FLOOD03449

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: Colorado Flood Proofing Manual
• Date: 10/1/1983
• Prepared For: State of Colorado
• Prepared By: CWCB
• Floodplain - Doc Type: Educational/Technical/Reference Information

65

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Tank Capacity
(gallons)
275
500
1,000
1,5000

Minimum Volume of
Concrete Needed
(yd3)
0.73
1.46
2.92
4.36

r

~ FUEL TANK LEG

ANCHOR BOLT
OR
THREADED BAR
(1/2"MIN, DIAM.)

--- WASHER AND NUT

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Figure 7,11, Anchor bolts for stor~ge tanks, (Reference 30)

7.3.3 Waterproofing

Waterproofing a structure involves the use of construction methods and materials to prevent
water, water vapor, and waterborne contaminants Horn reaching interior spaces. The degree
of water proofing may be classified as completely cjry (Class A), essentially dry (Class B), or
wet (Class C). The discussion which follows will be: primarily limitE,d to requirements for
Class A By Corps of Engineers's definition, waterpr~ofed construction is completely imper-
meable when no more than three pounds of water pass through 1,000 square feet of mem-
brane in 24 hours at 40 psi.

Three basic methods of waterproofing exist - exte~nal lining, internal lining, and integral
waterproofing, An external lining should be continuf)us over a concrete floor slab and con-
crete or reinforced concrete masonry walls. The US~ of a continuous external membrane
requires that floor slabs be rigidly connected with walls to act monolithically,

Materials used for external membranes should be layered sheet construction of tar/asphalt
bitumen and felts, at least 3-ply in thickness neopr~ne coated nylon fabric. Other sheet
material may also be approved if they meet all applicable American Standards for Testing
and Materials (ASTM) standards, and they are desig!necl for resistance to expected flood con.
ditions. Plastic waterproofing materials that may be used include polyethylene, PVe,
polyurethane, and polyisobutylene.