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Given a contact three manifold $Y$ with a nondegenerate contact form$\lambda$, and an almost complex structure $J$ compatible with $\lambda$, itsembedded contact homology $ECH(Y,\lambda)$ is defined (arXiv:1303.5789) andonly depends on the contact structure. In this paper we explain how to computeECH for Morse-Bott contact forms whose Reeb orbits appear in $S^1$ families,assuming the almost complex structure $J$ can be chosen to satisfy certaintransversality conditions (this is the case for instance for boundaries ofconcave or convex toric domains, or if all the curves of ECH index one havegenus zero). We define the ECH chain complex for a Morse-Bott contact form viaan enumeration of ECH index one cascades. We prove using gluing results fromarXiv:2206.04334 that this chain complex computes the ECH of the contactmanifold. This paper and arXiv:2206.04334 fill in some technical foundationsfor previous calculations in the literature (arXiv:1608.07988,arXiv:math/0410061).

Computing Embedded Contact Homology in Morse-Bott Settings