Water purification, distribution and sewage disposal for Peace Corps volunteers
 Contents Preface Section 1: Water supply sources Section 2: Water treatment Section 3: Planning the distribution system Section 4: Characteristics of an adequate system Section 5: Construction techniques Section 6: Operation and maintenance Section 7: Scope of disposal system projects in host communities Section 8: The privy method of excreta disposal design for a village Section 9: Water carried sewage systems construction and maintenance Appendix A Appendix B Bibliography

### Appendix B

This foldout chart is useful for quick conversion from meters and centimeters to feet and inches or vice-versa. For distances greater than three meters, or more accurate results, the tables or conversions equations must be used.

The chart (page ) has metric division of one centimeter to three refers, and English graduations in inches and feet to ten feet. It is accurate to about plus or minus one centimeter. Folding out the chart makes a handy reference when studying other drawings in the Handbook.

For more accurate results the tables belowl

An example may help explain how to use tints type of table. Suppose you wish to find how many inches are equal to 66 cm. On the cm. to in. table look down the leftmost column to 60 cm., and then right to the column headed 6 cm. This gives the result, 25.984 inches.

INCHES INTO CENTIMETERS

(1 in. = 2.539977 cm)

 inches 0 1 2 3 4 5 6 7 8 9 0 cm 2.54 5.08 7.62 10.16 12.7 15.24 17.18 20.32 22.86 10 25.40 27.94 30.48 33.02 35.56 38.1 40.64 43.18 45.72 48.26 20 50.80 53.34 55.88 58.42 60.96 63.5 66.04 68.58 71.12 73.66 30 76.20 78.74 81.28 83.82 86.36 88.9 91.44 93.98 96.52 99.06 40 101.80 104.14 106.68 109.22 111.76 114.3 116.84 119.38 121.92 124.46 50 127.00 129.54 132.08 134.62 137.16 139.7 142.24 144.78 147.32 149.86 60 152.40 154.94 157.48 160.02 162.56 165.1 167.64 170.18 172.72 175.26 70 177.80 180.34 182.88 185.42 187.96 190.5 193.04 195.58 198.12 200.66 80 203.20 204.74 208.28 210.82 213.36 215.9 218.44 220.98 223.52 226.06 90 228.60 231.14 233.68 236.22 238.76 241.3 243.84 246.38 248.92 251.46

CENTIMETERS INTO INCHES

(1 cm. = 0.3937 in.)

 cm 0 1 2 3 4 5 6 7 8 9 0 inches 0.394 0.787 1.181 1.575 1.969 2.362 2.756 3.15 3.543 10 3.937 4.331 4.724 5.118 5.512 5.906 6.299 6.693 7.087 7.48 20 7.874 8.268 8.661 9.055 9.449 9.843 10.236 10.63 11.024 11.417 30 11.811 12.205 12.598 12.992 13.386 13.78 14.173 14.567 14.961 15.354 40 15.748 16.142 16.535 16.929 17.323 17.717 18.11 18.504 18.898 19.291 50 19.685 20.079 20.472 20.866 21.26 21.654 22.047 22.441 22.835 23.228 60 23.622 24.016 24.409 24.803 25.197 25.591 25.984 26.378 26.772 27.165 70 27.559 27.953 28.346 28.74 29.134 29.528 29.921 30.315 30.709 31.102 80 31.496 31.89 32.283 32.677 33.071 33.465 33.858 34.252 34.646 35.039 90 35.433 35.827 36.22 36.614 37.088 37.402 37.795 38.189 38.583 38.976

EQUATIONS

 1 inche = 2.54 cm. 1 foot = 30.48 cm. = 0.3048 m. 1 yard = 91 .44 cm. = 0.9144 m. 1 mile = 1.6. km. 1 cm. = 0.3937 in. 1 m. = 39.37 in. = 3.28 ft. 1 km. = 0.62137 mile

Meters and centimeters