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  Archived Posts From: 2017

Re-Engineering Nature in Delaware Tax Ditches

Written on: May 22nd, 2017 in Wetland Restorations

Guest Writer: Melissa Hubert, DNREC’s Drainage Program

Fun fact, did you know that there are 234 tax ditch organizations scattered across Delaware that provide water management services to over 100,000 residents and nearly half of the state-maintained roads?

These watershed based organizations are responsible for maintaining over 2,000 miles of ditch channel to ensure the drainage functionality of these systems stays running strong. This is no easy feat considering most tax ditches were constructed over 30 years ago when the landscape across Delaware looked much different. The aging infrastructure of most tax ditches in conjunction with landuse changes have resulted in major maintenance concerns that need to be addressed.

Conditions of the Bridgeville Branch Tax Ditch channel before the stream restoration project. Note the straight channel.

Conditions of the Bridgeville Branch Tax Ditch channel before the stream restoration project. Note the straight channel.

As these engineered systems attempt to handle stormwater flows that they were not designed for, the ditch channels often undergo changes caused by moving water that deepen and widen the channels, cause bank erosion, and create sediment bars. These side-effects change the ditch systems from their original designs which in turn, may limit their water capacity, decrease response time to storm events, and make it more difficult to perform channel maintenance.

Bridgeville Branch Tax Ditch channel after the stream restoration project was completed. Note the meander of the channel, which is similar to the flow of natural streams

Bridgeville Branch Tax Ditch channel after the stream restoration project was completed. Note the meander of the channel, which is similar to the flow of natural streams

The DNREC Drainage Program is working with tax ditch organizations to determine ways to mimic natural in-stream processes and features with the goal of minimizing maintenance needs while still enhancing the ability of these systems to transport and clean water.

Here’s an example of one of those projects:

A portion of the Bridgeville Branch Tax Ditch, located in the Town of Bridgeville, was undercutting and widening to the point that both a sanitary sewer and water line were exposed within the channel. For a permanent solution to this serious issue, the exposed lines were properly encased and a channel that mimics a natural stream was constructed to further protect and enhance the project area.

Soil lifts with live branch cutings placed between each layer to protect this bend where the sanitary sewer line is located and improve in-stream habitat.

Soil lifts with live branch cutings placed between each layer to protect this bend where the sanitary sewer line is located and improve in-stream habitat.

Natural streams transport water through the path of least resistance and as a result, many twists and turns tend to develop as water moves. For this project the ditch channel was re-aligned to establish a meandering flow path with adjacent floodplain benches to reduce the energy moving through the channel during normal and higher storm flow conditions.

In addition a stilling basin was constructed just downstream of four large pipes to slow the water when it entered the project area. A series of riffle and pool structures were created to provide flow diversity within the channel. These features not only reduce future maintenance needs, but capture and prevent pollutants from being transported further downstream, and create spawning habitat for all those critters we love.

The live branch cuttings really taking off providing bank stabilization, wildlife cover, and shade for the channel.

The live branch cuttings really taking off providing bank stabilization, wildlife cover, and shade for the channel.

Tree logs and root wads were pushed into the banks to provide natural protection from erosion as well as wildlife habitat and cover. Soil lifts or soils wrapped in an organic material were installed with branches placed between each lift to restore a portion of the ditch bank that was previously lost to erosion.

Last but not least the entire project area was planted with native species of riparian grasses, trees, and shrubs with live branch cuttings planted on the banks to rapidly establish stability, shade, and in-stream cover.

In this project nature was re-engineered by implementing natural design techniques and features that not only improved the functionality of the tax ditch channel and reduced future maintenance needs but also enhanced wildlife habitat and water quality.

It is the DNREC Drainage Program’s hope to help tax ditch organizations plan and construct stream restoration projects like this one to address maintenance issues in the future.

Delaware Tax Ditch Map

Visit this site to see where tax ditches are located near you.

Interested in getting involved? Tax ditch meetings are held annually, organized by watershed, to voice maintenance concerns and other topics. Any decisions are voted on by property owners within their own tax ditch watershed. With the prevalence of tax ditch organizations across Delaware you may even live in a watershed that has one. Check out this app to find out.


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Shoreline Stabilization Solutions for You!

Written on: May 22nd, 2017 in Living Shorelines

Where to Begin and an Expedited Permitting Process.

Guest Writers: Julie Molina, Katie Huegel and Matt Jones of DNREC’s Wetlands & Subaqueous Lands Section

Armored Living Shoreline

Pictured above is an armored living shoreline used in a high energy area. The project stabilized 150 linear feet of shoreline using a marsh toe sill with coir fiber logs and wetland vegetation planted behind the sill.

Delaware’s coastal communities face constant challenges from shoreline erosion. Historically, tidal wetlands act as the natural solution for shoreline stabilization. Tidal wetlands provide protection against shoreline erosion, a mechanism for flood control and natural habitat for many plant and animal species. Coastal communities today can still take advantage of having a natural means to stabilize their shorelines!

Having a natural, “living” shoreline is an increasingly popular option that provides a variety of ecological benefits while also serving a homeowner’s main goal of erosion control. For those with an interest in fishing and crabbing, the regaining of this critical riparian habitat has been proven to almost double the densities of these creatures when compared to bulkhead or riprap.

So what’s the next step?

Lewes Living Shoreline

Pictured above is a non-structural living shoreline in a low energy area. The project stabilized 84 linear feet of shoreline using coir fiber logs and wetland vegetation.

There are many different designs used when installing a living shoreline. From using coir fiber logs, to oyster castles, to a marsh toe sill with wetland plantings – the possibilities are endless. Since every shoreline is different, a site-specific design is required for successful results. Getting in contact with a consultant or contractor in order to determine which type of living shoreline would work for your property is an important next step. You can reach a consultant or contractor specializing in vegetative shoreline stabilization techniques here.

The Wetlands and Subaqueous Lands Section at DNREC has an expedited permitting process to authorize the construction of these natural living shorelines.

As long as the project meets the parameters outlined here, the Statewide Activity Approval for Shoreline Stabilization Projects can be used by coastal community residents to naturally protect their shoreline. For more information on natural living shorelines, please contact our office at (302) 739-9943.


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Delaware Wetland Management & Assessment Program

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