907.1Description.
This work consists of water control practices.
907.2Materials.
A.Stone Check Dam
1.Stabilization Section 908 2.Riprap Section 1006
3.Geotextile Section 1060
B.Temporary Slope Drain
1.Stabilization Section 908 2.Riprap Section 1006
3.Pipe Culvert Section 1031
4.Wood Section 1041
C.Compost Filter Log
1.In accordance with the DNREC’s Delaware Erosion and Sediment Control Handbook.
(https://dnrec.alpha.delaware.gov/watershed-stewardship/sediment-stormwater/)
a.Filter Sock - 5-millimeter biodegradable HDPE material.
2.Hardwood Stakes: 2-inches x 2-inches x 3-feet long
907.3Construction.
A.Inspect weekly and immediately after every rainfall to maintain and make repairs as needed.
B.Check Dam
1.Stone Check Dam
a.Construction
Construct the stone check dam perpendicular to the flow in sections of the swale or channel. Place riprap to completely cover the channel width. Construct the top of the stone check dam with the center lower than the outer edges in accordance with the Standard Construction Details.
b.Maintenance
i.Repair damage from washouts, construction traffic, or silt accumulation among the riprap or
whenever the stone check dam ceases to function as intended. ii. Remove sediment from behind the check dams when it has accumulated to 50 percent of the original height of the stone check dam at the spillway.
c.Removal
i.Remove temporary stone check dams only when directed by the engineer.
ii. Remove all riprap. iii. Stabilize disturbed areas in accordance with Section 908 immediately after removing the check dams.
2.Compost Filter Log Check Dam
a.Construction
Construct the compost filter log check dam perpendicular to the flow in sections of the swale or channel. Place the compost filter log to completely cover the width of the channel. Place the ends of the compost filter log along the banks of the swale or channel with the center lower than the outer edges as shown on Standard Construction Detail.
b.Maintenance
i.Repair damage from washouts, construction traffic, or silt accumulation among the logs or
whenever the compost filter log ceases to function as intended. ii. Remove sediment from behind the check dams when it has accumulated to 50 percent of the original height of the check dam at the spillway.
c.Removal
i.Remove temporary check dams only when directed by the engineer.
ii. Stabilize disturbed areas, in accordance with Section 908, immediately after removing the check dams.
C.Temporary Slope Drain
1.Construction
a.Install, grade, shape, and prepare embankment slopes, edge berms, and interceptor berms in
accordance with the contract and the Standard Construction Details.
b.Install a 15-inch pipe for a maximum drainage area of 1-acre.
c.Construct flexible pipe drains in accordance with Section 601. Provide flexible slope drains with potential for length changes to adjust to the interim elevations. Fasten slope drains to the slope. Construct and install a plywood anti-seep collar as shown in the Standard Construction Details. Ensure that the temporary slope drain discharges into the back of sediment traps, into sediment basins, or into ditches discharging into sediment traps or basins. When a temporary slope drain empties into a sediment trap or basin, ensure that it discharges at the riser crest or weir elevation.
d.Construct riprap aprons in accordance with Section 707. Place the apron below the pipe outlet. Provide a riprap apron in accordance with the Standard Construction Details.
e.Adjust the elevations of and reconstruct the slope drains so that the slope drains remain
functional as the embankment elevation rises.
2.Maintenance
a.Maintain embankment slopes, edge berms, and interceptor berms in accordance with Section
202.
b.Inspect the drain system for clogging or breaks. Clean and repair.
3.Removal
a.Remove the temporary slope drain when the contributing drainage area is stabilized at a
density of 70 percent as determined by the engineer. Stabilize areas disturbed by drain construction in accordance with Section 908 immediately after removal.
D.Compost Filter Log
1.Construction
a.Submit product technical data for preassembled logs for approval before use.
b.Assemble compost filter logs by tying a knot in 1 end of the filter sock, filling the sock with the
composted materials, and knotting the other end when at the desired length. Fill the filter sock leaving no gaps in compost. Keep large materials that would impede flow or create gaps out of the sock.
c.Angle the compost filter log upslope to prevent runoff from washing around the ends. Ensure
that the log ends are at least 1-foot higher than the middle. Place hardwood stakes at a maximum of 4-feet on center through the middle of the compost filter log. Use hardwood stakes with the minimum dimensions of 2-inches by 2-inches and 3-feet long. Set the stakes a minimum of 12-inches below grade.
2.Maintenance
a.Replace torn, damaged, or flattened logs throughout the life of the contract.
b.Remove accumulated sediment when the sediment reaches 50 percent of the height of the
compost filter log.
3.Removal
a.Remove the compost filter log and stakes when the engineer determines it is no longer
required.
b.Stabilize disturbed areas in accordance with Section 908. 907.4Method of Measurement.
A.The Department will measure the quantity of:
1.Temporary slope drain as the number of linear feet measured from end to end of pipe, installed
and accepted.
2.Stone check dam as the number of tons of riprap placed and accepted.
3.Compost filter log check dam as the number of linear feet of check dam completed and
accepted.
4.Compost filter logs as the number of linear feet placed and accepted.
907.5Basis of Payment.
A.The Department will pay the quantity of water control practices at the contract unit price for each
acceptably placed. Price and payment constitute full compensation for:
1.Providing all materials;
2.excavating, backfill, and backfilling;
3.installation;
4.temporary stabilization;
5.maintenance;
6.removal;
7.restoring the site; and
8.permanent stabilization.
B.The Department will pay the quantity of clearing and grubbing required for temporary swale
construction in accordance with Section 201.
C.The Department will not pay for replacement of riprap during the project construction period.
D.The Department will consider sediment removal as incidental to the water control practice item.
E.The Department will pay for additional pieces of slope drain the contractor added to existing
temporary slope drain in the same manner as payment for the existing temporary slope drain.
F.The Department will pay the quantity of edge berm according to Section 202. G.The Department will make no additional payment for stacked or the stacking of compost filter logs
used to meet the minimum height requirement of the contract.
ITEM DESCRIPTION UNIT 907001 TEMPORARY SLOPE DRAIN, 15” LF 907011 STONE CHECK DAM TONS 907012 COMPOST FILTER LOG CHECK DAM LF 907017 COMPOST FILTER LOGS LF
Referenced in this section
Sections that cite this one
Delaware revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 602–0 of 786.
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