cdbg‐mit grant application cloverleaf drainage improvements · the preliminary project consists...

CDBG‐MIT Grant Application Cloverleaf Drainage Improvements

Harris County Flood Control District is seeking assistance through the 2016 Floods State Mitigation Competition under the Community Development Block Grant Mitigation (CDBG-MIT) program for the following flood risk reduction project. The CDBG-MIT program is funded through the United States Department of Housing and Urban Development (HUD) and administered at the state level by the Texas General Land Office (GLO). Applications are due to GLO by October 28, 2020 and awards are expected in 2021.

I. SCOPE:

The Cloverleaf Stormwater Drainage Improvements will serve a portion of the Carpenters Bayou watershed. The project service area is a 473-acre residential area comprised of structures built between the 1940’s-1980’s and is plagued by drainage challenges and frequent flooding. The service area also includes one critical facility (elementary school), a cemetery, a wetland area, and some cultural resources. The preliminary project consists of a proposed combination of roadside ditch improvements, construction of a trunk line (trunk line #1) and a 109 acre-feet stormwater detention facility north of the San Jacinto Funeral Home & Memorial Park, for an approximate combined 50yr Level-of-Service (LOS). This project is aimed at providing much needed drainage relief for this portion of Cloverleaf with the use of a stormwater trunk line serving as a centralized drainage “artery” and for allowing lateral tie-ins from roadside ditch connections, before safely out falling into proposed detention basin. Proposed trunk line #1 consists of a buried 9 feet x 7 feet reinforced concrete box (RCB) with an alignment along Nancy Rose Street beginning with its headwaters near Victoria Street, turning eastward along Hillsboro Street, and out falling into the proposed detention facility north of the San Jacinto Funeral Home & Memorial Park. Please note that there is flexibility in the placement of the tailwater of trunk line #1 depending on the placement of the detention basin within the vacant parcel identified. Trunk line #1 has an approximate length of 2,950 feet. Please note the true placement of trunk line #1’s headwater is flexible and will depend on stakeholder engagement and available funding sources during the design phase. It is currently proposed that segments along Nancy Rose Street – but north of Victoria Street – would entail improved roadside ditches on both sides of Nancy Rose Street to provide comparable drainage capacity before tying into the proposed RCBs. Flood relief at the community-level assumes future roadside ditch improvements for lateral street connections intersecting with trunk line #1 for improving sheet flow collection and drainage efficiency. A rough approximation of this level of roadside ditch drainage improvement detail has been included in these planning-level cost estimates. The proposed detention basin will provide approximately 109 acre-feet of potential storage for mitigating conveyance impacts from Cloverleaf drainage improvements. Preliminary analysis of this proposed basin assumes a partial right-of-way (ROW) acquisition of approximately 15.8 acres and a pond depth of approximately 10 feet. The detention ROW entails acquisition of already vacant lots (based on aerial imagery and site visits). There is also potential for expanding the basin capacity to include the full buyout of the parcel with an additional ROW acquisition of 1.8 acres of the existing 17.6-acre parcel, yielding a maximum potential storage capacity of 125 acre-feet for the proposed basin. The basin will be equipped with the necessary gravity-driven outlet structure for tying into the existing outfall.

II. COST ESTIMATE:

The Total Estimated Cost of this proposed project is $14,532,952.26. $10,000,000.00 of this cost will be funded by a CDBG‐MIT Grant. The remaining $4,532,952.26 will be funded by HCFCD. See the attached “CDBG-MIT: Budget Justification of Retail Costs (Former Table 2)" for a detailed breakdown of the estimate construction cost.

III. CDBG NATIONAL OBJECTIVE

Principally Benefit Low-and-Moderate-Income (LMI) Persons

IV. ATTACHMENTS CDBG-MIT: Budget Justification of Retail Cost (Former Table 2) Project Area Map Project Beneficiary Map

Applicant/Subrecipient:

Site/Activity Title:

Eligible Activity:

Materials/Facilities/Services $/Unit Unit Quantity Construction Acquisition Total

