CHAPTER 11 — STORM DRAINAGE SYSTEM Quizlet

Storm drainage

_____ are required for roof areas, courts and courtyards to collect stormwater and discharge the stormwater to an approved point of disposal.

interior

Rainwater downspout or conductor pipings placed within the _____ of a building inside a vertical pipe chase or run within a vent shaft shall be of cast iron, galvanized steel, iron, brass, copper, lead, Schedule 40 ABS, DWV, Series 1000, PVC DWV or other approved materials.

exterior

Rainwater downspout or conductor located on the _____ side of a low height building shall be not less than 26 ga. (0.45 mm thickness) galvanized sheet metal.

medium

Rainwater piping located within a _____ height building basement area shall be of galvanized iron pipe, Schedule 30; cast iron soil pipe, S.W. Type DWV copper tube, Schedule 40 ABS, DWV, Series 1000, PVC DWV, or other approved materials.

high rise

Downspouts for _____ buildings shall be of stronger pipe materials to resist the high hydrostatic pressure inside the vertical downspout

0.6 meter

Rainwater piping commencing _____ from the exterior of a building may be of suitable approved materials

1) Cast iron

2) Copper

3) other Corrosion-resistant materials

Roof drain materials. Hint: 3 C's

102 mm

Roof drains shall be equipped with strainers extending not less than _____ above the surface of the roof immediately adjacent to the drain,

1.5 times the area of outlet pipe

Dome-type strainers: min. total net inlet area

2 times the area of outlet pipe

Flat surface-type strainers: min. total net inlet area

two (2) times

Flat surface roof deck strainers shall have a total net inlet area not less than _____ the area of the outlet pipe to which the drain is connected.

inside caulk or female screwed

In all cases, the roof drain outlet connections are _____

102 mm/hour

A _____ rainfall intensity is used around Manila area.

Add fifty (50) percent of area of the wall to the roof area

Roof area to be considered when sizing rainwater piping for one (1) wall.

Add thirty five (35) percent of the total wall areas to the roof area

Roof area to be considered when sizing rainwater piping for two adjacent wall.

Add no additional area to the roof area

Roof area to be considered when sizing rainwater piping for two (2) walls opposite each other and of same heights

Add fifty (50) percent of wall area above top of lower wall to the roof area

Roof area to be considered when sizing rainwater piping for two (2) walls opposite of differing heights.

one-half

The area of the side of a tall building exposed to rain is taken as _____ of the gross area.

7/24

The sizing data for vertical conductors, leaders. and drains is based on the pipes flowing _____ full

0. 392

Gutter has Semi-Circular bottom. Depth of equivalent area of rectangular gutter = _____ x diameter.

0.8862

Width of Rectangular Gutter = _____ x Diameter

Independent System

Combined System

Natural System

3 major systems of collecting storm water.

Separate system

Independent system is also called as ________.

Independent System

Storm drain and house drain are separately conveyed into different proper disposal terminals.

Combined System

Storm drain and house drain are jointly conveyed into 1 disposal terminals; prohibited system.

Natural System

Rainwater are collected by natural means of collections such as open tanks or cisterns.

Gutter

Roof Drain

Downspout

Shoe/Splash Pans

Catch Basin

Roofing Elements of Rainwater System

Gutter

Usually come in circular bottom shapes and built around the perimeter of the roof.

Roof Drain

Usually made from dome-type strainers and previous objectionable materials to enter the downspout

Downspout

Vertical pipe conveying the storm wastewater from the gutter into the catch basin; the vertical portion of a rainwater conductor.

Shoe/Splash Pan

Directly pointed into the catch basin and lowers the striking effect of the wastewater into the ground.

Catch Basin

Terminals of downspouts that deliver water to the sewers in the street via gravity; a receptacle in which liquids are retained for a sufficient period of time to allow settleable material to deposit.