CONTENTS - Central Public Works Department

366 APPENDIX 4
PROFORMA 3-C OF APPENDIX- 4
CENTRAL PUBLIC WORKS DEPARTMENT
No. Dated, the
To
The Executive Engineer,
.............................
.............................
Name of Work:
Kindly furnish the following information for the above work of sewerage scheme of the area as early
as possible in order to enable this office to prepare project estimate for the same.
1 (a) What is the extent of the area for which sewerage scheme is to be designed?
(b) What is existing population?
(c) What is the proposed ultimate density of population?
(d) What is the per capita water supply?
2. Give a site plan of the whole area showing the existing and proposed buildings and other structures,
spot levels at intervals of 60m, and ground formation levels alongside of all main and service roads
(existing or proposed).
3. Is there any sewerage system in the area? If so, the following particulars should be furnished:
(a) Size of the nearest sewer and its distance from the site.
(b) Size of the nearest trunk sewer and its distance from the site.
(c) Whether the existing sewer is capable of taking the additional sewage from the site to be
developed. If not, state alternative proposals for disposal of sewage.
(d) If the existing sewer is capable of taking the additional sewage, give “L” section of the sewer for a
reasonable length showing the ILs, GLs., gradients and falls, if any, as well as position of manhole
to which the proposed sewer from the colony to be developed may be conveniently connected.
(e) What is the level of sewage in the manhole reference to (d) above for peak discharge.
(f) A plan showing the layout of the branch or trunk sewer, and proposals for the outfall sewer
connecting to manhole with invert and ground levels.
4. Whether the proposed outfall sewer from the area to be developed will have to be designed to carry
sewage from any other area also. If so, the additional areas to be served may be shown on the site
plan giving their extents with the present and anticipated density of population.
5 (a) Whether a long outfall sewer is necessary? If so, give a plan and longitudinal section of the
proposed alignment showing the ground levels.
(b) What is the nature of the soil and sub-soil along the proposed alignment?
(c) State the ownership of the land through which the proposed alignment passes.
(d) Are there any obstructions, e.g. railway lines, drainage courses etc., on the alignment? If so,
their nature and other relevant details may be given.
6. If there is no sewerage system in the area
(a) How do you propose to dispose of the sewage?
(b) A survey plan showing the likely location of the disposal works (septic tanks or other plants)
may be furnished showing the prevailing direction of wind.
(c) How is the effluent proposed to be disposed off? If there is any natural water course in which
the effluent is proposed to be discharged, the following particulars should be furnished:
(i) Normal water level and H.F.L.
(ii) Specify if there are any objections to discharge the effluent into the water-course or
Nallah, and if so, what alternative do you suggest?
(d) Nature of soil, i.e. whether it is absorbent or otherwise.