what books should i refer for GIS modelling and water resource management?

Hydraulic Modeling and GIS book by ESRi is a good source http://esripress.esri.com/display/index.cfm?fuseaction=display&websiteID... see if this works for you.

Hi Melissa, what software are you planning on using!! a lot of literature is software dependent.

For a discussion on opensource software:
http://publications.jrc.ec.europa.eu/repository/bitstream/111111111/1055...

ESRI Resources:
http://www.esri.com/industries/water_resources/business/literature


There are a lot of GIS books on water resource management - but have not read any so could not recommend any.
http://www.crcpress.com/product/isbn/9780415286077