3. EXTERNAL CHANNEL k e e r C y a 0 9 w y e s w t a - PowerPoint PPT Presentation

3. EXTERNAL CHANNEL k e e r C y a 0 9 w y e s w t a H i G S l U E l Robinson's Y A Landing W D R W a l A W E M O H i l l G r d h a n S k High e a Blakely Meadows r k n s Bend e d e S c r E LL I P S C C R H o EE Lake h a K o r Autumn Pointe m k m o l w e Ridge a w a OUT a h Stone y e w N r T g TRACT e d r Creek r i t n o r n i y T E R R I T O R Y Laurel B L V D . n Crest C u Preston L VD . B Forest e k r e C l i s W a E l y Sartartia River Crescent YOU ARE HERE Glen Sports Complex M.S. Ridge West Y A W D H O E W A R Lakewind M Meadow R i Greyston v e r s Place o Watermill z a B r Brandon's Cambridge Cambridge Cambridge Pointe Park Park Park New Territory New Territory WHERE N LEVEE V E R I 400 200 100 0 200 R SCALE: 1"=200' O S BR A Z

DOWNSTREAM SHEET PILE STRUCTURE 3. EXTERNAL CHANNEL WHY: LEGEND EXISTING CHANNEL CENTERLINE Erosion of the channel may cause PROPOSED CHANNEL CENTERLINE damage to the adjacent levee PROPOSED CHANNEL INNER BERM CONSTRUCTED BOULDER RIFFLE PROPOSED CHANNEL BANKFULL GEOMORPHIC FLOODPLAIN N 100-YR FLOODPLAIN J-HOOK LIMITS OF DISTURBANCE EXISTING CONTOURS MAJOR EXISTING CONTOURS MINOR WOOD TOE PROPOSED CONTOURS MAJOR 200 100 50 0 100 SCALE: 1"=100' PROPOSED CONTOURS MINOR EXISTING GABION EXISTING GABION LEVEE DROP STRUCTURE DROP STRUCTURE EXISTING SHEET PILE DROP STRUCTURE 0 0 3 + 4 + 0 0 5 + 0 0 V E R 0 + 0 2 6 + 0 0 R I 0 0 + 1 7 + 0 0 O S 0 + 0 0 8 + 0 0 9 + 0 0 BR A Z 1 0 + 0 0 1 1 + 0 0 1 2 + 0 0 1 3 + 0 0 1 4 + 0 0 1 5 + 0 0 1 6 + 0 0 6 8 7 + 1 0 7 + 0 1 EXISTING SHEET PILE DROP EXISTING GABION STRUCTURE DROP STRUCTURE EXISTING GABION DROP STRUCTURE

HOW: 3. EXTERNAL CHANNEL Use "nested" natural channel design inside of large flood control channel to reduce velocities and eliminate erosive forces CONSTRUCTED ROCK J-HOOK CONSTRUCTED BOULDER RIFFLE