add pages for release 2.0.0

README.md

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+# [Version 2.0.0 Release](/pywatershed/2024/11/14/v2-0-0-overview)
+The second release of pywatershed! [Read more ...](/pywatershed/2023/11/14/v1-0-0-overview)
+
 # [Version 1.0.0 Release](/pywatershed/2023/12/18/v1-0-0-overview)
 The first official release of pywatershed! [Read more ...](/pywatershed/2023/12/18/v1-0-0-overview)

_posts/2024-11-14-v2-0-0-overview.md

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+---
+layout: post
+title: ""
+date: 2024-11-18 14:20:00 -0700
+categories: releases
+tags: 2.0.0
+---
+
+# Version 2.0.0 Extended Release Notes
+
+These are the extended release notes. The official release notes are found
+[here](https://github.com/EC-USGS/pywatershed/releases/tag/2.0.0).
+
+## Purpose and scope of pywatershed version 2.0.0
+
+These notes summarize the more detailed [What's New for version 2.0.0](https://pywatershed.readthedocs.io/en/latest/whats-new.html#v2-2-0-14-november-2024) in the documentation.
+
+### `FlowGraph`
+The primary new capability introduced is the `FlowGraph` and its related classes.
+The `FlowGraph` allow users to combine different kinds flow solutions on `FlowNodes` in
+arbitrary order. While `FlowGraph`s may be constructed from scratch, a common use case
+(demonstrated in a new example notebook, 06) is to add a reservoir representation
+into an existing `FlowGraph` which is equivalent to `PRMSChannel`. The STARFIT
+reservoir representation is implemented as a `FlowNode` which can be added into
+the `FlowGraph`. Other `FlowNodes` implemented are `PassThroughFlowNode` and
+`ObsInFlowNode`. The second reproduces the "obsin" capabilities present in PRMS.
+Please see the [`FlowGraph` documentation](https://pywatershed.readthedocs.io/en/latest/api/generated/pywatershed.FlowGraph.html#pywatershed.FlowGraph) for additional details.
+
+
+### Additional PRMS functionalities
+- Subclasses of PRMSRunoff, PRMSSoilzone, and PRMSGroundwater are available
+  which do not include depression storage: PRMSRunoffNoDprst, PRMSSoilzoneNoDprst, and PRMSGroundwaterNoDprst.
+- Dunnian flow is implemented in PRMSSoilzone and is 2-way coupled to PRMSRunoff.
+- Preferential flow is implemented in PRMSSoilzone.
+
+
+### `MmrToMf6Dfw`
+The `MmrToMf6Dfw` class builds a MF6 1-D channel (CHF) simulation using diffusive wave
+DFW) routing from PRMS NHM input files and a few simple assumptions. The
+lateral (to-channel) fluxes from a PRMS are used as time varying boundary
+conditions. A new example notebook (07) runs the Delaware River Basin using MF6 CFH-DFW.
+
+
+### Breaking Changes
+The parameter `pref_flow_infil_frac` is now a required parameter input for PRMSSoilzone. The
+NHM values assumed previously are zeros on all HRUs.