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<br />002115 <br /> <br />2.1.1 <br /> <br />Dike West of Del Norte <br /> <br />Concern: <br /> <br />The dike on the south bank of the Rio Grande west of Del <br />Norte was partially breached during the peak of the flood. If <br />this dike were to fail, the town of Del Norte would sustain <br />considerable flooding, A request was made to evaluate its <br />overall condition, <br /> <br />Findings: <br /> <br />i~ <br />J; <br /> <br />This approximate 30 foot wide levee was part of a "Critical <br />Area 'l'reatment" (CAT) sponsored by the Soil Conservation Service <br />(SCS) in the late 1970's. The material for the heavily riprapped <br />bank and levee is reported to have corne from the Rio Grande Canal <br />Company (RGCC) quarry, which is nearby, The RGCC was apparently <br />the' entity that managed construction with SCS funding. The <br />diversion structure for the Rio Grande Canal is located <br />approximately 1 mile north east of the site. The headgate of the <br />Del Norte Town ditch is located at the upstream end of the CAT. <br />Leakage through the embankment near the headgate was observed <br />during the inspection. <br /> <br />Erosion over approximately a length of 350 feet on the top <br />of the bank has removed from 2 to 5 feet (average 4.0 feet) off <br />the top of the levee. Floating debris has accumulated on the top <br />of the bank, <br /> <br />The volume of material removed is estimated to be about <br />4 x 30 x 350 = 1556 cubic yards. <br />27 <br /> <br />Approximately half of the removed material appears to be <br />present on the site just east of the levee. <br /> <br />I~ approx. 350 -kei :r <br />- Zl 5' i <br /> <br />."~~-------------------~-------_.- - y <br />".' ,,,..~ ~ ' "".,.~ ~, ~ <br />',' p,..", l)c./ Non-c <br />.:t- /Ow,", Akh <br />. "....,..',"' <br /> <br />SECTION ALONG LEVEE <br /> <br />27 <br />