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HomeMy WebLinkAboutFDP201700006 Study Maps Floodplain Development Permit 2017-05-04SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        FLOODPLA I N S T U D Y F O R P O W E L L S C R E E K I N T H E WE S T G L E N S U B D I V I S I O N TMP 55C-03-A, 56 A 1 - 0 1 - 2 5 , 5 6 A 1 - 0 1 - 2 6 A , 5 5 C - 0 3 - A 1 , A N D 5 6 - 1 1 5 WHITE HALL D I S T R I C T , A L B E M A R L E C O U N T Y , V I R G I N I A VICINITY MAP SCALE: 1" = 1000' S H E E T I N D E X F S 1 F S 2 F S 3 F S 4 F S 5 F S 6 F S 7 F S 8 F S 9 C O V E R S H E E T E F F E C T I V E F L O O D P L A I N O V E R V I E W R E V I S E D F L O O D P L A I N O V E R V I E W F L O O D P L A I N R E V I S E D M O D E L F L O O D P L A I N R E V I S E D M O D E L F L O O D P L A I N R E V I S E D M O D E L R O A D P R O F I L E - G O S H A W K L A N E S T A 1 0 + 0 0 T O 1 8 + 0 0 R O A D P R O F I L E - G O S H A W K L A N E S T A 1 8 + 0 0 T O 2 5 + 0 0 F L O O D P L A I N S U M M A R Y T A B L E S P A R C E L M A P S C A L E : 1 " = 2 5 0 ' Crozet Development Solutions, LLC682 BERKMAR CIRCLECharlottesville, VA 22901 OWNER/DEVELOPEROWNER:Southern Develo p m e n t G r o u p 170 South Panto p s D r . Charlottesville, V A 2 2 9 1 1 DEVELOPER: P E A C H T H R E E D R O R C H A R D D R J E R M A N S G A P R O A D C L I N G L A N E R A I L R O A D P R O P C O N N E C T O R R D P O W E L L S C R E E K C L P O W E L L S C R E E K C L The applicant has received approval of SP 2016-00003 from Albemarle County to i n s t a l l a s t r e a m c r o s s i n g i n P o