Report of a committee on a plan for cleansing the drains of Black Town.

Date:
1856
Catalogue details

Licence: Public Domain Mark

Credit: Report of a committee on a plan for cleansing the drains of Black Town. Source: Wellcome Collection.

    97/105 (page 89)
    BY LIEUT. COL. A. T. COTTON. together with that which follows, that the supply would bo received as fol- lows ; the evaporation from the surface of the tank id taken at an average of 13 years. ivccci\ en. Expended. Total Expen- diture. Remaining in tanks. On evaporation usefully. UULLLllOll OUUIL. Million cubic Million cubic lYTillinn piiIiip TvMllm'n f>niii'/i -1*1 III 1*1] 1 LUiJH yards. yards. yards. yards. yards. 32 14 14 28 4 „ June 12 14 2 16 0 July 32 12 20 32 0 „ August. ... 48 18 20 38 10 „ September. 52 15 20 35 27 „ October.... 14 17 25 42 129 „ November. 183 15 25 40 tank surplusing. „ Dei-ember.. 65 16 25 41 Do. „ January... 10 20 25 45 67 „ February.. none 15 15 30 37 none 10 15 25 12 » April 6 5 13 18 0 171 219 390 Erorn these two tables it appears that in an average year— That in the months of September, October and November, water would be flowing over the calingulahs and out to sea by the Adyar; and that the quantity thus run out would be=579—219= 360 million cubic yards. The basin appears to be generally rather flat, and it is interspersed here and there with rocks and little hills, like the Paleveram ones, whence ample supplies of granite may be obtained. It is further to be remarked that the projected Channel from the Palaur at Areot, terminates in the head of the basin of the Adyar, so that water can be led by that line into these tanks.