Large scale land survey; building a Hydrology Model Over the course of three months a large scale land survey was carried out on the Lower Mill Estate in the Cotswolds. The site is made up of a number of lakes, the areas between which are being developed with second homes; as well as facilities such as a Spa, Swimming Pool, Tennis Courts and Restaurants. The Thames also runs through the site and feeds into the lakes. The purpose of the survey was to aid the companies hydrolog