--------------------------------
Outlet 1.7
RCN Tc
68 0.1
--- Storm Data --
Rainfall Depth by Rainfall Return Period
2 -Yr 5 -Yr 10 -Yr 25 -Yr 50 -Yr 100 -Yr
(in) (in) (in) (in) (in) (in)
----------------------
3.0 3.87 4.6 5.25 5.95 6.55
Storm Data Source: Washington County, NE (NRCS)
Rainfall Distribution Type: Type II
Dimensionless Unit Hydrograph: <standard>
1 -Yr
(in)
2.42
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Dan Bolander Property
50 -YR Runoff for Driveway Culvert
Washington County, Nebraska
Storm Data
Rainfall Depth by Rainfall Return Period
2 -Yr 5 -Yr 10 -Yr 25 -Yr 50 -Yr 100 -Yr 1 -Yr
(in) (in) (in) (in) (in) (in) (in)
-------------------------------------------------------------------------------
3.0 3.87 4.6 5.25 5.95 6.55 2.42
Storm Data Source:
Rainfall Distribution Type:
Dimensionless Unit Hydrograph
Washington County, NE (NRCS)
Type II
<standard>
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Dan Bolander Property
50 -YR Runoff for Driveway Culvert
Washington County, Nebraska
Watershed Peak Table
Sub -Area Peak Flow by Rainfall Return Period
or Reach 50 -Yr
Identifier (cfs)
-------------------------------------------------------
SUBAREAS
Al 6.74
REACHES
OUTLET 6.74
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Dan Bolander Property
50 -YR Runoff for Driveway Culvert
Washington County, Nebraska
Hydrograph Peak/Peak Time Table
Sub -Area Peak Flow and Peak Time (hr) by Rainfall Return Period
or Reach 50 -Yr
Identifier (cfs)
(hr)
----------------------------------------------------------------------------------
SUBAREAS
Al 6.74
11.94
REACHES
OUTLET 6.74
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Dan
Bolander Property
50 -YR Runoff
for Driveway Culvert
Washington
County, Nebraska
Sub -Area Summary Table
Sub -Area
Drainage
Time of
Curve Receiving Sub -Area
Identifier
Area Concentration
Number Reach Description
(ac)
(hr)
---------------------------------------------------------------------
Al
1.70
0.100
68 Outlet Drainage Area
Total Area:
1.70 (ac)
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Dan Bolander Property
50 -YR Runoff for Driveway Culvert
Washington County, Nebraska
Sub -Area Time of Concentration Details
Sub -Area
Flow
Mannings's
Identifier/
Length
Slope
n
(ft)
(ft/ft)
-----------------------------------------
Al
SHEET
25
0.3300
0.011
SHALLOW
100
0.0200
0.050
CHANNEL
440
End Wetted Travel
Area Perimeter Velocity Time
(sq ft) (ft) (ft/sec) (hr)
-------------------------------------
0.002
0.012
20.000 0.006
Time of Concentration 0.1
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Dan Bolander Property
50 -YR Runoff for Driveway Culvert
Washington County, Nebraska
Sub -Area Land Use and Curve Number Details
Sub -Area Hydrologic Sub -Area
Identifier Land Use Soil Area
Group (ac)
-------------------------------------------------------------------------
Al Residential districts (1 acre) B 1.7
Total Area / Weighted Curve Number 1.7
Curve
Number
68
68
WinTR-55, Version 1.00.10 Page 1 9/17/2019 3:39:34 PM
Attachment No. 4
Manning Formula Uniform Pipe Flow at Given Slope and Depth :J
Inputs:
Pipe Diameter, do
15.0000 in
Manning Roughness, n
0.0120
Pressure slope (possibly equal to pipe slopeLSoL
11.8200 % slope
Percent of (or ratio to) full depth (100% or 1 if flowing full)
1.0000 fraction
Results:
Flow, Q
24.0583 ft^3/s
Velocity, v
19.6045 ft/s
Velocity head, by
5.9732 ft
Flow Area, A
1.2272 ft^2
Wetted Perimeter, P
3.9270 ft
Hydraulic Radius
0.3125 ft
Top Width, T
0.0000 ft
Froude Number, F
0.00
Shear Stress (tractive force), r
9.22311 psf