Answered for Carmel, Hamilton County.
Roots need oxygen, and water fills the pore space that delivered it. The tree is suffocating rather than drowning, and fine absorbing roots die within days in oxygen-free soil, so the tree shows drought symptoms while standing in water. Past the root loss, saturated soil shifts chemically and favors water-mold pathogens like Phytophthora that attack the root collar. Saturated soil also grips a root plate far more weakly than dry soil does, so a tree that was stable last week may not be this week. In Carmel — Village of WestClay, Brookshire and Woodland Springs included, that's normally a hazardous tree removal job at $800–$5,000. Within days.
Duke Energy Indiana. It runs a five-year distribution trim cycle, clearing roughly 20% of distribution line miles each year, gives Indiana customers a minimum of 14 days' notice before planned pruning, and files an annual vegetation management report with the IURC each March 31. Methods include pruning, mechanical trimming, brush mastication, herbicide application and hazard-tree removal.
Carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it.
Carmel's code section 6-64 is titled "Planting and Removal of Trees and Shrub Regulations" and sits in the streets-and-sidewalks division of Chapter 6, alongside 6-55 covering trees and shrubs that obstruct streets and sidewalks — so the city's active regulation is aimed at the public way, plus landscape and buffer plantings approved through development plan review by Urban Forestry. I could not verify the exact text of 6-64 or confirm whether any permit applies to removing a tree standing entirely in a private back yard; contact Carmel Urban Forestry through the city's Department of Community Services before assuming, and check HOA covenants, which in most Carmel subdivisions are stricter than the city.
The strip between sidewalk and curb is city right-of-way, and Carmel Urban Forestry plants and maintains the street trees in it, including species selection. Many Carmel subdivisions layer a platted landscape easement and HOA covenants over that same ground, so two approvals can apply to one tree.
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Distance measured from Carmel.