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Meeting Date:	05/29/2018
Hydraulic Model Engineering Contract with Porras Nance Amendment No. 1
Submitted for:	Adrian Montemayor	Submitted By:	Adrian Montemayor
Department:	Water Utilities

Subject:

Discussion with possible action to authorize the Purchasing Agent to solicit Requests for Qualifications for engineering and surveying services for Rio Bravo and El Cenizo water distribution system in order to provide GPS field surveys of all locatable valves and fire hydrants to update both water system maps in to GIS format for County mapping records. [Account #7220-7280-001-432001, 2016 Bond Series, Professional Services]

Issue: Existing previous contract awarded for completion of a hydraulic model for identification of improvements needed to place elevated storage tank back into service as required under administrative order with TCEQ. This project is complete but has exposed additional design improvements needed for compliance. Obtaining grid coordinates for the water infrastructure was left out for later consideration to address current violation. We would like to now complete the GIS surveying to assure our mapping system is accurate under County database configurations.

Solution: Obtain engineering qualifications for providing the necessary engineering services.

Result: Accurate GIS map and hydraulic database for current operation and future improvements.

Background:

All points will be tied to the NAD 83, Texas State Plan, 4205 South Zone, NAVD 88 (grid coordinates) by GPS equipment to match the County's GIS database. The collected data will be forwarded to your office in a GIS forma and AutoCAD points file. The GIS maps of the water distribution system developed with hydraulic model will be updated to show color-coded valve, hydrant and man locations based on the survey. Existing bse maps show roughly 330 valves and 170 hydrants (500 total points).

Previous Court Action:

6/26/2017: Discussion with possible action to award a contract in the amount of $48,000 to Porras and Nance Engineering to complete a Hydraulic Model and distribution system mapping system for El Cenizo and Rio Bravo. [Account #7220-7280-001-432001; 2016 Bond Series, Professional Services]

Fiscal Impact

Budget Account Number:	7220-7080-001-432001
Funding Source:	2016 Bond Series
Balance:	NA
Financial Impact:
2016 Bond Series, Water Professional Services