Guidelines for DPR are at CWC ...
Published by Shiv Kumar Sharma, Senior Joint Commissioner (Policy and Planning) - MoWR, RD & GR, Govt. of India
Guidelines for DPR are at CWC website http://www.cwc.nic.in/main/webpages/Guide lines_&_Guide books_publications.html However in most of cases (in my personal viewpoint) the hurdles are Environmental issues, interstate issues, lack of investigation and Conceptual Planning.