Posts Tagged ‘Beaver Kill’

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.

Share

AWSMP Invites Community to Stream Walk Along the Beaver Kill

Posted on: April 28th, 2016 by Brent Gotsch

The Ashokan Water­shed Stream Man­age­ment Pro­gram (AWSMP) invites you to attend a stream walk on Sat­ur­day, May 14 from 10:00am to 12:00pm along Mink Hol­low, a major trib­u­tary to the Beaver Kill in the Town of Woodstock.

Adam Doan of the Ulster Coun­ty Soil and Water Con­ser­va­tion Dis­trict will lead the hike on New York State For­est Pre­serve land, along a trail that runs adja­cent to the stream. Par­tic­i­pants will learn about nat­ur­al streams of the Catskills, their fea­tures, his­to­ry and man­age­ment. The focus of this inter­pre­ta­tive walk will be on how nat­ur­al process­es shape stream chan­nels and their flood­plains and how human inter­ven­tion can pro­mote chan­nel sta­bil­i­ty. Addi­tion­al top­ics may include the impor­tance of ripar­i­an buffers, the role that large woody debris plays in streams, aquat­ic insects as indi­ca­tors of stream health, and flood­plain man­age­ment. Time per­mit­ting, par­tic­i­pants will also learn more about a stream sta­bi­liza­tion project at the near­by Van Hoagland Bridge.

The event is free and open to all, but is lim­it­ed to 15 par­tic­i­pants. Please con­tact Brent Gotsch at 845–688-3047 ext. 3 or bwg37@cornell.edu to reg­is­ter. The trail is rel­a­tive­ly lev­el, though rocky and nar­row in sec­tions. There may be ample off-trail hik­ing, so please be sure to bring appro­pri­ate footwear and tick and mos­qui­to repel­lant. For the safe­ty and com­fort of all par­tic­i­pants we ask that pets stay at home.

Walk par­tic­i­pants will meet at the Mink Hol­low trail­head park­ing lot at the end of Mink Hol­low Road. Take Route 212 in Mount Trem­per, NY to Mink Hol­low Road in Lake Hill, NY. Turn left onto Mink Hol­low Road and fol­low road to its end (approx­i­mate­ly 3 miles from inter­sec­tion with Route 212).

 

Share