Item 505

A class of stone intended for riprap ranging from a minimum of 15 kg to a maximum of 25 kg., with at least 50 percent of the stones weighing more than 20 kg.

Class A

Class B

Class C

Class D

A class of stone intended for riprap ranging from a minimum of 60 kg to a maximum of 100 kg with at least 50 percent of the stones weighing more than 80 kg.

Class A

Class B

Class C

Class D

It shall be placed horizontally at the lowest points where free outlets for water can be obtained and shall be spaced at not more than 2 m center to center in a staggered manner.

Weepholes

Filter Cloth

Drain Pipe

Drainage Canal

Minimum thickness of Riprap Class D

300 mm

500 mm

600 mm

800 mm

Minimum diameter of PVC weepholes

25 mm

50 mm

75 mm

100 mm

Minimum thickness of Riprap Class B

300 mm

500 mm

800 mm

900 mm

Minimum density of recycled broken concrete that can be used as an alternative for stones in the construction of riprap

2425 kg/m3

2254 kg/m3

2245 kg/m3

2542 kg/m3

The minimum length of the weepholes shall be greater than or equal to

length of the riprap

height of the riprap

depending on the type of pipe

thickness of the riprap

Item of Work for Riprap and Grouted Riprap under Volume II and Volume III

505, 1710

506, 1710

505, 1711

506, 1711

Unit of Measurement for the Basis of Payment of Item 505 – Riprap and Grouted Riprap

Square meter

Lump sum

Linear meter

Cubic meter

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