13000000095 Santa Maria Dam Inundation Report

• Contract/PO #: 13000000095
• Contractor Name: Santa Maria Reservior Company
• Contract Type: Grant
• Water District: 20
• County: Hinsdale
• County: Mineral
• Loan Projects - Doc Type: Report

PROJECT:
82.0
40210.0
621.0
16.0
90.0
3.0
2.0
2.0
0.75
Large
3297220
340976.2
241.0
424.5
244.5
3.53
490.4
134991
4.72
120.2
1.5
Cubic Yards
Feet (In Direction of Flow)
Reservoir Surface Area at Hw (As) =
Breach side-slope ratio (Zb) =
Z(H):1(V)
Z(H):1(V)
Feet
Dam Size Class:
Crest width of dam (C) =
Feet
Z(H):1(V)
ESTIMATION OF DAM BREACH PARAMETERS
Height of water over base elevation of breach (Hw) =
Volume of water stored in reservoir at time of failure (Vw) =
Santa Maria Reservoir
EARTHEN (COHESIVE)
WITH ALL FAILURE TIMES ESTIMATED BY WASHINGTON STATE METHOD
Acre-Feet
Feet
BREACH INPUT PARAMETERS:
Select Embankment Type From Drop-Down Menu:
Average Breach Width (Bavg) =
USING THE MACDONALD & LANGRIDGE-MONOPOLIS OR WASHINGTON STATE METHODS
Acres
Hours
Breach Formation Factor (BFF) =
Embankment Volume Eroded (Ver) =
Average Dam Width (Wavg) =
CALCULATED BREACH CHARACTERISTICS:
Height of breach from dam crest to base elevation of breach (Hb) =
Slope of upstream dam face (Zu) =
Slope of downstream dam face (Zd) =
Feet
Piping Orifice Coefficient (Cp) =Used To Calculate Peak Discharge Through Piping Hole
RESULTS CHECK:
Erosion Rate Divided by Height of Water Over Base of Breach (ER/Hw) =If 1.6 < (ER/Hw) < 21, Erosion Rate is Assumed Reasonable
Assumes Full Reservoir At Time of Breach
Bottom Width of Breach (Bb) =Feet
Breach Formation Time (Tf) =
Peak Breach Discharge (Qp) =Cubic Feet per Second
Erosion Rate (ER), Calculated as (Bavg/Tf) =
Average Breach Width Divided by Height of Breach (Bavg/Hb ) =If (Bavg/Hb) > 0.6, Full Breach Development is Anticipated
Acre Feet/FootStorage Intensity (SI) =
SANTA MARIA MLM-WA.xlsm