Background and Problems Petitioned filed by Livingston County Drain - - PDF document

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ORCHARD PARK INTERCOUNTY DRAIN

Intercounty Drain Board and Public Meeting Wade Trim Inc. January 18, 2017

1

Purpose of Meeting

Background and Problems Drainage District Drain Design

Drain route Crossings Storage areas

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Background and Problems

Petitioned filed by Livingston County Drain

Commissioner in September 2015

Determined practical by Drain Board May 2016 No established drain within drainage district

currently

Orchard Park Retention Pond has no outlet Flooding in other areas within district

Orchard Park Detention Basin Flooding Frequency

In last 10 years, the basin flooded 4 times:

3/2006 4/2012 4/2013 5/2014

Basement floods once every 2.5 years It was close to flooding in 5/2015 and 5/2016 Based on above information, basin is assumed

to flood every 2-years (2-year storm)

Photo taken May 2014 by Craig Saddler

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Completed a field inspection of the potential position of the new drain Evaluated the existing culvert crossings Hydraulic analysis for proposed Developed recommendations for improvements Prepared opinion of construction costs

Survey and Design Process

What is the Drainage District?

Lands that contribute water runoff into the drain Serves as special assessment district

Drainage District for Orchard Park Drain includes:

Tyrone Township, Livingston County Fenton Township, Genesee County Landowners

Drainage District

Orchard Park Retention Basin

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Drain Design Process Data Collected

Aerial Photos

Landuse Conflicts with drain alignment

Local topography (2 foot contours) Recent field survey

Spot elevations Culvert sizes Existing drainage Possible drain alignment

Soil data

Drain Design Process Hydrologic and Hydraulic Analysis

Hydrology

25-year design storm for Main Drain (>300 acres) 25-year design storm for Orchard Park detention basin outlet 10-year design storm for East Branch (<300 acres) Flow information based on MDEQ methodology “Computing Flood

Discharges For Small Ungaged Watersheds”

MDEQ SCS peak discharge spreadsheet

Hydraulics

Hydraulic profiles developed using USACE HEC-RAS

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Drain Alignment Development

Horizontal and vertical drain alignment developed within the GIS

environment

Horizontal drain alignment intersected with surface model using GIS 3D

Spatial Analyst Tool to develop drain overbank elevations

Initial vertical drain profile developed within excel using the drain

• verbank elevation as a starting point

Proposed Drain Alignment

Legend

Orchard Park Drain

Proposed Culvert East Branch East Branch, Enclosed Existing Main Drain

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Main Drain Detail (Profile) System Overview East Drain Detail (Plan)

Red Line is enclosed drain Yellow Line is open channel with

crossing at Linden Road

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East Drain Detail (Profile)

3 ft 3.5 ft Orchard Park Detention Basin

Main Drain Potential North Storage

• Assume storage invert =

928 feet

• Storage depth of 930 feet

impacts parcels

• Excavation required to

develop storage volume

• Assumed not feasible

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South Storage

395 feet berm Provides 402,000 cf of storage Outlet diameter = 3 ft Max depth = 5.6 ft (893.6

feet)

28.7% peak reduction Decrease culvert 1 from 5.5 ft

to 5 ft

Berm Berm

Stage (ft) Cumulative Volume (cf) 2 55,769 4 178,176 6 402,426

Orchard Park Detention Basin Stage Storage

Elevation (feet) Cumulative Volume (cubic feet) 892 893 12,681 894 40,401 896 137,173 898 287,568 900 493,896

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Orchard Park Floor Elevations

Minimum basement elevation = 899.50 feet Maximum pond elevation = 898.50 feet

Preliminary Culvert Sizes

Culvert # Location Material Culvert Size (ft) 1 Bennett Lake Road Concrete Box 8’x3’ 2 Linden Road (North) Concrete Elliptical 5.7’x3.6’ 3 Lobdell Road Concrete Box 5’x3’ 4 Linden Road (South) RCP 3’ 1 2 3 4

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Drain Outlet

Outlet Pipe Drain Outlet

Work from one side of drain to excavate new drain Clearing and Grubbing of trees and brush within new drain rights-of-way

Maintenance road to be established along one drain bank for future maintenance

Construct stable side slopes from 2H:1V to 3H:1V (Horizontal:Vertical) Level spoil along drain banks

Remove within lawn areas

Open Channel Improvements

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Total Estimated Cost

$890,000 476 acres in drainage district

Cost Estimate at Preliminary Design Tentative Project Schedule

Submit plans

August…

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Questions and Comments