Question 1

Why do we need the Safe and Sound Stream Debris Removal Program?

Accepted Answer

Areas that experience flooding during major rain events may benefit from the removal of debris in nearby streams. Excess stream debris can cause localized flooding when constriction points along the stream become blocked by debris and cause a backup of water onto roads and other infrastructure. The most common constriction points are the undersides of bridges and culvert openings. Culverts are the pipes and concrete structures that carry streams under roads. When these blockages occur, the resulting flooding can create a threat to human safety, personal property, public infrastructure, and the environment.  Stream Corridor Assessments completed by S & S Planning and Design after the 2011 and 2016 floods in Ellicott City documented debris blockages as contributors to flooding and recommended that a debris management program be instituted.  Channel maintenance for debris has been ongoing on the Hudson Branch in Ellicott City since 2015 and is now being expanded in both geography and frequency. To minimize the risks associated with stream debris, Howard County is sending Howard EcoWorks into nine flood-prone streams after qualifying weather events to assess for accumulation of debris, determine what is appropriate to remove, and then remove debris that has the potential to contribute to localized flooding.

Question 2

What is stream debris?

Accepted Answer

In this context, stream debris is anything within the stream or immediately along its banks that threatens to move downstream during high flow events and has the potential to clog culverts or other constriction points, which can result in local flooding.  This may include logs, branches, trash and/or other bulk material.

Question 3

Where is stream debris being removed?

Accepted Answer

Debris is being assessed, and removed if needed, at dozens of sites on public properties and on Columbia Association property along nine Howard County streams. These sites have been chosen because they are locations that are known to experience, or contribute to, localized flooding.

Question 4

What if I see debris that could create a blockage in an area not covered by this program?

Accepted Answer

Please report such debris using the County’s “See, Click, Fix” application, linked here: https://en.seeclickfix.com/md_howard-county

Question 5

When is the debris removed?

Accepted Answer

Debris will be removed after any rain event of 2” or greater accumulation in a 24-hour period, or after an hour of sustained winds over 30mph. Within three business days of a qualifying wind or rain event, each of the locations will be inspected for accumulation of debris and need for removal. Within fourteen business days of the inspection, the material that was identified for removal during the inspection will be removed.

Question 6

Who is identifying and removing the debris?

Accepted Answer

Debris will be identified and removed by Howard EcoWorks or the County Bureau of Highways.

Question 7

Why don’t inspection crews remove debris immediately after identifying an accumulation?

Accepted Answer

Inspection results are analyzed before removing material because some locations may have a more immediate need for removal than others, based on stream conditions, threat to property or infrastructure and weather forecasts.

Question 8

Why are the results reported as “cubic yards of debris removed”?

Accepted Answer

While weight of debris could be used to track this effort, volume (the space that an object occupies) is what really causes backups at constriction points such as culverts and bridges. For example, while millions of tiny steel ball bearings may weigh more than all the woody debris removed from a stream, they would not cause as severe of a backup as less dense, but larger, woody debris. A cubic yard can be visualized by picturing a cube that is 3 feet long, by 3 feet wide, by 3 feet deep.  The bed of an average full size pickup truck, full but not piled higher than the edges of the bed, will hold 2.5 cubic yards of material.

Question 9

Why has the debris been left as a pile along the side of the road?

Accepted Answer

The County or Howard EcoWorks may need to temporarily stage debris along the side of the stream or road for later pickup due to vehicle availability and amount of debris. These piles will be removed within the fourteen business day timeframe that begins immediately following a significant wind or rain event. Click here to review a flow chart of the stream debris removal process.

Question 10

Why is debris being removed only from public property and CA property?

Accepted Answer

To begin this process as quickly as possible, public properties have been selected because access to private property relies on the permission of private landowners which often takes several months for the County to acquire. Pre-existing agreements between Columbia Association and Howard County provide the County with access to Columbia Association’s private parcels, without necessitating the process of acquiring permission to enter individual parcels.

Question 11

How will the County and Howard EcoWorks determine what debris to remove?

Accepted Answer

Priority debris for removal includes 1) debris within and immediately upstream of culverts or other areas of constriction, 2) debris that has the potential to mobilize during an event and create a blockage downstream and 3) debris that otherwise poses or may pose a risk to adjacent infrastructure.  Debris is typically composed of fallen trees and logs and may also contain smaller branches, overhanging branches and vines and trash / bulk material. Consideration for removal is given to the size of the debris relative to downstream constrictions, potential for the material to mobilize or create a hazard during a storm event and the location of the debris in stream bed or on the stream bank. The area of inspection is up to approximately bankfull elevation.  The bankfull elevation is the same as the ordinary high water mark (OHWM); in many channels this is the point where water begins to flow out onto its floodplain.  If stream banks are armored, live, overhanging branches

Retaining Ellicott City's Historic Charm

Retaining Ellicott City's Historic Charm

Retaining Ellicott City's Historic Charm

Retaining Ellicott City's Historic Charm

Retaining Ellicott City's Historic Charm

Retaining Ellicott City's Historic Charm

Capital Projects Tracker

Phase 2 NEW!

Phase 2 NEW!

Clearing the Waterways

Track Stream Inspections and Debris Removal

Click here to track stream inspections and debris after every major weather event!* Using the attached dashboard, you can also track the amount and type of debris removed from dozens of inspection points along 9 waterways.

*See FAQ's for description of major weather event.

Frequently Asked Questions

Clearing the Waterways

Track Stream Inspections and Debris Removal

Click here to track stream inspections and debris after every major weather event!* Using the attached dashboard, you can also track the amount and type of debris removed from dozens of inspection points along 9 waterways.

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*See FAQ's for description of major weather event.

Frequently Asked Questions