Abstract
ABSTRACT: Floodwater‐retarding impoundments, controlling 68 percent of the drainage area of Tonkawa Creek, a Washita River tributary in southwestern Oklahoma, have reduced the total flow volume about 36 percent over a 5‐year period. Analyses showed the reduction occurred primarily in the less‐than‐2.5‐cfs flow range, indicating the base flow regime has been altered. However, channelizing the downstream, mild‐sloped, 3.6 miles of Tonkawa Creek that flows across a Washita River terrace increased the flow volume fourfold at the outlet. A double‐masscurve analysis of water yield from a 1,127‐square‐mile Washita basin segment versus an untreated tributary showed the yield has not changed after 25 percent of the tributary area had been treated. Therefore, the flow reduction caused by structures is being offset by increased yields from channelization.
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