Project:	Date:

Cover Sheet

Firms Name

Title

Prepared By

Date

Engineering Seal

Index

Drainage Report Narrative Write-up

Engineering Seal

Project Location description (City/ETJ)

Flood Plain (FEMA info)

Soil Conditions: Map symbol, Soil Name, Group and Unified Class

Existing Conditions

Pre-Development 10-Yr CFS

Flow Direction & Outfall Location

Proposed Conditions

Proposed Use

After Development 50-Yr CFS

or as required by municipality

Increase Q (CFS) rate

Detention volume (cf and Ac-ft)

Outfall location and owner

Project Location map

USGS Topographical Map w/ runoff pattern

Hydraulic Calculations

Title

Hydraulic Calculation

Engineering Seal

“C” Values for Method

Rainfall Intensity for Hidalgo County

Flood Plain

Community Panel

Site Location on FIRM Map

Flood Zone

Zone Description

Soil Survey

Properties of Soil

Site location on Soil Survey

Set of Plans

Proposed Plat in clear pdf

Drainage Design in clear pdf

Extending 500’ from site, with 1’ contours

Drainage Area Map w/ Pipe Calculations

Hidalgo County Drainage District No. 1 drainage requirements: All drainage systems will require an outfall (No Retention Ponds Allowed) Drainage systems, include inlets, pipes, outfalls, etc. to be sized as per calculations Drainage outfalls to be a minimum of 24 inches. Storm systems discharging into non-HCDD No. 1 ditches are to meet outfall choke and/or permit requirements Drainage system and detention ponds are to be installed during platting process (No longer allowing postponement of detention system for building permit/construction phase) Sites located in Flood zones and within City limits will require Base Flood Elevation (BFE) to be noted in the report and acknowledging from the City that the subdivision will not require a LOMR-F for the entire subdivision. Sites located in low-lying areas and outside of City limits will require Base Flood Elevation (BFE), Letter of Map Amendment (LOMA) or Letter of Map Revision (LOMR), and an Engineering Impact study. If adjacent to a ditch, Right-of-way dedication will be required either 75’ from the center of the existing ditch or 75’ from the property line whichever is greater. HCDD No. 1 Voluntary Annexation Petition Packet for development of sites on Planned Service Area

Review Notes: