8. Drainage and Slope Protection

In Item 502 – Manholes, Inlets And Catch Basins, joints mortar shall be composed of one part Portland Cement and _____ fine aggregate by volume

two parts

Item 520 – Hydroseeding, the entire hydroseeded area shall be grown-in and maintained for _____ calendar days from date of the hydroseeding completion

60 to 90

Item 507 – Rubble Concrete, clearance between stones shall not be less than ____ the maximum size of concrete aggregate for Class “B”.

63 m

Item 503 – Drainage Steel Grating w/ Frame, _____ shall be used to collect surface rainwater run off from areas that cannot be graded to direct flow into a single pit.

Trench grates

Item 503 – Drainage Steel Grating w/ Frame, _____ shall be used to transfer road surface storm water into an underground drainage system. Normally used in conjunction with kerb entry, the addition of the grate significantly increases the hydraulic capacity of the inlet, particularly on steep slopes

Box Grates

Item 506 – Stone Masonry, mortar that is not used within ___ minutes after the water has been added shall be discarded.

90

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, class B, minimum thickness shall be _____

100 mm

Item 503 – Drainage Steel Grating w/ Frame, strength classifications of grates for locations subject to vehicles such as large forklifts, earthmoving or container handling equipment and aircraft. Typical locations include wharves, container storage areas, heavy industry or construction sites and domestic or international airports

Class E

Item 513 – Permanent Ground Anchors, Grout shall be capable of reaching a cube strength of ____ MPa in 7 days

25

Item 507 – Rubble Concrete, stones to be used shall be more than ___ cubic meter in volume

0.015

Item 505 – Riprap and Grouted Riprap, Class A – Stones ranging from a minimum of ____ kg to a maximum of ____ kg

15, 25

Item 511 – Gabions and Mattresses, heights shall be _____ or as shown on the plans.

0.50 m to 1.00 m

Item 503 – Drainage Steel Grating w/ Frame, to prevent the grating from falling over and to provide restraint in buckling, a twisted cross rod ____ is forge-welded into the top of the flat bars.

6mm

Item 515 – Wet Stone Masonry (Cobble Stone), unless otherwise specified the weepholes shall be placed at the lowest points where the outlets of water can be obtained and shall be spaced not more than ____ meters center to center

3

In Item 502 – Manholes, Inlets And Catch Basins, pre-cast Concrete units shall be cast in substantial permanent steel forms. Structural concrete used shall attain a minimum 28-day compressive strength of ____ MPa

20.682

Item 505 – Riprap and Grouted Riprap, the length of the weepholes shall not be less than the thickness of the walls of the abutment and shall be at least ____ mm diameter PVC or other pipe materials

50

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, materials for backfilling on each side of the conduit shall not contain stones that would be retained on a ____ sieve, chunks of highly plastic clay, or other objectionable material.

50 mm

For shotcrete, the minimum cement content is _____ kg/m^3

325

Item 503 – Drainage Steel Grating w/ Frame, the flat bar thickness shall consist of _______ dimension/s

All of the above

Item 510 – Concrete Slope Protection, unless otherwise specified, the concrete slabs shall not be greater than ______

4m by 4m

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, class B, bedding shall consist of bedding the conduit to a depth of not less than ____ percent of its total height.

30

Item 515 – Wet Stone Masonry (Cobble Stone), Cobble Stone, 100~150 mm shall be of the weight ranging from

15 kg to 20 kg

Item 515 – Wet Stone Masonry (Cobble Stone), Cobble Stone, 150~300 mm shall be of the weight ranging from

20 kg to 40 kg 

Item 505 – Riprap and Grouted Riprap, weepholes shall be placed horizontally at the lowest points where free outlets for water can be obtained and shall be spaced at not more than ___ m center to center in a staggered manner

2

Item 511 – Gabions and Mattresses, rock pieces shall be generally uniformly graded in sizes ranging from ___

100 mm to 200 mm

In Item 501 – Underdrains, a minimum of ____ bedding layer of granular backfill material shall be placed and compacted at the bottom of the trench for its full width and length.

150 mm

Item 505 – Riprap and Grouted Riprap, mortar for grouted riprap mixed in the proportion of one part cement to ___ parts sand by volume, and sufficient water to obtain the required consistency

3

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, the conduit laying shall begin at the ________ end of the conduit line

downstream

Item 503 – Drainage Steel Grating w/ Frame, the flat bar width shall consist of _______ dimension

25mm to 65m

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, when no bedding class is specified, the requirements for ______ bedding shall apply.

Class C

Item 506 – Stone Masonry, stones shall have a thickness of not less than ____

150 mm

Item 503 – Drainage Steel Grating w/ Frame, _____ shall be used to create a trafficable ground level entry area for surface rainwater to flow into the underground stormwater drainage system. It shall be used in paved or grassed areas that are graded to direct the surface water to a single pit or to a series of pits

Sump grates

Item 503 – Drainage Steel Grating w/ Frame, strength classifications of grates for locations normally trafficked by pedestrians and slow moving passenger cars or light agricultural tractors. These locations include areas accessible to infrequent slow moving heavy trucks. Typical locations include footpaths, ground level and multistoried car parks, suburban driveways and back yards.

Class B

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, elliptical and elliptically reinforced conduits shall be placed with the major axis within ______ of a vertical plane through the longitudinal axis of the conduit.

5 degrees

Item 515 – MSE Retaining Walls, concrete facing panels shall have a minimum thickness of

140 mm

Item 514 – Shotcrete (Concrete Spray), when continuous mixing is used, take sample from approximately every ____ m^3

7.5

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, bell or groove ends of rigid conduits and outside circumferential laps of flexible conduits shall be placed facing _____.

upstream

Item 503 – Drainage Steel Grating w/ Frame, the flat bar shall have a spacing of ____ O.C.

30mm

Item 503 – Drainage Steel Grating w/ Frame, the flat bar shall braced with twisted rod spaced at ____ O.C.

100 mm

Item 506 – Stone Masonry, where copings are not called for, the top of the wall shall be finished with stones wide enough to cover the top of the wall from 450 mm to 1000 mm in length, and of random heights, with a minimum height of _____

150 mm

Item 515 – MSE Retaining Walls, Concrete Face panels shall have a minimum compressive strength of __ MPa at 28 days

30

Item 505 – Riprap and Grouted Riprap, Class C shall have a minimum thickness of ____

600 mm

Item 503 – Drainage Steel Grating w/ Frame, strength classifications of grates for locations trafficked by fast moving fully laden trucks and forklifts with wheel loads to 5.0T. This includes all public roads from residential to freeway.

Class D

Item 514 – Shotcrete (Concrete Spray), sample shall be taken from every batch of shotcrete mixture after at least ____ m^3 are discharge and before placing any of the batches.

0.20

Item 511 – Gabions and Mattresses, Filled gabions shall have a minimum density of ______ kg/m^3

1400

Item 503 – Drainage Steel Grating w/ Frame, strength classifications of grates for locations trafficked by slow moving fully laden trucks such as pedestrians, malls and industrial or commercial areas

Class C

Item 505 – Riprap and Grouted Riprap, Class C – Stones ranging from a minimum of ____ kg to a maximum of ____ kg

60, 100

Item 505 – Riprap and Grouted Riprap, Class B – Stones ranging from a minimum of ____ kg to a maximum of ____ kg

30, 70

In Item 500 – Pipe Culverts, Storm Drains and Lined Canal, for flexible pipe, the bed shall be roughly shaped and a bedding blanket of sand or fine granular material with thickness ____ for pipe corrugation depth of 25 mm.

50 mm

Item 503 – Drainage Steel Grating w/ Frame, strength classifications of grates for locations trafficked only by pedestrians, wheelchairs and cyclists – inaccessible to motor vehicles by virtue of barriers, narrow passages or stepped or unpaved approaches.

Class A

Item 505 – Riprap and Grouted Riprap, grout shall be placed from bottom to top of the surface swept with a stiff broom. After grouting is completed, the surface shall be cured for a period of at least ____ days

3

Item 503 – Drainage Steel Grating w/ Frame, the steel frame clear openings of drainage grates shall be ____ larger than nominal sizes of industry standard sized pit

15mm

Item 505 – Riprap and Grouted Riprap, the horizontal and vertical contact surface between stones shall be embedded by cement mortar having a minimum thickness of ____

20 mm

Item 514 – Shotcrete (Concrete Spray), For Coring, ___ 75-millimeter diameter cores shall be taken from each test panel

Six

Item 503 – Drainage Steel Grating w/ Frame, the flat bar shall have a length of not more than ____

6.1 m

Stones for riprap shall consist of rock as nearly as rectangular in section as is practical, except that riprap of _____ may consist of round natural stones

Class A

Item 511 – Gabions and Mattresses, the lengths shall be ____ times the width

All of the above

Item 505 – Riprap and Grouted Riprap, Class A shall have a minimum thickness of ____

300 mm

In Item 502 – Manholes, Inlets And Catch Basins, Cracks in units, honeycombed or patched areas in excess of _______ square millimeters, excessive water absorption and failure to meet strength requirements shall be the causes for rejection.

2,000

Item 505 – Riprap and Grouted Riprap, the grading of the filter material shall be as specified on the Plans, or in the Special Provisions. If not so specified, it will be required that D15 of the filter is at least __ times the size D85 for the embankment material

4