Assessment Crew Heads to the Field

Posted on: June 17th, 2014 by Leslie_Zucker

This week the AWSMP stream assess­ment crew will be out sur­vey­ing past stream restora­tion projects to mon­i­tor their per­for­mance. The crew uses sur­vey instru­ments to deter­mine whether the cross-sec­tion­al shape and lon­gi­tu­di­nal pro­file of the stream chan­nel have changed dur­ing recent storms. The crew estab­lish­es an accu­rate ele­va­tion, stretch­es a mea­sur­ing tape across the stream from bank to bank, and then uses a rod to mea­sure the depth to the stream bot­tom every foot or so. For a lon­gi­tu­di­nal pro­file, the mea­sure­ments are tak­en down the mid­dle of the stream chan­nel. The crew mea­sures the length and depth of chan­nel rif­fles and pools as they trav­el down­stream. The results are plot­ted and com­pared to past sur­veys to mea­sure chan­nel response and the abil­i­ty of project designs to main­tain sta­bil­i­ty. The data col­lect­ed will pro­vide valu­able infor­ma­tion for future restora­tion designs.