Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/45425
Title: Flowering rush control in hydrodynamic systems : part 1 : water exchange processes
Authors: Sartain, Bradley T.
Getsinger, Kurt D.
Walter, Damian J.
Madsen, John Douglas
Levoy, Shayne
Keywords: Aquatic plants
Invasive plants
Aquatic herbicides
Butomus umbellatus
Flowering rush
McNary Lock and Dam (Or.)
Publisher: Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/EL TR-22-12
Abstract: In 2018, field trials evaluated water-exchange processes using rhodamine WT dye to provide guidance on the effective management of flowering rush (Butomus umbellatus L.) at McNary Dam and Reservoir (Wallula Lake, 15,700 ha). Additional evaluations determined the effectiveness of BubbleTubing (hereafter referred to as bubble curtain) at reducing water exchange within potential flowering rush treatment areas. Dye readings were collected from multiple sampling points at specific time intervals until a dye half-life could be determined. Whole-plot dye half-lives at sites without bubble curtain ranged 0.56–6.7 h. In slower water-exchange sites (≥2.6 h dye half-life), the herbicide diquat should have a sufficient contact time to significantly reduce flowering rush aboveground biomass. Other sites demonstrated very rapid water exchange (<1.5 h dye half-life), likely too rapid to effectively control flowering rush using chemical treatments without the use of a barrier or curtain to slow water exchange. At one site, the use of the bubble curtain increased the dye half-life from 3.8 h with no curtain to 7.6 and 7.1 h with a bubble curtain. The bubble curtain’s ability to slow water exchange will provide improved chemical control and in-crease the potential for other chemical products to be effectively used.
Description: Technical Report
Rights: Approved for Public Release; Distribution is Unlimited
URI: https://hdl.handle.net/11681/45425
http://dx.doi.org/10.21079/11681/45425
Appears in Collections:Technical Report

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