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VAIL GOLF COURSE STARTER SHACK FLOODPLAIN REPORT 1983
' 1 • 1 1 � ' FLOOOPLAI�! EY ' AI G�LF COURSE 5TAR3ER HOUS� , I983 � F� 1 Prepared for ' Morter Fisher Architects 143 East Meadow Drive C rossroads at Vail tYail , Ca7orada 81657 1 ' Prepared by 1 �.. .�� � -•,:`_�,� ' HYDRO-TRIAD, LTD. 12687 �'est Cedar �ri v� Lakewood, Colorado 8022$ � 303-989-1267 ' ' , � FLOODPLAIN EYA�.UATION FOR VAIL GQLF COURSE STARTER N�USE , INTRODUCTdON , The owners af the Vail olf CQUrSE' desir�e to construct a new 9 ' starter hause. The existing house is to be removed an� the new house constructed a�proximately 70 feet west of the existing ho�se. ' The existing starter house is located withzn the Gore Creek 100- ' year floodplain. The proposed starter house will also be 1 oa d witt�in the G�re Creek 100-year floodplain. The floodplain is pre- ' sented in the Gare Creeic Floodplain Information report for Vai� , Eagle � Caunty, Colorado, I975, as published by the Colorado Water Conserva- tion Board. The floodplain is regulated hy the City of Vail following ' their regulation and the floodp3ain as reported in the Federal Fload �nsurance Rate Map CFIRM) for the town af Yai1 , effective date of May ' 2, 1983. The specific area is shown on Panel 3 of 5, 0$�QQ540003B, and ' is located in Zone A2. The F�oadpiain, as presented in the Gore Creek report, is the basis for the floodpla�n as shown on the FIRM. ' INVESTIGATIOhJ 1 The a�proximate iacatiart of the existing and proposed starter ' houses are shown an Figure 1. 7he h�uses are about 250 feet fram the � center of Gore Creek and l �e in the sauth overbank. The floodplain elevatian is 8224.7 at Section 45.2 and the ground el�vation at �he � propased sta�ter house ar,�a�i��aq ' �d 8�f�3�, Sec ion 4�.2. The depth --�---�., af fiow is 0.9 foot. According to the camp�ter ealculations for Gore 1 ��.�3. � 1 ' ' Creek, the flow is divided between the channel and the sauth 8verbank. The south overbank conveys 822 cubic feet per secor�d at an average ' velocity of 2.4 feet per second. ' The approximate aocation of the propased starter ha�se is very near Section 45.2. For purposes of this report, it is assumed they ' are the same. Section 45.Z did not go through the existi�g starter ' house. Fig�re 2 shows Section 45.2 with the �xisting house proj�cted and the proposed house projected on the section. This comparison tshows that the proposed fac�lity will block an additional 36 square feet of flow area, which is less than 11� of the total overbank �ross- ' sec�ional area, The original work aecounted for the existing ' b�ildinqs an� trees in the n-value. Using the continuity equation, the most the average vel oci�y coul d i ncrease woul d be fro�a 2.4 to 2.9 ' cfs. T�e actual average vela�ity would be l�ss than 2.9 feet per sec4nd and the velocity would be sliqhtly higher at the structure, but � would not cause an increase in erosian potential . � If the displaced cross-sectional area could be spread out over the total overbank, th� resulting increase in water surface would be less ' �han Q.1 foot. The actual backwater calculation would be much less ' than Q.1 foot. , The mapping was based upon arerial pho�ography taken vrhile snow was on the flatter overbank area. Th�s, exact ground elevations cannot be ttaken from the mappi�g. The pla� presented by Morter Fisi�er P,rchi- teets shows a ground elevation of 8225 near the proposed building. � This appears to be one foot hi�her than the mapping. Yet, mapping is � 1 ' ' accurate to pl us or �ni nus one-hal f the coRtour interval , or i n t'�i s �-°�� case, one foot. The propased fi rst�flood� el evati on is 8227.5. If one ' foot was subtracted, the first floor elevation would still be approxi- ' mate�y ane and one-haif feet above the floodplaina ' CONCLllSI�N ' From the abave investigation, it is apparent the pr4posed starter house will have a minor effect on the floodplain, and on7y within a ' small localized area. The propased house wrill n�t adv�rsely affect adjacent properties or increase the quantity of water. Only slight ' velacity changes would occ�r. These w�ould be localized and be �rosive ' orr grassed areas. � The proposed house is to be eleva�ed �n fi11 above the 100-year fl aodpl ai n. Thus, ti�ere i s no need to anchor to resi st fl oatati on or^ � other lateral mavement. Since the proposed house is above the 100-year �Flaodplain, the hause would not likely callapse during a � flood. ' ' ' ' � , ' ' ' RECOMMENDA7IONS ' Sinee the proposed hause has little effect on the 100-year floodplain, no effect on the surrounding pro�erties, and is eievated ' above the 100-year floodplain, we recorrnnend it �e al�owed to be constructed. ' ,4`��t�1r��H���r�,I r� +��1�``�b���°iF,°C*ISTERFOf'9�j�%�,Respectfully submitted, 1 � � �� , � � �YDRO-TRIAD, LTD. -'�• •�= . � : .0 2�36 �` � --� �� ..� �,. . �� � ���-�`� `',y':;s, �,��°'OQ,*' ���J� ' O E +�. � ��i��` °�'•:::.•.�¢ ��� '�•,,aF C4�Q,•�' Brian 5, Kvl stad, P.E. , j"�""'" Senior Water Resvvrce Engineer ' Attachments - Fi gure 1 - Pl an Vi ew Figure 2 - Cross-Sectians � Figure 3 - Morter Fisher Details ' i 1 1 1 1 � 1 1 t� _.. S, �, � `�7. � '� ;� � ,. 4 � f � �j `(�� �`4Q � � I ' �' d � � � � �� o � j � � p � �a J � m � � � - � �, „ p p � � , • � Q � 2 f � � : � ; � � � � � � o � � � ow � � � � � � � I � � � � �� � � � w ,� _ - � � � I �.. � .$ � � � I � � � � �� �. 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'�� � =,� Rev�sions HYDRO-TR1AD� L TD Sheet Number V,4 f L GOLF C�+URSE' STARTER H�USE SEPT. 30, 1983 �fC�URE 3