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<br />2.0 ARKANSAS RIVER BASIN <br /> <br />Hydrology data from designated and detailed floodplain reports within the CWCB floodplain <br />library were obtained and analyzed for the Arkansas River Basin. The Arkansas River basin was <br />divided into several subregions for the purpose of performing regional regression analyses. A <br />description of each subregion along with the associated regression equation and application criteria <br />are presented below. Figure 1.0, which graphically presents the regional and subregional <br />bOWldaries for the state, is located in the map pocket at the end of this report. <br /> <br />ARK-I: EASTERN PLAINS SUBREGION <br /> <br />This subregion includes stream reaches in the plains area of the Arkansas River basin. Some of the <br />streams in this subregion originate in the foothills or mountains. The subregion is bOWlded as <br />follows: <br /> <br />. On the south by the Colorado-New Mexico state line; <br />. On the east by the Colorado-Kansas state line; <br />. On the north by the Arkansas River-Republican River basin divide; <br />. And on the north by the Arkansas River-South Platte River basin divide; <br />. On the west (north of the Arkansas River mainstem) by the eastern basin boundary of the Chico <br />Creek/Black Squirrel Creek basin; <br />. On the west (south of the Arkansas River mainstern) by the basin divide between: <br />I, the Huerfano River basin <br />2. streams flowing into the Arkansas River east of its confluence with the Huerfano <br />River; and <br />. On the southwest by the basin divide between the following watersheds: <br />I. streams flowing into the Apishapa River upstream of and including Salado Creek <br />2. streams flowing into the Apishapa River downstream of its confluence with Salado <br />Creek; and <br />. And on the southwest by the basin divide between the following watersheds: <br />1. streams flowing into the Purgatoire River upstream of and including Trinchera <br />Creek <br />2. streams flowing into the Purgatoire River downstream of its confluence with <br />Trinchera Creek <br /> <br />The regression equation for this subregion is only valid for tributary streams that have drainage <br />areas between 25 mi2 and 1125 mi2. The mainstem of the Arkansas River is exempt from this <br />subregion. A detailed study or other hydrologic analysis must be performed for projects involving <br />Ihe Arkansas River mainstem or streams with drainage areas that fall outside of the applicable <br />range. For basins smaller than 25 mi2, refer to section 1.4 of this document. <br /> <br />9 <br />