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10th International Rainwater Catchment Systems Conference
"Rainwater International 2001"
Mannheim, Germany - September 2001

Section 3: Rainwater: Quality Issues

Paper 3.4

Health Implications of Widespread Use of DRWH: Mosquito Control

P.K. Mittal, Namrata Pathak, Padma Vasudevan, Terry Thomas
Centre for Rural Development & Technology
Indian Institute of Technology, Delhi
Hauz Khas
New Delhi-110016
email: namratapathak@hotmail.com

Introduction

Mosquito borne diseases like malaria and dengue are of primary concern, especially in tropical countries. It is well known that the availability of stagnant water generally leads to mosquito breeding. Hence in considering health issues related to DRWH, the risk of mosquito breeding and consequent spread of diseases borne by them need to be evaluated. Measures have to be taken to minimise the risk. Under an EU sponsored project, special features required for reducing the risk of mosquito breeding in DRWH design, were studied.

Denying access to water is universally effective in controlling breeding of all mosquito species. Preventing stagnation of water on the gutter and putting up suitable barriers for barring the entry of adult mosquito into DRWH are most useful, but not always feasible. If, in spite of preventive measures, mosquito enters the storage tank, appropriate measures for deterring ovi position and larval growth have to be considered. Accordingly, the following three aspects were examined:

  1. Barriers for preventing the approach of adult mosquitoes to water in DRWH. 
  2. Quality of water and other parameters which discourage or encourage ovi-position and larval growth. 
  3. Treatment of water in storage for control of breeding.

Some of the results are discussed herein.

PDF of full document (4pp, 27kb)


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