This document provides guidelines for cost estimation of river valley projects as per the Department of Water Resources, River Development and Groundwater guidelines. It outlines the procedures for preparing cost estimates at different stages - the detailed project report, revised cost estimate if costs increase by over 15%, and the completion cost estimate. It describes the various components to be included in the capital cost estimate such as investigation, design, construction, contingencies, and provides templates for calculating unit costs for structures like head regulators, cross regulators, falls, and bridges. Guidelines are given for estimating costs of items like buildings, earthworks, plantations, tanks and reservoirs, and miscellaneous works.