Posts Tagged ‘fluvial geomorphology’

Join AWSMP for Praxis Conference on June 4

Posted on: May 12th, 2021 by Brent Gotsch
Roy Schiff, Prin­ci­pal Water Resources Engi­neer and Sci­en­tist with SLR.

Cor­nell Coop­er­a­tive Exten­sion of Ulster Coun­ty Stream Edu­ca­tor Tim Koch will team up with Roy Schiff of SLR Inter­na­tion­al (for­mer­ly Milone & Macb­room Inc) to present at the inau­gur­al Prax­is vir­tu­al con­fer­ence on June 4th. The Prax­is con­fer­ence focus­es on the prac­ti­cal appli­ca­tion of the­o­ry and research to improve com­mu­ni­ties. Tim and Roy, Prin­ci­pal Water Resources Engi­neer & Sci­en­tist with SLR, will present on a geo­mor­phic approach to cul­vert assess­ment and pri­or­i­ti­za­tion efforts in order to help com­mu­ni­ties mit­i­gate flood and ero­sion risks. Roy was involved with the research and devel­op­ment of a geo­mor­phic assess­ment tool. Tim has inte­grat­ed the tool into a Mul­ti-Objec­tive Stream Cross­ing Assess­ment Pro­to­col (MOSCAP) used to assess and pri­or­i­tize over 1,000 cul­verts and bridges through­out Ulster Coun­ty, New York. Their pre­sen­ta­tion and break-out ses­sion will focus on the research-based devel­op­ment of the tool, imple­men­ta­tion of the MOSCAP in Ulster Coun­ty, and infor­ma­tion on how peo­ple can imple­ment MOSCAP in their communities.

Tim Koch, Stream Edu­ca­tor with Cor­nell Coop­er­a­tive Exten­sion of Ulster Coun­ty and the Ashokan Water­shed Stream Man­age­ment Program
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Monday’s Bankfull Flows

Posted on: December 4th, 2020 by Tim Koch

Mon­day Novem­ber 30th, 2020 was a rainy day in the Ashokan water­shed. A home rain gauge in Boiceville mea­sured approx­i­mate­ly 4 inch­es over the course of the day. 

In response to the sig­nif­i­cant pre­cip­i­ta­tion the Beaver Kill, Lit­tle Beaver Kill, Bushkill, and Eso­pus Creek at Cold Brook reached bank­full dis­charge. Bank­full dis­charge is the stream flow that com­plete­ly fills the chan­nel in a geo­mor­phi­cal­ly sta­ble stream. Any flow that exceeds bank­full will put water onto the adja­cent floodplain. 

Cross sec­tion of a geo­mor­phi­cal­ly sta­ble stream where the entire chan­nel is filled dur­ing a bank­full flow.

Streams that have berms or lev­ees, are incised, or oth­er­wise unsta­ble do not have such a clear rela­tion­ship between bank­full dis­charge and chan­nel geometry.

In the North­east, a bank­full or greater flow hap­pens once every 1.5 years, on aver­age. How­ev­er, “on aver­age” means that some years see mul­ti­ple bank­full events while oth­ers have none. Mon­day’s event was the sec­ond time in 2020 that the Lit­tle Beaver Kill has equaled or exceed­ed its bank­full dis­charge of 909 cubic feet per sec­ond (cfs).

2020 Hydro­graph of the Lit­tle Beaver Kill. From USGS.

Bank­full flow events are impor­tant because over time, these flows move more sed­i­ment than any oth­er dis­charge, larg­er or small­er. This is because bank­full flows hap­pen reg­u­lar­ly, every 1.5 years on aver­age, as opposed to big floods that move a lot of sed­i­ment but are more infrequent. 

Due to the geo­mor­phic impor­tance of bank­full dis­charge events, the AWSMP reg­u­lar­ly vis­its stream restora­tion sites, cul­vert replace­ment projects, and oth­er stream reach­es fol­low­ing bank­full events to take pho­tographs and mon­i­tor any changes observed in the channel. 

AWSMP staff from the Ulster Coun­ty Soil & Water Con­ser­va­tion Dis­trict inspect a restora­tion site on Wood­land Creek fol­low­ing a bank­full flow in Novem­ber 2019. Pho­to by Tim Koch.

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New Video on Stream Channel Stability

Posted on: May 6th, 2020 by Tim Koch

The AWSMP office might be phys­i­cal­ly closed, but our edu­ca­tion staff have been hard at work gen­er­at­ing online stream based con­tent for both youth and adults.

AWSMP Educators Matt Savatgy, Brent, Gotsch, Tim Koch, and Amanda Cabanillas.

AWSMP Edu­ca­tors (from left to right) Matt Savat­gy, Brent Gotsch, Tim Koch, and Aman­da Caban­il­las dur­ing a snow­shoe stream walk in 2019.

