Final Baseline Hydrology Report - October 2012 - Urban Drainage ...
Final Baseline Hydrology Report - October 2012 - Urban Drainage ...
Final Baseline Hydrology Report - October 2012 - Urban Drainage ...
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1601 Blake Street, Suite 200<br />
Denver, Colorado 80202<br />
(p) 303.572.0200<br />
(f) 303.572.0202<br />
www.matrixdesigngroup.com<br />
MEETING MINUTES<br />
Sanderson Gulch<br />
Major <strong>Drainage</strong>way Plan and Flood Hazard Area Delineation<br />
Tuesday July 17, <strong>2012</strong>, 8:00am – 10:00am at UDFCD<br />
Attendees:<br />
Shea Thomas UDFCD 303-455-6277 sthomas@udfcd.org<br />
Bill DeGroot UDFCD 303-455-6277 bdegroot@udfcd.org<br />
Terry Rogers Lakewood Engineering 303-987-7934 terrog@lakewood.org<br />
John Paliga Lakewood Community Resources 303-987-7815 johpal@lakewood.org<br />
Mike Anderson Denver Capital Projects 720-865-3023 mike.anderson@denvergov.org<br />
David Marquardt Denver Parks 720.913.0629 david.marquardt@denvergov.org<br />
Kevin Lewis Denver Public Works 303-446-3658 donald.lewis@denvergov.org<br />
Robert Krehbiel Matrix Design Group - Eng 303-572-0200 robertk@matrixdesigngroup.com<br />
George Slovensky Matrix Design Group – Eng 303-572-0200 george_slovensky@matrixdesigngroup.com<br />
HungTeng Ho Matrix Design Group – Eng 303-572-0200 hungteng_ho@matrixdesigngroup.com<br />
Bob Eck Matrix Design Group – LA 303-572-0200 bob_eck@matrixdesigngroup.com<br />
Ian Anderson Matrix Design Group – LA 303-572-0200 ian_anderson@matrixdesigngroup.com<br />
Jane Kopperl Matrix Design Group – LA 303-572-0200 jane_ kopperl@matrixdesigngroup.com<br />
1. Project Coordination<br />
a. Meet Monthly – Next meeting in approximately 4 weeks for <strong>Hydrology</strong><br />
b. Web Site to be set up by Matrix<br />
2. Data Gathering<br />
a. Aerial base mapping Lakewood – received from UDFCD (The mapping is for the drainageway<br />
floodplain mapping and does not cover the entire upper watershed for the hydrologic model,<br />
especially, the area around the intersection of Kipling & Jewell and Kendrick Lake No.1.)<br />
b. Structure survey information – received from UDFCD<br />
c. 1972 hydrology Technical Appendix – received from UDFCD (The two binders of hardcopy named<br />
Sanderson Gulch FHAD provide data for HEC-2 input. The hydrology information of the 1972<br />
Study is not included except six rating curves. Four of the six rating curves are for the Clairefield<br />
Reservoir, Green Gable Entrance Road, Green Gable GC and Kendrick Reservoir in the<br />
Sanderson Gulch. The other two rating curves are for the KLIR Reservoir and Wadsworth &<br />
Florida in North Sanderson Gulch.)<br />
d. Survey information of detention areas – this may be requested later if needed<br />
e. Survey of thalweg at drop structures – this may be requested later if needed<br />
f. Historic aerial of outfall 1933 – Matrix is in the process of obtaining from Denver<br />
g. Parks data – available in GIS. David Marquardt to set up tour of the corridor.<br />
h. Mike Anderson to provide structural assessment from bridges group.<br />
3. Contacts:<br />
a. Irrigation Ditch Co. – Matrix to provide name of ditches to Lakewood for contact info.<br />
i. Salisbury lateral owned by Denver Water and Denver Parks<br />
ii. Agricultural Ditch Company contact is Gary Theander<br />
iii. Ward Canal<br />
Sanderson Gulch Meeting Minutes July 17, <strong>2012</strong><br />
b. Green Gables Development<br />
i. Official development plan available<br />
ii. CLOMR application submitted last week<br />
1. CLOMR based upon ~900 cfs<br />
2. Systems build for ~1800 cfs per their current modeling<br />
iii. Inertia and Wright Water Engineers working for the developer<br />
c. Burlington Northern Railroad – UDFCD working with them for a trail under RR at West Harvard<br />
4. Project Schedule<br />
a. 46 Weeks by contract (showing 42 weeks by cutting 4 weeks from <strong>Hydrology</strong>)<br />
b. Concurrent FHAD<br />
SANDERSON GULCH MDP & FHAD SCHEDULE<br />
Draft / First Comments <strong>Final</strong>/Second Public Meeting Selected Plan<br />
<strong>Baseline</strong> <strong>Hydrology</strong> <strong>Report</strong> 8/27/<strong>2012</strong> 9/17/<strong>2012</strong> 10/8/<strong>2012</strong><br />
Alternatives Analysis 11/19/<strong>2012</strong> 12/10/<strong>2012</strong> 1/4/2013 January 2013 1/28/2013<br />
Concept Design 3/25/2013 4/15/2013 5/6/2013 April 2013<br />
FHAD 11/5/<strong>2012</strong> 11/26/<strong>2012</strong> 12/17/<strong>2012</strong><br />
5. Project Approach<br />
a. <strong>Hydrology</strong>: Existing Conditions = Future Conditions if add Green Gables Development<br />
i. Develop “Duplicate Effective” model using values from 1972 model<br />
1. Set up model is in 1972, but with smaller basins<br />
2. Recreate previous detention ratings curves<br />
3. With all parameters the same, calibrate the new model to the old results<br />
4. Correct the model with updated rainfall, impervious, soils data, etc.<br />
5. Correct detention rating curves as needed<br />
6. Use future imperviousness for Green Gables<br />
ii. Detention (6 in previous study in Lakewood)<br />
1. Only dedicated detention facilities can be considered in FHAD<br />
2. Only ponds with adequate assurances agreement<br />
3. Inadvertent detention not allowed for FHAD studies unless an agreement with<br />
UDFCD is executed.<br />
4. <strong>Baseline</strong> report based upon existing detention<br />
5. Alternatives analysis can consider the value of other detention facilities<br />
6. Green Gables – detention has been formalized<br />
b. Hydraulics<br />
i. New Channel centerline<br />
1. Stationing zero at South Platte River<br />
2. Stationing zero for North Sanderson at confluence<br />
ii. Model Limits – extend same limits as UDFCD floodplains into Smith Reservoir<br />
iii. Tie into 10-year WSE of South Platte River<br />
iv. Junction for North Sanderson and Mississippi Gulch Alternative<br />
v. UDFCD has recently updated DFHAD guidelines<br />
c. Define Reaches as needed<br />
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