Dd No 1 (Hamm-Nuttle) is a crucial flood risk reduction structure located in the Upper Walnut Watershed in Kansas. Built in 1978 by the USDA NRCS, this earth dam stands at a height of 28 feet and spans 1330 feet, with a storage capacity of 540 acre-feet. The dam plays a significant role in protecting the surrounding area from potential flooding events along the Walnut River, with a maximum discharge capacity of 298 cubic feet per second.

Owned and regulated by the local government and the Kansas Dept. of Agriculture, Dd No 1 is deemed to have a low hazard potential with a moderate risk assessment rating. Despite its importance in flood risk reduction, the dam's condition assessment remains unrated, highlighting the need for regular inspections and maintenance. The structure also lacks an Emergency Action Plan (EAP) and inundation maps, underscoring the importance of preparedness and risk management measures for water resource and climate enthusiasts in the region.

As a key piece of infrastructure in Butler County, Kansas, Dd No 1 serves as a vital component in the overall water resource management strategy for the area. With its strategic location and design, the dam not only provides flood protection but also contributes to the overall resilience of the local community in the face of changing climate patterns. Ensuring the continued safety and functionality of Dd No 1 will be essential in safeguarding the region's water resources and mitigating the impacts of climate-related events in the future.