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<br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />* Appendix 2a, page 12 <br /> <br />3.2,4 DeBRP: Previouslv Exist. Conditions (EXIST-Ap~endix 2cl <br /> <br />The right overbank of Boulder Creek, or the DCBRP originally <br />consisted of a broad, flat floodplain extending from the <br />creek south to Colorado Avenue. The EXIST model was created <br />to show that flows which overtop the bikepath do in fact <br />become hydraulically disconnected, that is the energy grade <br />line for the two profiles is significantly different. This <br />model also provides a basis from which to evaluate flood <br />mitigation impacts. <br /> <br />Sections 13 through 16.1 were repeated from the Eouldcl.: <br />Creek model (BCSC). From the Base Section (16.1), the model <br />consists of the right overbank of sections 17, 19, 20, and <br />20,1 of the Boulder Creek model. This was done by encroaching <br />from the left to the right top of bank (X3.4), i,e., the left <br />overbank and main channel of these sections were considered <br />as ineffective flow for this model, leaving the right <br />overbank, or the UCBRP to convey the assigned flows (Fig. 6). <br />In this way, two parallel models were formed from the same <br />sections in order to maintain consistency with each other <br />(see Fig. 3a and b for water surface profiles). <br /> <br />Sections were then added to this model between the earlier <br />FHAD sections in order to more accurately define conditions. <br />Section 16.1 was encroached on the right to limit effective <br /> <br />Love & Associates, Inc. <br /> <br />Page 9 <br />