SWA000149_Plansheet (02) - Proposed Conditions_Site Plan_20220713

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FILTER FABRIC I III IIII IIII IIII — � W L� ro m m a a ?'7 12" MAX ® CENTER v O .-
SPACE CHECK DAMS IN A CHANNEL SO THAT THE CREST OF
DOWNSTREAM DAM IS AT ELEVATION OF THE TOE OF UPSTREAM DAM.
SECTION A -A
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PROPOSED / EXISTING GRADE EXISTING GRADE ♦i �0
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CONSTRUCTION & MAINTENANCE NOTES: q
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1. PLACE STONE TO THE LINES AND DIMENSIONS SHOWN IN THE PLAN ON A FILTER FABRIC FOUNDATION.
2. KEEP THE CENTER STONE SECTION AT LEAST 9 INCHES BELOW NATURAL GROUND LEVEL WHERE THE DAM ABUTS THE CHANNEL BANKS.
3. EXTEND STONE AT LEAST 1.5 FEET BEYOND THE DITCH BANK TO KEEP WATER FROM CUTTING AROUND THE ENDS OF THE CHECK DAM.
4. SET SPACING BETWEEN DAMS TO ASSURE THAT THE ELEVATION AT THE TOP OF THE LOWER DAM IS THE SAME AS THE TOE ELEVATION OF THE UPPER DAM.
5. PROTECT THE CHANNEL AFTER THE LOWEST CHECK DAM FROM HEAVY FLOW THAT COULD CAUSE EROSION.
6. MAKE SURE THAT THE CHANNEL REACH ABOVE THE MOST UPSTREAM DAM IS STABLE.
7. ENSURE THAT OTHER AREAS OF THE CHANNEL, SUCH AS CULVERT ENTRANCES BELOW THE CHECK DAMS, ARE NOT SUBJECT TO DAMAGE OR BLOCKAGE FROM
DISPLACED STONES.
MAINTENANCE:
INSPECT CHECK DAMS AND CHANNELS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (i INCH OR GREATER) RAINFALL EVEN AND REPAIR IMMEDIATELY. CLEAN OUT
SEDIMENT, STRAW, LIMBS, OR OTHER DEBRIS THAT COULD CLOG THE CHANNEL WHEN NEEDED. cn
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ANTICIPATE SUBMERGENCE AND DEPOSITION ABOVE THE CHECK DAM AND EROSION FROM HIGH FLOWS AROUND THE EDGES OF THE DAM. CORRECT ALL DAMAGE o
IMMEDIATELY. IF SIGNIFICANT EROSION OCCURS BETWEEN DAMS, ADDITIONAL MEASURES CAN BE TAKEN SUCH AS, INSTALLING A PROTECTIVE RIP -RAP LINER IN THAT w
PORTION OF THE CHANNEL. ch
REMOVE SEDIMENT ACCUMULATION BEHIND THE DAMS AS NEEDED TO PREVENT DAMAGE TO CHANNEL VEGETATION, ALLOW THE CHANNEL TO DRAIN THROUGH THE STONE
CHECK DAM, AND PREVENT LARGE FLOWS FROM CARRYING SEDIMENT OVER THE DAM. ADD STONES TO DAMS AS NEEDED TO MAINTAIN DESIGN HEIGHT AND CROSS
SECTION.
CHECK DAM DETAIL
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TYPICAL ROAD SECTION A —A
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SHEET NO.0
�F 02 SHEETS
PROJECT N0.
P22051
DESIGNED BY
TMG
DRAWN BY
/-�
CSC
CHECKED BY
rMG
ISSUE DATE
060922