Laserfiche WebLink
Little Crook NEC -RAS Model Review <br />Thera Is a berm on the MR bank of the downstream end of <br />LEtia Creek that Is rat adaquMnly madded with the cry <br />sections In the NEC -RAS model. This area would be better <br />repreaanbed with shoFlar and more frequsrd cruse ascdons <br />alltRted as shown by the red lines to dstsrmine INwhme qts <br />berm Is ovalopped. If the berm Is ovsrteppsd, the ores <br />north and wast of the berth (outlined by the preen one) <br />should be modeled with a atorape area or ZD ansa to <br />determine the exlent of inundation. Ahw, the downebeam <br />boundary condition In the HEC-RAB model is defined as <br />a constant warm aurfaes ekr+mgon for all Sows modeled <br />(2 -year through Myearl. This la unfiksly to be the ease. <br />If this watts In be high, water surface elevations will be oYer- <br />asllmeted, and Rads value Is loo low, water surfaoa <br />elevations will be undersetlrruled. <br />Crossings (msrkad with orange stare <br />are not modeled. Because of this, <br />the MmdpWM delineations upstream <br />and downstream of these crnuings <br />are misrepmsenbd (true for an <br />locatlanswhara crossings ars not <br />modOI64 <br />The fkwdplain k undersstimsted. <br />Crass sections are bent so sharply <br />upstream that they cim arOcial <br />high ground boundaries on the rlgM <br />bank and prevent water $pre <br />spreading out Into this arae. 9 is <br />recommended that arose a cftne <br />be allpned as shown by the red lines. <br />Review al Zona A <br />App u dmateSI&W <br />Areas Mapped By <br />BTARR <br />IJltle Creak <br />afro cam, VA <br />L��- <br />a Imp ZRO <br />Lia ru <br />r+.vuar <br />MUMMER <br />