Temporary Diversion Sizing When Working in Waterways
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1 Temporary Diversion Sizing When Working in Waterways DAVID BENNETTS URBAN DRAINAGE AND FLOOD CONTROL DISTRICT SHANNON TILLACK WRIGHT WATER ENGINEERS
2 Evolution of Temporary Diversion Sizing Methods Contractor s Judgment Contractor developed diversions based on a number of factors: Time of Year Duration of project Base flow of drainageway Area of Project site What they were building and how General concurrence of owner Amount of risk they were willing to assume
3 Evolution of Temporary Diversion Sizing Methods Examples
4 Evolution of Temporary Diversion Sizing Methods Examples
5 Evolution of Temporary Diversion Sizing Methods Erosion MS4 Permits Changes in Construction Stormwater Management
6 Evolution of Temporary Diversion Sizing Methods Changes in Construction Stormwater Management Construction BMP s District developed guidance on construction BMP s in Volume 3 of Criteria Manual Guidance in sizing temporary diversions
7 Evolution of Temporary Diversion Sizing Methods District Volume 3 Criteria Manual TDC Fact Sheet SM8 Consider a number of options when sizing a temporary diversion Time of Year Duration of project Base flow of drainageway Site disturbance Type of work being done TDC sizing procedure using Nomograph
8 Evolution of Temporary Diversion Sizing Methods MS4 Permits 2 year diversion requirement Requirement to size all TCD using 2-year peak flows Disturbance to site Additional Costs One size does not fit all
9 Evolution of Temporary Diversion Sizing Methods Examples
10 Evolution of Temporary Diversion Sizing Methods Examples
11 Evolution of Temporary Diversion Sizing Methods Examples
12 Design Process Step 1: Determine if diversion is appropriate Step 2: Determine project duration Step 3: Determine time of year of construction Step 6: Determine appropriate method of diversion Step 5: Perform sizing calculations & use engineering judgment Step 4: Gather diversion sizing parameters
13 Step 1: Determine If Diversion Is Appropriate 1. Cause greater environmental impacts than without diversion 2. Consequences of exceeding diversion capacity 3. Cost to construct diversion Factors to Consider 4. Availability of space/limited ROW 5. Permitting requirements
14 Step 2: Determine Project Duration Short Duration Projects Completed within one month or less Long Duration Projects Lasts longer than three months Interim Duration Projects
15 Step 3: Determine Time of Year of Construction November March: Lower risk of rainfall/runoff events April October: Higher risk of rainfall/runoff events Step 4: Gather Sizing Parameters 1. Tributary area 2. Imperviousness 3. Project duration safety factor 4. Seasonal sizing coefficient
16 Step 5: Perform Sizing Calculations Short Duration Projects Long Duration Projects Interim Duration Projects USE ENGINEERING JUDGMENT!
17 Basis of Sizing Criteria Crest Stage Indicator (CSI) Data: 30 years, 21 gages in metropolitan area Estimate of peak flow for each month from April through September Observation of the conditions at the site Estimation of baseflow at time of visit
18 Sizing Methodology: Short Duration Projects Time of Year November - March November - March Project Duration Safety Factor, C Sizing Coefficient, K < 2 weeks weeks 1 month Tributary Area, A Safety Factor, C April - October < 2 weeks (during dry weather conditions) Sizing Coefficient, K April - October 2 weeks 1 month Calculated Diversion Design Flow (cfs): Q = C K A
19 Example: Short Duration Project Example: Goldsmith Gulch Bank Stabilization 0.12 acres of disturbance Completed within 2 weeks during Nov March time period Tributary Area = 6.2 mi 2 Factors for Short Duration Projects Time of Year Nov - March Project Duration <2 weeks Safety Factor, C Q = C K A Sizing Coefficient, K Q = mi 2 Q = 1.3 cfs
20 Sizing Methodology: Long Duration Projects In-Progress Temporary Diversion Method Sizing Nomograph for Long Duration Projects Based on 2-Year Peak Flows
21 Lakewood Gulch
22 Example: Long Duration Project Example: Rock Creek at Rock Creek Farm Tributary Area = 3 mi 2 Factors for Long Duration Projects Watershed Imperviousness = 10% Q = 50 cfs
23 Sizing Methodology: Interim Duration Projects Combination of sizing methods Weigh flow rates in combination with site-specific factors Apply engineering judgment
24 Step 6: Determine Method of Diversion 1. Temporary Diversion 2. Coffer Dam or Berm Channel
25 Step 6: Determine Method of Diversion 3. Piped Diversion 4. Pumped Diversion
26 REVISED FACT SHEET Available in Summer 2012
27 Dave Bennetts: Shannon Tillack:
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