w e l l ' s C r e e k f o r t h e p u r p o s e o f a ƌŽĂĚĐŽŶŶĞĐƚŝŽŶƚŽKƌĐŚĂƌĚƌŝǀĞ͘dŚĞĂƉƉůŝĐĂŶƚŚĂƐĐŽŵƉůĞƚĞĚĂĚĞƚĂŝůĞĚ,ͲZ ^  ŵ Ž Ě Ğ ů  Ž Ĩ  W Ž ǁ Ğ ů ů Ζ Ɛ   ƌ Ğ Ğ Ŭ  ŝ Ŷ  ď Ğ ƚ ǁ Ğ Ğ Ŷ   ƌ Ž Ɛ Ɛ  ^ Ğ Đ ƚ ŝ Ž Ŷ Ɛ  &  Ă Ŷ Ě D͘dŚĞĂĨĨĞĐƚĞĚĂƌĞĂŝƐƐŚŽǁŶŽŶĂŶĂŶŶŽƚĂƚĞĚ&/ZDĞƚƚĞƚĂŬĞŶĨƌŽŵ&DDĂƉϱ ϭ Ϭ Ϭ ϯ   W Ă Ŷ Ğ ů  Ϭ Ϯ Ϯ ϵ  ͕  Ğ Ĩ Ĩ Ğ Đ ƚ ŝ ǀ Ğ  Ě Ă ƚ Ğ  Ϯ ͬ ϰ ͬ Ϭ ϱ ͘   d Ś Ğ  Ɛ ƚ Ƶ Ě LJ  Ś Ă Ɛ been prepared using NAVD 1988 datum.It was determined during initial HEC-RAS modeling that the existing GIS topograph y w a s n o t a c c u r a t e , s o a d e t a i l e d t o p o g r a p h i c m a p p i n g w a s ĐŽŵƉůĞƚĞĚďLJƚŚŝƐĨŝƌŵŝŶDĂƌĐŚϮϬϭϳ͘/ƚǁĂƐĂůƐŽĂƉƉĂƌĞŶƚƚŚĂƚƚŚĞĐƵƌƌĞŶƚ&D  Ĩ ů Ž Ž Ě ů ŝ Ŷ Ğ Ɛ  Ě ŝ Ě  Ŷ Ž ƚ  ŵ Ă ƚ Đ Ś  Ĩ ŝ Ğ ů Ě Ͳ ƌ Ƶ Ŷ  ƚ Ž Ɖ Ž Ő ƌ Ă Ɖ Ś LJ ͕  Ɛ Ž  ƚ Ś Ğ Powell's Creek study was updated between cross-sections F and M (adequate over l a p ) t o c r e a t e a n e f f e c t i v e m o d e l t h a t u s e d t h e &DͲĂƉƉƌŽǀĞĚ,LJĚƌŽůŽŐŝĐDŽĚĞůĨŽƌƉĞĂŬĨůŽǁƐĂŶĚĐƌŽƐƐͲƐĞĐƚŝŽŶůŽĐĂƚŝŽŶƐ͕ďƵƚ Ƶ Ɖ Ě Ă ƚ Ğ Ě  ƚ Ž Ɖ Ž Ő ƌ Ă Ɖ Ś ŝ Đ Ă ů  ŝ Ŷ Ĩ Ž ƌ ŵ Ă ƚ ŝ Ž Ŷ ͘  ƐƉĂƌƚŽĨƚŚĞĂƉƉƌŽǀĂůŽĨ^WϮϬϭϲͲϬϬϬϬϯ͕ƚŚĞƌĞŵƵƐƚďĞĂnjĞƌŽͲƌŝƐĞŝŶƚŚĞϭϬϬͲLJĞĂ ƌ  Ĩ ů Ž Ž Ě Ɖ ů Ă ŝ Ŷ  Ğ ů Ğ ǀ Ă ƚ ŝ Ž Ŷ Ɛ  Ž Ŷ  Ă Ě ũ Ž ŝ Ŷ ŝ Ŷ Ő  Ɖ ƌ Ž Ɖ Ğ ƌ ƚ ŝ Ğ Ɛ ͘   d Ś Ğ  Ă ƚ ƚ Ă Đ Ś Ğ Ě ĨůŽŽĚƐƚƵĚLJŝŶĚŝĐĂƚĞƐĂnjĞƌŽͲƌŝƐĞŽŶĂĚũĂĐĞŶƚƉƌŽƉĞƌƚŝĞƐĂƐƐŚŽǁŶŽŶƚŚĞƉůĂŶĂŶĚ Ž Ŷ  ƚ Ś Ğ  Ɖ ƌ Ž Ĩ ŝ ů Ğ  Ɛ Ƶ ŵ ŵ Ă ƌ LJ  ƚ Ă ď ů Ğ  Ž Ŷ  ^ Ś Ğ Ğ ƚ  & ^ ϵ ͘   W ů Ğ Ă Ɛ Ğ  Ŷ Ž ƚ Ğ  ƚ Ś Ă ƚ there is an approximate 2.5-foot maximum rise at Cross Section I (RS=1979.91) on t h e u p s t r e a m s i d e o f t h e d o u b l e 8 ' x 8 ' b o x c u l v e r t , a n d t h