Contents preface (VII) introduction 1—37

Table 1.1 Storage of some major dams (2)

Dam	Height (m)	Storage (million cubic metres)
Bhakra (India)	226	11,320
Kishau (India, projected)	244	1,980
Tehri (India, projected)	260	3,550
Hoover (U.S.A.)	222	38,600
High Aswan (Egypt)	97	156,000

1.2. IMPACT OF IRRIGATION ON HUMAN ENVIRONMENT
The main impact of irrigation is in terms of the increased agricultural yield which, in turn, affects social, cultural, economic, political and other aspects of human environment (Table 1.2)

Table 1.2 Impact of irrigation on human environment (3)

Impact

Positive

Negative

Engineering

Improvement of the water regime of

Danger of waterlogging and

irrigated soils.

salination of soils, rise in ground

water table.

Improvement of the micro climate.

Changing properties of water in

Possibility provided for waste water

reservoirs. Deforestation of area

use and disposal.

which is to be irrigated and with it a

change of the water regime in the

area. Reservoir bank abrasion.

Retention of water in reservoirs and

possible multipurpose use thereof.

(Contd )...

INTRODUCTION

3

Impact