Detention Basin

Clearing, Grubbing, and Disposal 1.27$ SY 77440 98,348.80$ -$ 98,348.80$

Excavation (Off-Site Haul) 18.00$ CY 213893 3,850,077.33$ -$ 3,850,077.33$

Concrete Pilot Channels 55.00$ SY 4225 232,393.33$ -$ 232,393.33$

Turf Establishment (Sodding / Seeding) 0.77$ SY 62920 48,448.40$ -$ 48,448.40$

Backslope Swale 5.00$ LF 3410 17,050.00$ 17,050.00$

Backslope Drain Structure 3,500.00$ EA 10 35,000.00$ -$ 35,000.00$

Backslope Interceptor Rip-rap 80.00$ SY 100 8,000.00$ -$ 8,000.00$

Site Preparation

Clearing and Grubbing (Trunk line #1) 1.34$ SY 6776 9,079.84$ -$ 9,079.84$

Earthwork

Excavation and Disposal Trunk Line #1 18$ CY 16394 295,100.00$ -$ 295,100.00$

Storm Sewer

9x7 RCB Trunk Line #1 850.00$ LF 2951 2,508,350.00$ -$ 2,508,350.00$

Pavement Removal 10.00$ SY 6558 65,577.78$ -$ 65,577.78$

Concrete Pavement Replacement 75.00$ SY 6558 491,833.33$ -$ 491,833.33$

Subbase Replacement 8.00$ SY 7214 57,708.44$ -$ 57,708.44$

Regrade Roadside Ditch (Gainesville St) 12.00$ LF 6780 81,360.00$ 81,360.00$

Regrade Roadside Ditch (Longview St) 12.00$ LF 6760 81,120.00$ 81,120.00$

Regrade Roadside Ditch (Texarkana St) 12.00$ LF 6760 81,120.00$ 81,120.00$

Regrade Roadside Ditch (Eagle Pass St) 12.00$ LF 6760 81,120.00$ 81,120.00$

Regrade Roadside Ditch (Victoria St) 12.00$ LF 6660 79,920.00$ 79,920.00$

Regrade Roadside Ditch (Corpus Christi St) 12.00$ LF 6740 80,880.00$ 80,880.00$

Regrade Roadside Ditch (Brownsville St) 12.00$ LF 6700 80,400.00$ 80,400.00$

Regrade Roadside Ditch (Laredo St) 12.00$ LF 6700 80,400.00$ 80,400.00$

Regrade Roadside Ditch (Hillsboro St) 12.00$ LF 4020 48,240.00$ 48,240.00$

Regrade Roadside Ditch (Waxahachie St) 12.00$ LF 6700 80,400.00$ 80,400.00$

Regrade Roadside Ditch (Nancy Rose St) 12.00$ LF 4000 48,000.00$ 48,000.00$

Regrade Roadside Ditch (Manor St) 12.00$ LF 5920 71,040.00$ 71,040.00$

Regrade Roadside Ditch (Barbara Mae St) 12.00$ LF 5880 70,560.00$ 70,560.00$

Regrade Roadside Ditch (Cloverleaf St) 12.00$ LF 5900 70,800.00$ 70,800.00$

Total Construction Costs 8,752,327.26$ 8,752,327.26$

Land Market Value Mutiplier Costs

Total ROW acquisition cost 2,312,250.00$ 2.5 5,780,625.00$ 5,780,625.00$

TOTAL 14,532,952.26$ 14,532,952.26$

Date: 9/25/2020Phone Number: 361-542-1027

CDBG-MIT: Budget Justification of Retail Costs

(Former Table 2)

Cost Verification Controls must be in place to assure that construction costs are reasonable and consistent with market costs at the time and place of construction.

1. Identify and explain the annual projected operation and maintenance costs associated with the proposed activities.

2. Identify and explain any special engineering activities.

Seal

Signature of Registered Engineer/Architect Responsible

For Budget Justification:

Harris County Community Services Department (on behalf of Harris County Flood Control District)

Cloverleaf Stormwater Detention Basin

Flood control and drainage improvements

This project along with all HCFCD CDBG-MIT projects will be included in the Annual Operational and Maintenance Budget prepared and funded by the HCFCD. All cost associated

with the successful maintenance and operation of this project as well as all other projects under the responsibility of HCFCD are included in this budget.

Firm Torres & Associates, LLCFirm ID: 20741

Date 9/25/2020

ATTACHMENT 1

PROJECT AREA MAP

oCreated: 10/1/2020

0 0.1 0.20.05

MilesExhibit 01WP01 ComputedFlood Metrics

Watershed PlanCarpenters Bayou

LegendProject Area BoundaryStudy StreamCarpenters Bayou

Area of Inundation1

1 Computed from 100 year sheetflow model

PROJECT BENEFICIARY MAP

Block Group 1Census Tract # 252500

Block Group 1

Census Tract # 252301































oCreated: 9/30/2020

0 0.2 0.40.1

MilesExhibit 04LMI by Census Block

Watershed Plan

Carpenters Bayou

Legend

Project Area Boundary

LMI - Census Block Group

Below 25%

25% - 50%

50% - 75%

Above 75%

Study Stream

Carpenters Boundary

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