WATER CONTROL PRACTICES SECTION 907 590 SECTION 907 — WATER CONTROL PRACTICES
907.1Description.
This work consists of water control practices.
907.2Materials.
(https://dnrec.alpha.delaware.gov/watershed -stewardship/sediment -stormwater/ )
907.3Construction.
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.
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.
ii. Remove all riprap. WATER CONTROL PRACTICES SECTION 907 591 iii. Stabilize disturbed areas in accordance with Section 908 immediately after removing the check dams.
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 ch annel with the center lower than the outer edges as shown on Standard Construction Detail.
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.
ii. Stabilize disturbed areas, in accordance with Section 908, immediately after removing the check dams.
accordance with the contract and the Standard Construction Details.
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 sho wn 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.
outlet. Provide a riprap apron in accordance with the Standard Construction Details.
functional as the embankment elevation rises.
202.
WATER CONTROL PRACTICES SECTION 907 592 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.
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.
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.
compost filter log.
907.4Method of Measurement.
and accepted.
907.5Basis of Payment.
acceptably placed. Price and payment constitute full compensation for:
WATER CONTROL PRACTICES SECTION 907 593 6. removal;
construction in accordance with Section 201.
temporary slope drain in the same manner as payment for the existing temporary slope drain.
ITEM DESCRIPTION UNIT 907001 TEMPORARY SLOPE DRAIN, 15” LF 907011 STONE CHECK DAM TONS 907017 COMPOST FILTER LOGS LF
SOIL STABILIZATION PRACTICES SECTION 908 594 SECTION 908 — SOIL STABILIZATION PRACTICES
908.1Description.
This work consists of soil stabilization practices using perennial grasses, topsoil, topsoiling, and mulching.
908.2Materials.
inches in diameter and materials harmful to plant growth.
(Sicyos angulatus) , Giant Ragweed (Ambrosia trifida) , and Texas Amaranth (Amaranthus palmeri) .
needed to establish permanent vegetation.
temporarily stockpiling for later use in accordance with Section 202.
(Sicyos angulatus) , Giant Ragweed (Ambrosia trifida) , and Texas Amaranth (Amaranthus palmeri) .
needed to establish permanent vegetation.
ii. For project mixed seed of special seed formulas or mixtures not specified in Tables 908.2 -1 through 908.2 -3 and Table 908.2 -5, use seed previously inspected, tested, and approved by the Delaware Department of Agriculture for the designated purity, germination, weed seed limits, and pure live seed analysis. iii. Provide seed void of Johnsongrass (Sorghum halepense) , Canada Thistle (Cirsium arvense) , Burcucumber (Sicyos angulatus) , Giant Ragweed (Ambrosia trifida) , and Texas Amaranth (Amaranthus palmeri) .
ii. Table 908.2 -2 - Grass Seeding - Stormwater Facility (GS -SF)