 

AWSMP Stream Edu­ca­tor Tim Koch has just released a new video on stream chan­nel sta­bil­i­ty: what it is, and why it is impor­tant to main­tain and improve the sta­bil­i­ty of our rivers and streams. This 9‑minute video is meant for landown­ers, munic­i­pal offi­cials, con­ser­va­tion advi­so­ry coun­cil mem­bers, and any­one else inter­est­ed in or involved in stream management.

 

This video can also be viewed direct­ly from AWSM­P’s YouTube Chan­nel.

AWSMP Water­shed Youth Edu­ca­tor Matt Savat­gy and Pro­gram Assis­tant Aman­da Caban­il­las are cur­rent­ly pro­duc­ing a series of edu­ca­tion­al videos and at-home activ­i­ties for stu­dents. Fol­low along at home as they dis­cuss dif­fer­ent types of rocks, assess a cul­vert, and inves­ti­gate stream fea­tures in a chan­nel cross-section.

 

Screenshot of CCE Ulster Youth Education Video Series Website

Screen­shot of CCE Ulster Youth Sci­ence Edu­ca­tion Video Series Website

 

The online sci­ence series can be found at the Cor­nell Coop­er­a­tive Exten­sion of Ulster Coun­ty web­site and on the AWSMP web­site under Videos.

Check back with us in the com­ing weeks, espe­cial­ly if you are a stream­side landown­er or own prop­er­ty in the Spe­cial Flood Haz­ard Area as Resource Edu­ca­tor Brent Gotsch will be pro­duc­ing a series of short videos on flood­plains, flood­proof­ing, and all things flood insur­ance. In these upcom­ing videos, Brent will teach view­ers how to read a flood insur­ance rate map (FIRM) and the work­ings of the Nation­al Flood Insur­ance Pro­gram (NFIP) among oth­er flood relat­ed topics.

As always, our edu­ca­tion and tech­ni­cal staff are avail­able to answer any stream, flood­plain, or ripar­i­an buffer relat­ed ques­tions! Call the AWSMP office main line at (845) 688‑3047 for assis­tance or email info@ashokanstreams.org.

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Acclaimed Scientist to discuss Stream Management in the Catskills

Posted on: October 11th, 2019 by Brent Gotsch

Dave Rosgen, Ph.D. teaches a class about fluvial geomorphology.

Dave Ros­gen, Ph.D. teach­es a class about flu­vial geomorphology.

 

The New York City Depart­ment of Envi­ron­men­tal Pro­tec­tion (NYC DEP) will host a pub­lic lec­ture by Dave Ros­gen, Ph.D., who is wide­ly regard­ed as one of the fore­most stream man­age­ment experts in the world. His talk, “Liv­ing with Moun­tain Rivers in a Chang­ing Cli­mate” will focus on mak­ing riv­er com­mu­ni­ties resilient to more fre­quent flood­ing as a result of cli­mate change. He will share best man­age­ment prac­tices for riv­er man­age­ment includ­ing his approach to riv­er restora­tion known as Nat­ur­al Chan­nel Design. This approach works with the nat­ur­al ten­den­cies of rivers to reach equi­lib­ri­um with­in the land­scape they pass through.

Ros­gen is a pro­fes­sion­al hydrol­o­gist and geo­mor­phol­o­gist with 49 years of expe­ri­ence work­ing in rivers. He has designed and imple­ment­ed more than 70 large scale riv­er restora­tion projects. His work has been fea­tured in nation­al pub­li­ca­tions such as Nation­al Geo­graph­ic and the New York Times and he has authored more than five dozen reports, jour­nal arti­cles and fed­er­al agency man­u­als and books. He has taught short cours­es in water­shed man­age­ment and riv­er restora­tion for riv­er man­agers through­out the coun­try for the past 25 years.

Since the mid-1990s, DEP has pro­vid­ed near­ly $200 mil­lion to fund restora­tion of near­ly 50 miles of stream in the Catskills, includ­ing more than 400 indi­vid­ual projects. The projects, many of which have used Ros­gen’s meth­ods, are coor­di­nat­ed through unique part­ner­ships with local agen­cies. In Ulster Coun­ty, this is done through the Ashokan Water­shed Stream Man­age­ment Pro­gram (AWSMP) which is a part­ner­ship between Cor­nell Coop­er­a­tive Exten­sion of Ulster Coun­ty and the Ulster Coun­ty Soil and Water Con­ser­va­tion Dis­trict. These col­lab­o­ra­tions have yield­ed wide-rang­ing ben­e­fits to local com­mu­ni­ties and to water quality.

The talk will be held at the Over­look Lodge of Bel­leayre Moun­tain, 181 Gal­li Cur­ci Road in High­mount, NY on Octo­ber 21, from 7:00–9:00pm. It is free of charge and open to the pub­lic. Space is lim­it­ed and reg­is­tra­tion is encouraged.

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