820Flume Inlets and Slope Drains

820.1 Description

Construct the designated type of flume inlets and slope drains as shown in the Contract Documents. B I D I T E M S U N I T S F l u m e I n l e t ( * ) E a c h S l o p e D r a i n ( * ) L i n e a r F o o t Slope Drain (Special) Linear Foot *Type: concrete, gr outed stone or stone

820.2 Materials

Provide materials that comply with the applicable requirements. Concrete and Grout ............................................................................................... SECTIONS 401 & 402 Aggregates for Concrete Not On Grade ................................................................ SECTION 1102 Stone for Flume Inlets and Slope Drains ............................................................... DIVISION 1100 Type 2 Liquid Membrane-Forming Compound .................................................... DIVISION 1400 Reinforcing Steel ................................................................................................... DIVISION 1600 Welded Steel Wire Fabric ..................................................................................... DIVISION 1600

820.3 Construction Requirements

a. Concrete. Construct flume inlets and slope drains as shown in the Contract Documents. Excavate to allow construction of forms and excavate to sufficient depth to obtain the designated thickness, elevation and grade. Prior to concrete placement, place reinforcement for conc rete inlets and drains as shown in the Contract Documents. Support reinforcement on bar chairs. Unless shown otherwise in the Contract Documents, construct concrete flume inlets and slope drains of Grade 3.0 (AE) concrete. Uniformly consolidate the concrete without voids. Cure and protect concrete according to

Division 700

b. Stone and Grouted Stone. Construct stone inlets and slope drains as shown in the Contract Documents. Place stones with ends and sides abutting. Use spalls to fill larger spaces be tween stones. Offset joints between stones with the joint in the row below. For grouted stone, pour and broom grout into spaces between stones until the spaces are completely filled. Immediat ely after the grout is placed, cure in the same manner as required for the concrete. c. Backfill. Place backfill material along the sides of the inle ts and slope drains to the top of the outside edges. Compact the backfill to a density of 90% of the standard compaction of the material used. On projects where Type B compaction is required on the adjacent roadway, construct the compaction for flume inlets and slope drains to the requirements for Type B compaction, SECTION 205.