FLOOD00275

• County: Adams
• Community: Westminster
• Title: Bruchez Farms Property - Big Dry Creek at Wadsworth Parkway
• Date: 1/1/1998
• Prepared For: Bruchez Farm
• Prepared By: Wright Water Engineers Inc
• Floodplain - Doc Type: Floodplain Report/Masterplan

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10

In the 1986 study was 5,150 cfs. This resulted In a water surface elevation on the
Bruchez property upstream of Wadsworth Parkway of 5365.0. The actual peak
discharge rate from the 1986 study at this location was '1,910 cfs. This reduces the
water surface elevatIon upstream of Wadsworth Parkway to 536'1. O.

WIth the Inclusion of the completed Improvements at Ketner Reservoir, the peak

discharge rate just upstream of the C&S Rail road Is decreased to '1,5'10 cfs. This

reduces the water surface elevatIon upstream of Wadsworth Parkway to 5362.8.

IMPROVED INLET

AddItional measures to decrease the water surface elevation even further can be

Introduced. One of these is to Improve the hydraulic effIcIency of the Inlet to the

ran road culvert.

At most culverts, water Is ponded and quiescent upstream of the Inlet. In order to

flow through the culvert, suff1clent head (depth) must be built up to accomplish two

things: 1) change static energy (depth) into kinetic energy (velocity) to allow the

water to flow through the culvert and 2) get the water from just outside the culvert

to just Inside the culvert (entrance loss).

ThIs entrance loss is a functIon of the Inlet geometry and Is measured in terms of an
entrance loss coefficient times the velocity head (y2I2g), where Y Is the velocity in
feet per second and g Is the acceleration due to gravity. Efficient entrance geome-
try can reduce the entrance loss coefficient from 0.9 to 0.2.