e &ƌĞƚƵƌŶƐƚŽĂnjĞƌŽƌŝƐĞĂƉƉƌŽdžŝŵĂƚĞůLJϱϴϬΖƵƉƐƚƌĞĂŵĂƚ^ĞĐƚŝŽŶ:;Z^сϮϱϱϵ͘ϴϲͿ͘WůĞĂƐĞĂůƐŽŶŽƚĞƚŚĂƚƚŚĞƌĞŝƐƉƌŽƉŽƐĞĚƌŽĂĚĨŝůůĂƐƐŚŽǁŶŽŶƚŚĞ^WƚŚĂƚŽĐĐƵƌƐŝŶ ď Ğ ƚ ǁ Ğ Ğ Ŷ  Đ ƌ Ž Ɛ Ɛ Ͳ Ɛ Ğ Đ ƚ ŝ Ž Ŷ Ɛ  '  Ă Ŷ Ě  , ͘   d Ś Ğ  ƌ Ž Ă Ě  Ĩ ŝ ů ů  Ž Đ Đ Ƶ ƌ Ɛ  ŝ Ŷ  ƚ Ś Ğ ĨůŽŽĚƉůĂŝŶĨƌŝŶŐĞŽŶůLJĂŶĚƌĞƐƵůƚƐŝŶĂnjĞƌŽͲƌŝƐĞŝŶ&͘/ŶĐŝĚĞŶƚĂůĞdžƉĂŶƐŝŽŶŽĨƚŚĞ Ĩ ů Ž Ž Ě ǁ Ă LJ  ů ŝ ŵ ŝ ƚ Ɛ  Ž Đ Đ Ƶ ƌ  Ě Ƶ Ğ  ƚ Ž  ƚ Ś Ğ  Ĩ ŝ ů ů  Ž Ŷ  ƚ Ś Ğ  Ĩ ƌ ŝ Ŷ Ő Ğ Ɛ  ƚ Ś Ă ƚ  Ě Ž ŶŽƚŚĂǀĞĂŶŝŵƉĂĐƚŽŶƚŚĞ&͘&ŽƌŵŽƌĞĚĞƚĂŝůŽŶƚŚĞnjĞƌŽƌŝƐĞŽŶŽĨĨƐŝƚĞƉƌŽƉĞƌƚ ŝ Ğ Ɛ ͕  ƌ Ğ Ĩ Ğ ƌ  ƚ Ž  ^ Ś Ğ Ğ ƚ  & ^ ϵ  Ž Ĩ  ƚ Ś Ğ  Ĩ ů Ž Ž Ě  Ɛ ƚ Ƶ Ě LJ ͕  Ž ƌ  ƚ Ś Ğ  ,   Ͳ Z  ^ ŵŽĚĞů͘In order to permit the stream crossing, the applicant is submitting a floodplain dev e l o p m e n t p e r m i t r e q u e s t a n d a C L O M R r e q u e s t t o F E M A t o ŝŶĚŝĐĂƚĞĞůĞǀĂƚŝŽŶĐŚĂŶŐĞƐƚŽƚŚĞ&ŝŶƚŚĞĂƌĞĂŽĨƚŚĞƐƚƌĞĂŵĐƌŽƐƐŝŶŐ͘dŚĞĂƉƉůŝ Đ Ă Ŷ ƚ  ŝ Ɛ  Ă ů Ɛ Ž  Ă Ɖ Ɖ ů LJ ŝ Ŷ Ő  Ĩ Ž ƌ  Ă  h ^   K   Ɖ Ğ ƌ ŵ ŝ ƚ  Ĩ Ž ƌ  ƚ Ś Ğ  ǁ Ž ƌ Ŭ  ŝ Ŷ ƚŚĞƐƚƌĞĂŵƵŶĚĞƌƐĞƉĂƌĂƚĞĐŽǀĞƌ͘&DƌĞƋƵŝƌĞƐƚŚĞ>ŽĐĂů&ůŽŽĚƉůĂŝŶĚŵŝŶŝƐƚƌĂƚ Ž ƌ  ƚ Ž  Ɛ ŝ Ő Ŷ  Ă Ŷ  ͞ K ǀ Ğ ƌ ǀ ŝ Ğ ǁ  Ă Ŷ Ě   Ž Ŷ Đ Ƶ ƌ ƌ Ğ Ŷ Đ Ğ ͟  & Ž ƌ ŵ  Ɖ ƌ ŝ Ž ƌ  ƚ Ž  ƚ Ś Ğ >KDZƐƵďŵŝƐƐŝŽŶ͘FLOODPLAIN NARRATIVE 1 0 0 - Y R F E M A F L O O D P L A I N 1 0 0 - Y R F E M A F L O O D P L A I N SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q        SHEET TITLE: D O M . P R O J E C T N O : I N D E X T I T L E : D A T E : S H E E T N O : s u r v e y o r s e n g i n e e r s p l a n n ers d e s i g n ers 172 South Pantops Drive Charlottesville, VA 22911 434.979.8121 (p) 434.979.1681 (f) dominioneng.com / + % * # ' .  (   / ; ' 4 5 . K E   0 Q